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Logo of jpnSubmit a ManuscriptEmail AlertsAbout JPNJournal of Psychiatry and Neuroscience
 
J Psychiatry Neurosci. May 2011; 36(3): 165–175.
PMCID: PMC3080512
Effect of executive functioning, decision-making and self-reported impulsivity on the treatment outcome of pathologic gambling
Eva M. Álvarez-Moya, PhD, Cristian Ochoa, BS, Susana Jiménez-Murcia, PhD, Maria Neus Aymamí, BS, Mónica Gómez-Peña, BS, Fernando Fernández-Aranda, PhD, Juanjo Santamaría, BS, Laura Moragas, BS, Francesca Bove, BS, and José M. Menchón, MD
Álvarez-Moya, Jiménez-Murcia, Fernández-Aranda — CIBER Fisiopatología de la Obesidad y Nutrición (CIBERObn), Instituto de Salud Carlos III, Spain; Álvarez-Moya, Jiménez-Murcia, Aymamí, Gómez-Peña, Fernández-Aranda, Santamaría, Moragas, Bove, Menchón — Department of Psychiatry, University Hospital of Bellvitge, Barcelona, Spain; Ochoa —Department of Psychiatry and Clinical Psychobiology, University of Barcelona, Spain; Menchón — CIBER Mental Health (CIBERSAM), Instituto Salud Carlos III, Spain
Correspondence to: Dr. E.M. Álvarez-Moya, CIBERObn and Department of Psychiatry, University Hospital of Bellvitge, c/Feixa Llarga, s/n, 08907, L’Hospitalet de Llobregat, Barcelona, Spain; eva.alvarez/at/uab.cat
Received August 4, 2009; Revised April 23, 2010; Revised July 3, 2010; Accepted July 6, 2010.
Background
Impairments in self-regulatory behaviour reflect a deficit in executive functioning and decision-making, as well as higher levels of self-reported impulsivity, and may be involved in the development and maintenance of addictive disorders. We sought to explore the association between self-reported impulsivity and neurocognitive measures, and their association with treatment outcome in pathologic gambling.
Methods
We assessed patients with pathologic gambling using executive functioning and decision-making tests and self-report measures of impulsivity. Patients underwent cognitive–behavioural therapy (CBT) for pathologic gambling.
Results
We included 88 patients (8% women) in our study. High self-reported extravagance was associated with poor performance in the Iowa Gambling Task (IGT)-ABCD version. High impulsiveness, low disorderliness, high exploratory excitability (trend), poor backward block span and poor IGT-EFGH scores (trend) predicted dropout. We observed no self-reported or neurocognitive predictors of relapse or number of treatment sessions attended.
Limitations
Most participants were slot-machine gamblers seeking treatment. No follow-up data and no control group were included in the study. The missing sample (i.e., individuals who were recruited and assessed in the pretreatment stage but who chose not to begin treatment) had higher extravagance scores than the final sample.
Conclusion
Neurocognitive reward sensitivity was related to self-reported overspending behaviour. Self-regulatory impairments (especially rash impulsiveness and punishment sensitivity) and executive dysfunction predicted only dropout of CBT in participants with pathologic gambling. Different neurocognitive processes and personality traits might mediate treatment response to psychological therapy of pathologic gambling according to the specific target variable assessed.
Impairments in self-regulatory behaviour seem to be involved in the development and maintenance of pathologic gambling and other addictive disorders.1,2 From a neuropsychological point of view, this impairment reflects a deficit in executive functioning and decision-making.3,4
Executive functioning includes functions such as cognitive flexibility (set-shifting), which is associated with orbitofrontal functioning, and working memory, planning and abstract thinking, which are associated with dorsolateral prefrontal functioning.57 However, decision-making seems to be mainly associated with activation of the ventromedial prefrontal cortex.5,8 People with pathologic gambling have shown impaired performance in tasks measuring both concepts. Specifically, studies report deficits in cognitive inhibition, complex executive functions and attention.911 This population also shows impairments in decision-making.1214 Decision-making impairments are observed in impulsive individuals in general. Specifically, impulsive individuals show an insensitivity to variations in reward/loss magnitude of behavioural decision-making tasks.15,16 Sensitivity to reward has been the most studied aspect of decision-making. However, decision-making is also guided by sensitivity to punishment,17 which has received little attention in pathologic gambling, especially from a neurocognitive perspective.
Self-regulatory deficits may also manifest in certain personality traits such as impulsivity. Considering its multidimensionality, at least 2 types of impulsivity have been postulated: rash impulsiveness (acting rashly when distressed) and sensitivity to reward (greater response/activation to rewarding stimuli). The latter is based on Gray’s Behavioural Approach System.18 In the field of substance dependence, some authors consider rash impulsiveness to be a risk factor for uninhibited behaviour and for the progression from substance use to substance dependence, whereas sensitivity to reward is considered to be associated more with motivation to use substances than with substance dependence.19,20 However, there is confusion regarding some impulsivity-related terms that are not clearly classified into the previous 2-factor hypothesis. For instance, sensation-seeking (similar to novelty-seeking), which has been defined as a need for varied, novel and stimulating experiences,21 has been associated with heightened sensitivity to the rewarding effects of drugs.22,23 Sensation-seeking has also been associated with reward-seeking in animal studies,24 and it seems to be independent of rash impulsiveness.25 However, many studies of pathologic gambling use the terms impulsiveness and sensation-seeking indistinctly, and most of them report high levels of both traits in this population.2628 Rash impulsiveness would represent a failure to inhibit a behaviour that may result in negative consequences, lack of reflection and planning, rapid decision-making and action and carelessness.29,30 Given the definition of both concepts (rash impulsiveness and sensation-seeking), sensation-seekers are not necessarily careless or nonreflective. As such, we should expect a stronger association between sensation-seeking and sensitivity to reward than sensation-seeking and rash impulsiveness.
The novelty-seeking factor of the Temperament and Character Inventory-Revised31 tool is considered to be a general measure of impulsivity. However, its different subscales seem to measure different components of this construct. Exploratory excitability (reflecting sensation-seeking) and extravagance (reflecting overspending behaviour and poor planning) have been related to polymorphisms in the dopamine (DA) D4 receptor (DRD4).32 These traits have been considered to represent the exploratory, extravagant and extroverted subtypes of the novelty-seeking factor. Conversely, the impulsive and monotony-avoiding subtypes would be represented by the impulsiveness (representing unreflective and careless behaviour) and the disorderliness (reflecting disorganized, uncontrolled, antinormative behaviour) subscales.32 The literature about the relation between Cloninger’s novelty-seeking subscales and the different components of impulsivity is scarce.33,34 Nevertheless, considering these findings in the framework of the previously mentioned 2-factor hypothesis, we may expect an association of exploratory excitability and extravagance with sensitivity to reward on the one hand, and impulsiveness and disorderliness with rash impulsiveness on the other. The distinction between these concepts and their association with self-regulatory deficits in pathologic gambling is understudied. Further, relatively few studies appear to have examined the relations between these traits and treatment outcome.
In spite of the importance of impulsivity in the generation and maintenance of pathologic gambling, the link between neuropsychological and personality (self-report) measures of impulsivity (as a whole) is relatively unexplored in the field of pathologic gambling. In addition, only 1 study has focused on the association of neuropsychological and personality measures of impulsivity with treatment outcome in pathologic gambling. Goudriaan and colleagues35 examined the effect of neuropsychological functions (disinhibition, perseveration for reward, cognitive flexibility, decision-making) and self-report measures of impulsivity and sensitivity to punishment on vulnerability to relapse after psychological treatment for pathologic gambling. They found that only disinhibition and perseveration for reward (as measured by neuropsychological tasks) were predictive of relapse at 1-year follow-up after treatment. No other neuropsychological predictors were identified, and no self-report measure was predictive of relapse. They concluded that neuropsychological measures, particularly disinhibition and perseveration for reward, are more powerful predictors of treatment outcome than personality measures. In this regard, Forbush and colleagues36 explored the predictive power of neuropsychological (general intellectual functioning, executive functioning, decision-making) versus personality (general personality and impulsivity) measures in a group with diagnosed pathologic gambling compared with healthy controls. They generated 2 neuropsychological factors and 2 personality factors (by factor analysis of the different measures) and used these converted variables as explanatory variables. In contrast to Goudriaan and colleagues,35 Forbush and colleagues36 found that personality measures were better predictors of a pathologic gambling diagnosis than neuropsychological functions. Both research groups used different outcome measures, but to our knowledge, only these 2 studies have addressed the specific role of neuropsychological and personality measures in pathologic gambling.
Differentiating the specific role of every measure may help clarify the mechanisms underlying problem gambling behaviour. Adinoff and colleagues37 concluded that the different behavioural manifestations of impulsivity may correspond to different neurocognitive constructs with specific neuroanatomical correlates. Then, impulsivity should be described not only in terms of phenotypes (as measured by self-report tests) but also from an endophenotypic/neuropsychological point of view. These authors recommend the study of the relation between impulsive behaviours, neurobiological impairments and risk of relapse in addictive disorders. Llewellyn38 also highlighted the importance of exploring the relation between neuropsychological measures of risk-related decision-making and personality traits.
In sum, very little research about the link between neurocognitive (endophenotypical) and self-report (exophenotypical) measures of both impulsivity and self-regulatory deficits has been done, particularly in the area of pathologic gambling. Second, the association between these constructs and treatment outcome in pathologic gambling has received little attention. In this context, we aimed to determine the relations between self-reported impulsivity, neurocognitive functions (executive functioning and decision-making, including both reward and punishment sensitivity) and treatment outcome (including both relapse and dropout) in pathologic gambling. Our specific objectives were, first, to establish the pattern of associations between neurocognitive variables and self-report (personality) measures of impulsivity in pathologic gambling and, second, to determine the predictive power of neuropsychological and personality measures in relation to relapse and dropout during psychological treatment for pathologic gambling.
Participants
We recruited consecutive patients seeking treatment for pathologic gambling in a Pathological Gambling Unit (Department Psychiatry, University Hospital of Bellvitge, Barcelona, Spain) for participation in our study. Pathologic gambling was diagnosed according to DSM-IV-TR criteria.39 Entry into the study was from November 2005 to September 2007. Exclusion criteria at intake were age younger than 18 or older than 65 years, history of neurologic disorder or head injury, psychotic disorder and history of substance abuse in the previous 3 months. Substance abuse was measured with the substance use disorders module of the Structured Clinical Interview for DSM-IV Axis I Disorders.40 We assessed patients with the South Oaks Gambling Screen (SOGS).41
This study was carried out according to the latest version of the Declaration of Helsinki. The University Hospital of Bellvitge Ethics Committee of Clinical Research approved this study, and we obtained informed consent from all final participants.
Instruments and measures
Self-report measure of impulsivity
Novelty-seeking is 1 of 4 temperamental factors measured by the Temperament and Character Inventory-Revised (TCI-R) tool.31 It reflects several forms of impulsivity,31 and its reliability (internal consistency) was 0.77 (Cronbach’s α) in the Spanish adaptation of the TCI-R.42 Given our interest in the different aspects of impulsivity, rather than the total score, we focused on the 4 novelty-seeking subscales: exploratory excitability (NS1), impulsiveness (NS2), extravagance (NS3) and disorderliness (NS4). The NS2, NS3 and NS4 subscales showed low intercorrelations (all below 0.4) in our sample, and NS1 (exploratory excitability) was completely independent of the other 3 subscales.
Neurocognitive measures
The Wisconsin Card Sorting Test (WCST)43 is considered to be sensitive to frontal lobe dysfunction. It measures strategic planning, organized searching, using environmental feedback to shift cognitive sets, directing behaviour toward achieving a goal and modulating impulsive responding. The materials consist of 2 decks of 64 cards that are numbered from 1 to 64 on the lower left corner of the reverse side to ensure a standard order of presentation. The participant must sort response cards to 4 key cards according to colour, form or number (categories) and alter their approach as shifts in the sorting principle occur. The examiner gives only feedback of “correct” or “incorrect” on every trial. The test finishes when the examinee completes either 6 categories or 128 trials. The WCST provides objective scores for overall success and for specific sources of difficulty in the task such as perseveration or conceptualization. For the present study, we used the number of completed categories and the percentage of perseverative and nonperseverative errors.
The Stroop Colour and Word Test44 measures cognitive flexibility, involuntary attention, ability to override a prepotent response (reading a lexical stimulus) and concentration effectiveness.45 It consists of a word page (first list) with colour words printed in black ink, a colour page (second list) with “Xs” printed in colour and a colour–word page (third list) with names of colors printed in an incongruent colour. The examinee must read words (first list) or name ink colour (second and third lists) as quickly as possible within a time limit (45 s). The test yields 3 scores based on the number of items correctly completed on each of the 3 stimulus sheets, i.e., number of read words in first list (W), number of colour-named items in second list (C) and number of colour-named words in third list (CW). In addition, Golden44 proposed an interference score, which is useful in determining the individual’s cognitive flexibility, creativity and reaction to cognitive pressures. This score is computed according to the following formula: #CW − ([#W × #C] ÷ [#W + #C]). Higher scores in this index suggest better cognitive inhibition (better interference control).
The Trail Making Test, parts A and B (TMT),46 is an easily administered test of visual conceptual and visuomotor tracking involving motor speed, attention and the ability to alternate between cognitive categories (set-shifting). This test consists of 2 parts. Part A is a page with 25 numbered circles randomly arranged. Participants are instructed to draw lines between the circles in increasing sequential order until they reach the circle labelled “end.” Part B is a page with circles containing the letters A through L and 13 numbered circles intermixed and randomly arranged. Participants are instructed to connect the circles by drawing lines alternating between numbers and letters in sequential order, until they reach the circle labelled “end.” If individuals make mistakes, the mistakes are quickly brought to their attention, and they continue from the last correct circle. The test takes about 5–10 minutes to complete. Scores are the amount of time taken to complete each part. To control for individual differences in motor speed, we generated a score based on the subtraction of time to complete part A from time to complete part B. Higher scores suggested set-shifting difficulties.
The Iowa Gambling Task (IGT), versions ABCD and EFGH,17 is a computerized test measuring sensitivity to reward (i.e., to what extent large immediate gain outweighs even larger future loss; ABCD version) and sensitivity to punishment (i.e., to what extent immediate punishment outweighs high reward; EFGH version). It seems that patients with ventromedial prefrontal lesions perform poorly on both versions.17 Participants receive standard instructions and are informed that the aim of the game is to win as much money as possible. In the ABCD version, 4 decks of cards are presented on the computer screen. The participant has to pick cards after which the amount of money the participant has won or lost is depicted on the computer screen. Winning or losing money is indicated by a green bar that increases or decreases. The game consists of 100 trials. The ABCD version is focused on rewards. Decks A and B are associated with great immediate reward but even greater future punishment. These are known as the disadvantageous decks. Decks C and D give lesser rewards but also lesser losses, so they result in a net gain in the long run. The layout and structure of the EFGH version is very similar. Instructions are the same, but this version is focused on punishment. Decks E and G are associated with great immediate punishment but even greater future reward. Decks F and H are associated with lesser punishments but also much lesser rewards, so they are the disadvantageous decks. Information about advantageous/disadvantageous decks is not given to the participant; they have to infer this information based on feedback. The 100 trials of each version are divided into 5 equal blocks. The final score reflects the number of cards selected from advantageous decks minus disadvantageous decks for each block (ABCD version: [C+D] − [A+B]; EFGH version: [E+G] − [F+H]). We counterbalanced the order of administration of both versions, which were also administered in different sessions.
The Controlled Oral Word Association Test47 is also known as the FAS test of verbal fluency in reference to the letters F-A-S, which are used for word generation. Its purpose is the spontaneous production of words beginning with a given letter or of a given class within a limited amount of time (verbal association fluency). It measures the individual’s ability to spontaneously produce words pertaining to a specific phonemic category. This test presumably reflects both preservation of word knowledge and ability to self-initiate verbal output48 (i.e., executive functioning). The participant is asked to produce as many words as possible beginning with a given letter in 1 minute. Proper nouns, repetitions and variations are inadmissible. In Spanish, the letters P-M-R are used instead of F-A-S.49 The score is the sum of all admissible words for the 3 letters.
The Backward Digits Span task50 of the Wechsler Memory Scale, third edition, requires the examiner to verbally present digits at a rate of 1 per second. The participant is asked to repeat the list of digits after the examiner has completed delivering it. The forward test requires the participant to repeat the digits verbatim. The backward test requires the participant to repeat the digits in reverse order. The number of digits increases by 1 until the participant consecutively fails 2 trials of the same digit span length. Performance on the backward digit span task measures verbal working memory by requiring internal manipulation of mnemonic representations of verbal information in the absence of external cues.51 Given our focus on executive functions, we used the digit span length in the backward version (backward digits span [BDS]).
The Corsi blocks task52 apparatus consists of a set of 9 identical blocks irregularly positioned on a plastic board. The experimenter points to a series of blocks at a rate of 1 block per second. Subsequently, the participant is required to point to the same blocks in their order of presentation (forward) or in the reversed order (backward). The length of the block sequences increases until recall is no longer correct. The Corsi blocks task involves visuospatial and executive resources by requiring backward recall of the path presentations in the task. Upon presentation of a series of block positions, a representation of the path is constructed and maintained in visuospatial working memory. If the sequence has to be reproduced in reverse order, executive control is required.53 For the present study, we analyzed the blocks span in the backward version (backward blocks span [BBS]).
Treatment outcome
Dropout
Milton and colleagues54 and Robson and Edwards55 defined dropout as terminating treatment before completing the predetermined treatment program (see below) that was administered. This was coded as a binary variable (dropout/ nondropout). We used the number of treatment sessions attended to analyze dropout from a continuous perspective.
Relapse
Ledgerwood and Petry56 defined relapse as the presence of any episode of gambling during treatment associated with a subjective sense of loss of control over gambling. This variable was quantified for all patients who started treatment (including those who dropped out during treatment). Relapse was coded as a binary variable (relapse/nonrelapse) and continuously (number of relapses during treatment).
Procedures
We first assessed patients with a semistructured face-to-face interview as part of the usual protocol in our unit. This interview includes the assessment of substance abuse/ dependence and is usually performed by psychologists or psychiatrists (minimum 10 yr of specialization in pathologic gambling). Exclusion criteria for the current study were identified at this time. The patients who agreed to participate in the study provided written, informed consent after receiving written and oral explanation of the procedures.
Patients completed the TCI-R during a second session. The neurocognitive assessment was then administered by an experienced neuropsychologist during 2 sessions of 45 minutes’ duration before starting treatment. We also administered the Wechsler Adult Intelligence Scale, third edition (WAIS-III)57 vocabulary subtest as a measure of estimated intelligence.45
Treatment consisted of a cognitive–behavioural outpatient group therapy (CBT) based on a standardized protocol.58 It consisted of 16 weekly outpatient sessions (90 min each) with a total of 10–14 patients per group. The main objective of the treatment was training patients to put into practice CBT strategies to achieve full and definitive abstinence from gambling. Techniques used were psychoeducation on the disorder, stimulus control, response prevention, cognitive restructuring, reinforcement and self-reinforcement, skills training and relapse prevention techniques. The therapist recorded dropouts and relapses based on patients’ oral reports and written diaries and relatives’ confirmation.
Statistical analysis
We performed all statistical analyses with SPSS version 15.0.1 for Windows. We compared background characteristics (age, education, WAIS-III vocabulary score, duration of gambling problem and SOGS total score, sex, marital status, employment, use of medication) of patients who dropped out versus those who did not, and individuals who relapsed versus those who did not, using analysis of variance (ANOVA) for quantitative variables and the χ2 test for qualitative variables.
The association between self-report measures of impulsivity (TCI-R novelty-seeking subscales) and neurocognitive measures of decision-making and executive functioning was assessed through linear regression models. Considering the natural direction of the relation between endophenotypes and external phenotypes, we used neurocognitive and decision-making measures as independent explanatory variables, and TCI-R novelty-seeking subscales were used as dependent variables. We generated 4 models (1 for each sub-scale) by entering all independent variables in 1 block. All 4 models were adjusted for age, sex and score in the WAIS-III vocabulary subtest (entered in block 2).
We measured the association between neurocognitive, decision-making and self-report measures on the one hand and treatment outcome on the other through logistic and linear regression models. We assessed 4 models: 2 logistic regression models for categorically coded dropout and relapse and 2 linear regression models for number of treatment sessions attended and number of relapses, respectively. The independent measures were entered as a block to explore the relative contribution of each predictor to treatment outcome.
Patients
We assessed a total of 115 patients, but 27 (23.5%) rejected starting treatment. The final sample consisted of 88 patients with pathologic gambling (8% were women), with a mean age of 36.7 years (standard devision [SD] 11.1 yr). The mean score on the SOGS41 was 10.3 (SD 2.7). The patients had a mean of 10.7 (SD 3.2) years of education, 83.5% were employed, 52.9% were married, 34.1% were single and the remaining 13% were separated or divorced. Most participants (91.7%) were mainly slot-machine gamblers and 23.1% had several gambling problems, including slot machines, bingo, casino, lotteries and cards. The mean duration of the gambling problem was 5.6 (SD 5.7) years. Only 17.4% of patients were taking psychiatric medication, primarily antidepressants: 75.0% selective serotonin reuptake inhibitors (SSRIs) and 37.5% benzodiazepines.
In relation to patients who started treatment, Student t tests revealed that those who rejected treatment exhibited higher levels of TCI-R extravagance (NS3; t90.9 = 5.0, p < 0.001) and a slightly higher percentage of nonperseverative errors in the WCST (t108 = 2.0, p = 0.048).
The treatment outcome groups were as follows: 45 patients showed no dropout or relapse, 12 patients had a relapse, 20 patients had dropout and 7 patients showed both relapse and dropout during treatment (we missed information about relapse from 4 patients who had dropouts). Table 1 shows the main sociodemographic and clinical characteristics per group. We identified no statistically significant group differences in any of the variables presented in Table 1.
Table 1
Table 1
Sociodemographic and clinical characteristics of the treatment outcome groups of patients with pathologic gambling
Relation between self-report measures of impulsivity and neurocognitive measures
Table 2 shows the result of bivariate correlations between self-report and neurocognitive measures. Although several correlations were significant at a 0.05 level, no statistically significant correlations were observed after Bonferroni correction, which was set up at a 0.001 level.
Table 2
Table 2
Pearson product-moment correlations between self-report (TCI-R novelty-seeking subscales) and neurocognitive measures
Regarding the association analysis, only the adjusted model for the NS3 subscale (extravagance) was statistically significant ( F13,67 = 2.26, p = 0.015). Specifically, the IGT-ABCD net score was negatively associated with the NS3 score (B = −0.057, standard error = 0.026, β = −0.245, t = −2.17, p = 0.033). No other neurocognitive index was statistically associated with the NS3 score. No other model was statistically significant (NS1, p = 0.27; NS2, p = 0.13; NS4, p = 0.37). These results remained after excluding medicated patients from the sample.
Effect of neurocognitive and self-report measures on treatment outcome
Table 3 shows means and standard deviations of personality and neurocognitive measures according to the presence of dropout or relapse.
Table 3
Table 3
Personality (TCI-R novelty-seeking subscales) and neurocognitive measures according to dropout and relapse
Dropout
The result of the logistic regression analysis for dropouts is shown in Table 4. Dropout during treatment was significantly predicted by high NS2 (impulsiveness) and low NS4 (disorderliness) scores, as well as lower number of blocks recalled at the BBS. High NS1 (exploratory excitability) and lower number of advantageous choices in the IGT-EFGH predicted dropouts at a trend level. The model was statistically significant (χ214 = 34.71, p = 0.002) and explained a moderate to high percentage of variance in dropouts (Nagelkerke R2 = 0.647). No differences in these results were observed after adjustment for age and sex. The exclusion of medicated patients yielded the same pattern of effects, but the TCI-R NS4 subscale lost statistical significance (p = 0.19).
Table 4
Table 4
Logistic regression analysis for dropouts (enter method)
Regarding the linear regression analysis for number of treatment sessions attended, the model was not statistically significant (F14,23 = 1.165, p = 0.36). This result remained after excluding medicated patients from the analysis.
Relapse
The logistic regression model for relapse did not achieve statistical significance (χ214 = 14.21, p = 0.43). The linear regression model for number of relapses also failed to achieve statistical significance (F14,14 = 0.847, p = 0.62). These results remained after we excluded medicated patients from the analyses.
The present study focused on the relations between neurocognitive measures (executive functioning and decision-making), self-report measures of impulsivity and treatment outcome in pathologic gambling.
Relation between self-report measures of impulsivity and neurocognitive measures
We observed that individuals with pathologic gambling who had high levels of TCI-R novelty-seeking extravagance (i.e., unwary, overspending individuals who were outrageous in relation to money, energy and feelings) showed higher sensitivity to reward. Other authors have also found a relation between some aspects of impulsivity and sensitivity to reward, as measured by the IGT.5961 We can conclude from these studies that particularly poor planning is associated with high sensitivity to reward. High scores in the TCI-R novelty-seeking extravagance subscale indicate lack of both caution and farsighted behaviour, which can be related to poor planning abilities. Our results add support to the literature in this regard. We can hypothesize that the extravagance subscale is the most related to cognitive impulsivity or reward-discounting (i.e., the preference for smaller, immediate rewards over larger, delayed rewards), which is associated with IGT-ABCD performance.62 High scores in the TCI-R novelty-seeking extravagance subscale have also been related to low baseline cerebral availability of the type 1 cannabinoid receptor (CB1R) in healthy volunteers,63 hypercortisolemia in depressed patients64 and a higher level of tobacco dependence.65
Unlike other studies,16,66 we found no association between other aspects of self-reported impulsivity, such as novelty-seeking impulsiveness and exploratory excitability, and neurocognitive measures. We must take into account that the studies measuring the association between impulsivity (as a whole) and neurocognition use different samples and instruments to assess these concepts, so the comparison across studies may be difficult. In fact, we know of no studies assessing the relation between the TCI-R novelty-seeking subscales and neurocognitive function. Even so, other investigations have also failed to find associations between sensation-seeking (represented by exploratory excitability in the present study) and decision-making in other samples with addictive behaviours such as cigarette smokers67 or undergraduate students.59 In the same line, Zermatten and colleagues59 assessed the relation between the UPPS Impulsive Behaviour Scale68 (measuring urgency, premeditation, perseverance and sensation-seeking) and the IGT-ABCD in undergraduate students, and they only found an association between lack of premeditation (which would be close to the novelty-seeking extravagance subscale) and poor decision-making.
Effect of neurocognitive and self-report measures on treatment outcome
Relapse
In contrast to the study by Goudriaan and colleagues,35 who found that neurocognitive measures, more than self-report measures, were the most predictive of relapse in pathologic gambling, no self-report measure of impulsivity or neurocognitive measures were predictive of relapse (both from a categorical or a continuous approach) in the present study. This finding suggests that self-reported impulsivity, executive functioning and decision-making do not mediate relapse during treatment in pathologic gambling, so other factors, such as other personality traits, psychopathological status and motivation at the beginning and during treatment, should be explored.
In addition, contrary to what should be expected, some statistically nonsignificant trends (Table 3) suggested that those who relapsed during treatment tended to have better cognitive inhibition and lower perseverative tendencies. This means that relapse during treatment could not be attributed to poor neurocognitive performance. These are preliminary and non-significant results that need corroboration in future studies.
The lack of agreement between the present results and those of Goudriaan and colleagues may reflect the use of different self-report measures in both studies, as well as the fact that Goudriaan and colleagues measured relapse at 1-year follow-up, whereas in the present study this measure was taken during treatment. This might suggest that the processes controlling vulnerability to relapse are different during treatment and follow-up. Whereas risk of relapse would not be related to self-reported impulsivity or neurocognitive function during treatment, the long-term maintenance of abstinence would require the intervention of neurocognitive/ endophenotypical markers, such as perseveration for reward and disinhibition.
Finally, we should consider that sample-specific factors such as a small sample size or the main presence of slot-machine gamblers may have masked the present results.
Dropout
We found that dropout during treatment (from a categorical point of view) was predicted by both self-report measures and neurocognitive variables. High TCI-R impulsiveness was predictive of dropouts. High TCI-R exploratory excitability also predicted dropout at a trend level. These results suggest that especially rash impulsiveness and, to a lesser degree, sensation-seeking are involved in risk for dropout in pathologic gambling, whereas no impulsivity trait has an influence on relapse. In addition, low TCI-R disorderliness (i.e., strict regimentation, organization, rigidity and overcontrol), which correlates negatively with impulsivity, also predicted dropout. The latter finding may be related to an excessive sense of guilty (frequently described in pathologic gambling69) or false beliefs about treatment or the therapist that yield emotions, including apathy, discouragement and shame, that finally lead patients with pathologic gambling to drop out of treatment.70 From another point of view, Vassileva and colleagues61 observed that high scores in antisocial personality were associated with better IGT-ABCD performance (reflecting sensitivity to reward from a neurocognitive perspective) in substance-dependent individuals, suggesting that this trait was related to better cognitive impulse control. High TCI-R disorderliness scores are associated with antisocial traits, which in the present study (similar to the study by Vassileva and colleagues61) were associated with lower risk of dropout. Along these lines, Gullo and Dawe71 stated that impulsivity also has positive aspects (see Dickman72 and Caci and colleagues73 for the concept of functional v. dysfunctional impulsivity). However, we must take into account that the relation between low disorderliness and dropout in the present study lost statistical significance after we excluded medicated patients from the sample, so the association between this trait and dropout might be circumscribed to special characteristics of patients taking medication.
Moreover, poor spatial working memory (suggestive of executive dysfunction) was associated with greater risk of dropout. Working memory deficits have also been reported in people with gambling problems.74 The present results suggest that this deficit may confer higher risk for dropout among those who seek treatment.
Poor IGT-EFGH performance was also associated with higher risk of dropout at a trend level, suggesting that those individuals who drop out of treatment tend to show an increased sensitivity to punishment and, in turn, an insensitivity to the future consequences of their actions/decisions.3,17 This finding suggests that individuals with pathologic gambling do not consider the future consequences of their actions when they decide to give up treatment, suggesting ventromedial prefrontal cortex dysfunction.75 Therefore, rash impulsiveness, sensation-seeking and strict regimentation, as well as poor spatial working memory and increased sensitivity to punishment, should be a target for additional specific interventions in pathologic gambling to enhance therapeutic adherence.
Finally, no association between the neurocognitive and self-report measures assessed and number of treatment sessions attended was identified. There are no studies about the relation between neurocognitive function and number of treatment sessions attended in pathologic gambling. Regarding the relation between self-reported impulsivity and number of treatment sessions attended, no studies have been published in the field of pathologic gambling. However, this association was studied by Patkar and colleagues76 in a sample of cocaine-dependent patients attending a 12-week, intensive outpatient treatment program, and they also failed to find an association between self-reported impulsivity and the number of treatment sessions attended. Therefore, more studies are needed in this respect.
To our knowledge, no other studies have examined the association between neuropsychological functions and dropout rates in pathologic gambling, so more research is needed to corroborate these findings.
Limitations
The present results must be assessed in the context of several limitations. First, most participants were slot-machine gamblers, and all of them were seeking treatment for this problem. This may affect the generalizability of our findings. Second, no follow-up data were available to confirm the maintenance of findings. Third, no control group was included, so we cannot conclude that the deficits that we observed are specific for pathologic gambling. Finally, the missing sample (i.e., individuals who were recruited and assessed in the pretreatment stage but who chose not to begin treatment) differed from the final sample in some measures of personality and executive functioning, so the final sample might have been biased toward a “healthier” group of people with pathologic gambling.
In sum, the present results suggest an association between overspending behaviour (extravagance in the present study) and sensitivity to reward in pathologic gambling. Treatment outcome, specifically dropout, was predicted by personality measures suggestive of deficits in self-regulation, (i.e., impulsiveness, understood as unreflective and careless behaviour) and (at a trend level) sensation-seeking, as well as by strict regimentation. Poor spatial working memory, suggesting executive dysfunction and sensitivity to punishment, reflecting insensitivity to the future, were also predictive of dropout. As far as we know, this is the first study that analyzes the effect of neurocognitive and self-report measures of impulsivity and self-regulatory deficits on treatment outcome measures of both dropout and relapse, as well as the first study that measures the effect of sensitivity to punishment (from a neurocognitive perspective) on treatment outcome. Very few studies have explored the relation between executive functioning and decision-making on the one hand, and self-report measures of impulsivity on the other, in pathologic gambling. As a personality trait, impulsivity may be difficult to modify. However, several studies suggest that “trait-oriented” interventions may optimize treatment effects in several mental disorders.77 Apart from pharmacological interventions,78 psychological interventions to modify impulsivity may include techniques to identify the impulse before acting, consider consequences and reflect on solutions. In addition, psychological interventions may be shorter and more intensive with motivational components to diminish the risk of dropout. Impulsivity in other mental disorders has also been addressed with Linehan’s Dialectical Behaviour Therapy.79 Although preliminary, these results may encourage future specific interventions addressed to diminish the risk of dropout during psychological treatment for pathologic gambling.
Acknowledgements
Dr. Álvarez-Moya was supported by a Juan de la Cierva fellowship (Ministry of Science and Innovation, Spanish government; Ref. 1048). Financial support for this study was partially received from the Spanish Fondo de Investigación Sanitaria (PI081573; PI081714). CIBER is an initiative of Instituto de Salud Carlos III.
Footnotes
Competing interests: None declared.
Contributors: Drs. Álvarez-Moya, Ochoa, Jiménez-Murcia and Fernández-Aranda designed the study. Drs. Álvarez-Moya, Ochoa, Aymamí, Gómez-Peña, Santamaría and Moragas acquired the data, which Drs. Álvarez-Moya, Bove and Menchón analyzed. Drs. Álvarez-Moya, Ochoa, Jiménez-Murcia, Santamaría and Moragas wrote the article, which Drs. Jiménez-Murcia, Aymamí, Gómez-Peña, Fernández-Aranda, Bove and Menchón critically reviewed. All authors approved publication of the article.
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