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Logo of nihpaAbout Author manuscriptsSubmit a manuscriptNIH Public Access; Author Manuscript; Accepted for publication in peer reviewed journal;
 
Hum Brain Mapp. Author manuscript; available in PMC Dec 1, 2013.
Published in final edited form as:
PMCID: PMC3262063
NIHMSID: NIHMS320110
Increased Executive Functioning, Attention, and Cortical Thickness in White-Collar Criminals
Adrian Raine, D.Phil.,1 William S. Laufer, JD, Ph.D.,2 Yaling Yang, Ph.D.,3 Katherine L. Narr, Ph.D.,3 Paul Thompson, Ph.D., and Arthur W. Toga, M.D., PhD.3
1Departments of Criminology, Psychiatry, and Psychology, University of Pennsylvania
2Wharton School, University of Pennsylvania
3Laboratory of Neuro-Imaging, Department of Neurology, David Geffen School of Medicine, UCLA, Los Angeles, CA
Corresponding Author: Adrian Raine, Departments of Criminology, Psychiatry, and Psychology, 3809 Walnut Street, University of Pennsylvania, Philadelphia, PA 19104., Tel. 215 746 2198, Fax: 215 746 4239, araine/at/sas.upenn.edu
Very little is known on white collar crime and how it differs to other forms of offending. This study tests the hypothesis that white collar criminals have better executive functioning, enhanced information processing, and structural brain superiorities compared to offender controls. Using a case-control design, executive functioning, orienting, and cortical thickness was assessed in 21 white collar criminals matched with 21 controls on age, gender, ethnicity, and general level of criminal offending. White collar criminals had significantly better executive functioning, increased electrodermal orienting, increased arousal, and increased cortical gray matter thickness in the ventromedial prefrontal cortex, inferior frontal gyrus, somatosensory cortex, and the temporal-parietal junction compared to controls. Results, while initial, constitute the first findings on neurobiological characteristics of white-collar criminals It is hypothesized that white collar criminals have information-processing and brain superiorities that give them an advantage in perpetrating criminal offenses in occupational settings.
Keywords: antisocial, ventromedial, inferior frontal, temporal-parietal, somatosensory, orienting, arousal, electrodermal
Over the past decade an increasing body of research has documented neurocognitive1, psychophysiological24, brain structural/function58, neurochemical911, and genetic12 processes in the putative etiology of antisocial, criminal, and violent behavior. Nevertheless, a significant gap in the emerging field of neurocriminology consists of research on subtypes of criminal offenders. In particular, there has been no research on the neuroimaging, psychophysiological, or neuropsychological correlates of white-collar criminals.
White collar crime has been defined quite broadly as “economic offenses committed through the use of some combination of fraud, deception, or collusion” (p. 642)13. While white collar crime was recently conceived as elite, upper world, and upper class offending14, more recent research has shown that white collar offenders are generally middle to lower-middle class, do not specialize in one form of crime, and also perpetrate street crimes15. In explaining white collar crime, criminologists have focused on organizational norms, culture, managerial leadership, decision making, compensation, and incentives 16. In contrast, little or no attention has been be paid to differences between blue-collar street offenders and white collar offenders. White collar offenders however have been viewed as engaging in a careful calculation of the both costs and benefits of offending17, although this has not been pursued empirically.
Given prior research revealing neurobiological correlates of antisocial and criminal behavior, it is hypothesized that neurobiological characteristics may also exist for white collar offending. Rather than conceiving these characteristics as deficits, they more likely aid them in accommodating the structure, function, and culture of an organization, allowing white collar offenders to engage in elaborate calculations that consider a wide-range of factors. Given the evidence that white collar crime is both a reaction and adaptation to a range of organizational and structural variables18, and given that there is a rationality to this kind of offending that requires careful calculations, we hypothesize that white collar offenders have superior executive functioning and attentional functioning compared to controls, as well as enhanced brain cortical thickness, particularly in brain areas that play a role in decision-making, attention, and social perspective-taking and which could confer an advantage in their reaction and adaptation to organizations.
Participants
Eighty-seven participants (75 male, 12 female) were recruited from five temporary employment agencies19. Exclusion criteria included: age under 21 or over 46, non-fluency in English, history of epilepsy, claustrophobia, pacemaker, ostensible neurological abnormality, and metal implants. Written informed consent was obtained from all subjects, and the study was approved by an institutional review board. This community recruitment strategy is novel, but has the advantage that it samples individuals at high socioeconomic risk, with an eight-fold increase in the yield of those with psychopathy/antisocial personality19.
Participants were classified as white collar criminals if they had committed white collar criminal offenses (see below). Using a case-control design, 21 individuals who committed white-collar criminal offenses were matched with 21 participants who had never perpetrated a white collar crime on age, gender, and ethnicity. In addition, in order to control for non-white collar criminal offenses that the white collar criminals had also committed, the two groups were matched on total non-white collar crime scores (see below). Results of this matching process are presented in Table 1, along with group means on IQ, social class, and official crime. Social class was measured using Hollingshead’s Index of Social Position 20. Handedness was assessed on a dimensional scale as used in our prior research, with higher scores indicating greater right-handedness19.
Table 1
Table 1
Group comparisons between white collar criminals (N = 21) and controls (N = 21) on the matching variables age gender, ethnicity, blue collar crime), as well as IQ, socio-economic status, and criminal arrests/convictions.
Criminal Offending
White and blue collar crime was assessed using a 50-item adult extension of the self-report National Youth Survey 21, assessing property, violence, sex, and drug offenses. White collar crime was defined by the following items: used computers illegally to gain money or valuable information, cheated or conned a person, business, or government for gain; obtained unemployment or sickness benefit by telling lies, stolen supplies from work, using a stolen check or credit card, and lied about income on a tax return22. Blue-collar crime was assessed based on all other criminal offenses. Each item was scored on a three-point scale as follows: 0 (none), 1 (one to two occurrences) 2 (3 or more). Official (detected) crime was assessed from a search of Department of Justice criminal records, with total numbers of arrests and convictions coded for each participant 19. Only two of the 21 white-collar criminals had been charged with a white-collar crime, in both cases for forgery. One individual had two charges and one conviction, while the other had four charges and two convictions.
To encourage both transparency and authenticity by subjects, a certificate of confidentiality was obtained from the Secretary of Health, pursuant to Section 303(a) of Public Health Act 42. Participants were informed that any information they might provide about uninvestigated crimes could not be subpoenaed by any United States federal, state, or local court. Participants were reminded of confidentiality during administration of the measure and the limits to the confidentiality certificate.
Neurocognitive functioning
Executive functioning was assessed using the computerized version of the Wisconsin Card Sorting Test (WCST; 23). Scores for categories achieved (the number of times a participant correctly sorted 10 consecutive cards), perseverative errors (the number of times cards in incorrect response is repeated) and correct responses (number of cards correctly classified) were computed.
Total IQ was estimated using four sub-tests (vocabulary, arithmetic, block design, and digit symbol) of the Wechsler Adult Intelligence Scale – Revised (WAIS-R) 24. Verbal IQ was estimated using vocabulary and arithmetic, while performance IQ was estimated using block design and digit symbol subtests.
Psychophysiological assessment
Acquisition
Skin conductance was measured during both rest and orienting conditions. Participants were tested in a temperature-controlled, light-and sound-attenuated psychophysiological recording laboratory. Bilateral skin conductance was recorded from the distal phalanges of the first and second fingers of the both hands25 using Beckman Ag/AgCl electrodes of 1 cm. diameter with physiological saline (0.9% NaCl) in Unibase as the electrolyte. Skin contact area was delineated using double-sided adhesive masks with a hole of 1 cm diameter. Recordings were made using a Grass Model 7 polygraph (Quincy, MA) with a constant 0.5V potential across electrodes for direct recording of skin conductance26. Participants were instructed that after a 3 minute rest period they would hear a series of tones that would last about 5 minutes.
Orienting stimuli
10 orienting stimuli were presented with inter-stimulus intervals randomized between 25 and 40 seconds, consisting of six 75 dB tones of 1000 Hz frequency, 25 ms rise time, and one second duration. These were followed by four more attentionally-meaningful stimuli consisting of a reorienting stimulus (500 Hz tone of 75 dB intensity, one second duration), a consonant-vowel stimulus (“da”, 0.35 seconds duration, 75 dB intensity), one 90 dB pure tone (1 second duration, 1,000 Hz frequency), and one 90 dB white noise burst (1 second duration, 5 msec rise time).
Scoring
Orienting was assessed by the number of skin conductance responses (SCRs) > .05 microsiemens in amplitude occurring within a latency window of 1–3 secs. post-stimulus. Arousal was assessed by the number of non-specific SC responses occurring during the three minute rest period (using the same amplitude criterion as for SCRs above), together with SC levels at the end of the rest period. Habituation was defined as the number of trials to give three consecutive non-responses.
Neuroimaging
Acquisition
Structural MRIs were conducted on a Philips S15/ACS scanner (Selton, Connecticut) with a 1.5 Tesla magnet. Following an initial alignment sequence of one midsaggital and four parasagittal scans (spin-echo T1-weighted image acquisition, TR = 600 ms, TE = 20 ms) to identify the AC-PC plane, 128 3D T1-weighted gradient-echo coronal images (TR 34 ms, TE 12.4 ms, flip angle 35°, 1.7 mm slices, 256×256 matrix, FOV = 23 cm) were taken orthogonal to the AC-PC line.
Image analysis
A series of previously detailed preparatory steps 27,28 were applied to the MR data including the removal of extra-cortical tissue, the correction for inhomogeneities, head tilt and orientation, and place the data into the ICBM-305 common stereotaxic space. Next, a fully-automated partial volume classifier was applied to classify voxels into GM, white matter (WM) and CSF. Total intracranial volumes (excluding the pons and cerebellum) and volumes of each brain tissue compartment were estimated. Finally, a surface-rendering algorithm was used to create a three-dimensional model of the cortical surface for each individual 27,28.
Cortical Pattern Matching
Thirty-one sulcal landmarks were delineated manually in each hemispheric surface following previously validated protocols27,28 for which intra- and inter-rater reliability has been established 28. Cortical pattern matching methods were then applied to spatially relate homologous regions of the cortex between subjects that allows for measurement and comparison of cortical thickness at homologous locations in each individual 27,28. Next, the previously obtained tissue classified brain volumes were used to calculate the GM thickness at all spatially aligned hemispheric surface points within subjects and then compared between groups to provide spatially detailed maps indexing very local differences in cortical thickness across the brain.
Statistical analyses
Multivariate analysis of variance (MANOVA) was used to analyze the Wisconsin Card Sorting Task executive functioning measures. Repeated measures MANOVAs (group × hand) were used to analyze the left and right hand skin conductance data.
To address the hypothesis of group differences in cortical thickness, statistical analyses were conducted using the general linear model implemented in R (www.r-project.org) to identify regional changes in cortical thickness between groups while covarying for whole brain volume. Uncorrected two-tailed probability values obtained from statistical tests conducted for each cortical surface point were color-coded and displayed on the averaged cortical surface representations of the entire group to allow initial visualization of group differences.
Since comparisons were made at thousands of spatially correlated cortical locations, permutation tests with a threshold of p < .05 were applied to ensure that the overall pattern of effects in the uncorrected statistical maps could not have been observed by chance alone (Yang et al., 2009). Permutation testing was performed for each hemisphere and within 20 gyral regions obtained using the Laboratory of NeuroImaging Probabilistic Brain Atlas (LPBA40) 29 (http://www.loni.ucla.edu/Atlases/LPBA40).
Neurocognitive functioning
White collar criminals showed significantly better executive functioning. A single MANOVA conducted on categories completed, perseverative errors, and number correct showed a significant group effect, F(3,38) = 3.43, p = .026, eta2 = .21, with white collar criminals showing significantly better executive functioning than controls (see Table 2). Specifically, white collar criminals demonstrated significantly higher scores on categories achieved (p < .027). White collar criminals also evidenced a trend towards reduced perseveration errors (p <.14, d = .47).
Table 2
Table 2
Group comparisons on executive functioning and electrodermal measures or arousal, orienting, and habituation. Standard deviations are in parentheses. Executive functioning represents a standardized score. SCRs (skin conductance response). SCLs (skin conductance (more ...)
White collar criminals had non-significantly higher verbal IQ and performance IQ (see Table 1). To assess whether this trend could account for the better executive functioning in white collar criminals, multivariate analyses on executive functioning measures were repeated after entering IQ as a covariate. Although IQ was a significant covariate (p < .0001), group differences on executive functioning remained significant, F(1,37) = 3.04, p = .041, eta2 = .20.
Arousal, Orienting, and Habituation
Arousal
White-collar criminals showed significantly higher electrodermal arousal at rest compared to controls, F(1.36) = 5.73, p = .02. eta2 = .14. A MANOVA revealed a significant group × measure interaction (F(1,36) = 7.54, p = .009, eta2 = .17) indicated that the higher resting arousal was more accounted for by non-specific skin conductance responses than by skin conductance levels (see Table 2).
Orienting
White-collar offenders gave significant more left and right hand skin conductance orienting responses (mean of left and right hand combined = 4.19, SD = 3.02) than controls (mean = 2.88, SD = 3.11), F(2,39) = 3.55, p = .038, eta2 = .15. While group differences tended to be stronger on the left hand (see Table 2), although this trend for a group × hand interaction was non-significant, F(1,40) = 4.06, p = .051, eta2 = .09, (see Table 2).
Habituation
White collar criminals took longer to habituate to the orienting stimuli 5.6 trials (averaging across hands, SD = 1.55) compared to controls (4.4 trials, SD = 1.72). A group × hand repeated measures MANOVA revealed a main effect for group, F(1,40) = 4.73, p = .036, eta2 = .11, and a group × hand interaction, F(1,40) = 5.41, p = .035, eta2 = .12. A breakdown of this interaction indicated that the sustained attention of the white collar offenders was stronger for the left hand (t = 2.90, df = 40, p = .006) compared to the right hand (t = 1.38, df = 40, p = .18).
Cortical thickness
Maps of the uncorrected two-tailed probability values for each cortical surface point for the lateral and medial surfaces of left and right hemisphere are shown in Figure 1 and allow initial visualization of group differences. It can be seen that in all cases white collar criminals have increased cortical thickness in multiple areas, with no evidence of reduced thickness.
Figure 1
Figure 1
Results of cortical pattern matching analysis identifying group differences in left and right hemisphere cortical thickness throughout lateral, medial, and inferior surfaces, together with Brodmann maps of the corresponding regions. Warm colors (purple, (more ...)
Permutation-corrected analyses on gyral areas indicated significant group differences in cortical thickness in white collar criminals in 5 main regions. Specifically, white collar criminals showed increased cortical thickness in the left ventromedial prefrontal cortex (p = .043; BAs 11), the right inferior frontal gyrus (p = .038; BA 44), the right precentral gyrus (p = .036; BA 6), the right postcentral gyrus (p = .018; BA 1,2,3), the right posterior superior temporal gyrus forming part of the temporal-parietal junction (p = .03; BAs 41, 42, 22), and the inferior parietal region of the right temporal parietal junction (p = .03; BAs 39, 40, 43).
White-collar criminals demonstrate better executive functions, increased and sustained orienting, increased arousal, and increased cortical thickness in multiple brain regions subserving decision-making, social cognition, and attention. Results, while provisional, constitute the first findings on neurobiological characteristics of white-collar criminals. Findings lend support to the hypothesis that white-collar criminals, compared to other offenders, have enhanced cognitive and attentional functioning that place them at an advantage in committing offenses in the workplace.
White-collar criminals had better executive functioning as assessed by a classic measure of this neurocognitive ability, the Wisconsin Card-Sorting Task. This task measures concentration, planning, organization, cognitive flexibility in shifting strategies to achieve a goal, working memory, and the ability to inhibit impulsive responding23. White-collar offenders appear paradoxically to have the type of neurocognitive capacity and skills that would normally place them at a job performance advantage, a finding consistent with an extension of rational choice theory of white collar offending17.
At a psychophysiological level, white-collar criminals also showed increased electrodermal arousal at rest compared to matched controls. This was most strongly indicated by spontaneous skin conductance responses which reflect ongoing cognitive processing and sustained attention 30. They also gave large skin conductance responses to both neutral as well as attentionally-meaningful auditory stimuli, including consonant-vowel speech stimuli, indicating greater attentional processing. They additionally took more trials to habituate, indicating sustained attention to these auditory probes. Increased orienting has been associated with increased activation of the ventromedial prefrontal cortex, the temporal-parietal junction, the supramarginal gyrus, and the amygdala, particularly in the right hemisphere 31,32. Increased cortical thickness was observed in the first three of these right hemisphere regions in white collar criminals and may partly account for their heightened attentional processing to external stimuli.
At the level of brain structure, white-collar offenders showed greater cortical thickness in five circumscribed areas compared to matched controls (see Figure 1). First, they showed increased thickness in the right inferior frontal gyrus (BA 44). The inferior frontal gyrus has been implicated in a number of executive functions, particularly cognitive control and response inhibition. These functions include the ability to coordinate thoughts and actions in relation to internally generated goals, the ability to respond to changes in task demands, the ability to inhibit a dominant response, and the ability to resolve conflicting reasoning 33, 34, 35. Recent research has increasingly documented localization of these inferior frontal functions to the right hemisphere 34,35,36,37,38. This posterior region of the fronto-lateral cortex also constitutes part of the inferior frontal junction, an area centrally involved in cognitive control systems, response inhibition, and task switching 25. Taken together with findings of better executive functioning, increased cortical thickness of the inferior frontal gyrus and inferior frontal junction is consistent with increased cognitive flexibility and regulatory control in white collar criminals compared to matched controls.
The second area of increased cortical thickness in white collar criminals constituted the ventromedial prefrontal cortex (Brodmann area 11). This region has been associated with good decision-making, sensitivity to the future consequences of one’s actions, and the generation of skin conductance responses 39,40. This structural advantage is again broadly consistent with the better executive functioning, skin conductance orienting, arousal, and attention observed in white-collar criminals. The ventromedial prefrontal cortex is additionally involved in the monitoring of the reward value of stimuli, and learning and remembering what stimuli are rewarding 41. Functional imaging studies have shown that it is the anterior region of the ventromedial prefrontal cortex that is specifically associated with abstract rewards, particularly money 41. In contrast, less abstract and more fundamental rewards (such as taste) are processed in the more posterior regions of this ventromedial area 42. White collar criminals had increased cortical thickness in the anterior but not posterior ventromedial region (see Figure 1). As such, increased cortical thickness in the anterior region of the ventromedial prefrontal cortex gives rise to the hypothesis that white-collar criminals are particularly driven by abstract monetary rewards as opposed to less abstract rewards.
A third area of increased cortical thickness consisted of the ventro-lateral premotor area of the precentral gyrus (BA 6). This sub-region is involved in monitoring performance and decision-making, planning and programming of movements, and facilitating and inhibiting motor actions depending on the behavioral context 43,44. In addition to these motor control functions, the premotor area has also been implicated in the ability to understand the intentions of others’ actions 45 and social perception 46. The ventro-lateral region of the premotor area also constitutes a part of the inferior frontal junction involved in response inhibition and task switching 47. While we had not anticipated group differences in this region and while such structural findings should consequently be treated with caution, they are nevertheless broadly consistent with the hypothesis of adept executive functioning and social cognition in white collar criminals.
A fourth area of increased cortical thickness consists of the inferior region of somatosensory cortex (BAs 1,2,3). The somatic marker hypothesis of decision-making argues that the ventromedial prefrontal cortex receives information from the somatosensory cortex in which both past and present bodily states are continuously represented 48. The ventromedial prefrontal cortex in turn is argues to be an integral component of a neural emotional mechanism that uses somatic markers to guide good decision-making 48,49. Consequently, increased somatosensory cortical thickness combined with increased ventromedial thickness, increased electrodermal orienting, and better executive functioning may be broadly explicable in the context of the somatic marker theory that has recently been applied to economic decision-making 49. Unlike conventional criminal offenders who are hypothesized to have somatic marker deficits and poor decision-making skills 21, 39, 48, white-collar criminals may instead be characterized by relatively better decision-making skills.
Fifth, white-collar criminals compared to matched controls showed increased cortical thickness in a broad area of the temporal-parietal junction that included the right posterior superior temporal gyrus (BA 41,42) and the right inferior parietal lobule (BA 39, 40, 43), including the angular gyrus (BA 39) and the supramarginal gyrus (BA 40). The right temporal-parietal junction is centrally involved in both social cognition and orienting, including the ability to process social information, perspective-taking, theory-of-mind, and executive control tasks 50,51. The temporal-parietal junction is also involved in orienting directing attention to external events of interest, and facilitating appropriate responses to these events 50. Because Brodmann areas 41 and 42 also constitute primary auditory cortex, increased cortical thickness in the temporal-parietal junction may both help account for the better electrodermal orienting to auditory stimuli shown by white-collar criminals, and lends support to the hypothesis that they may be characterized by better social perspective-taking and the ability to read others which may place them at an advantage in an occupational context for the perpetration of white collar crimes.
Because the WCST has been traditionally viewed as reflecting dorsolateral prefrontal functioning, one might expect white collar criminals to show increased cortical thickness of this region. However, more recent functional imaging research on the WCST has delineated a much more complex neural circuit underlying task performance that extends well beyond dorsolateral prefrontal regions, involving a much broader fronto-temporal-parietal system. Specifically, the right orbitofrontal cortex (inhibition of previously acquired rules), the inferior frontal gyrus (executive working memory), and the temporal-parietal junction (detection of errors and utilization of feedback) are all activated by the WCST, with such activation being predominantly in the right hemisphere 52. The fact that white collar criminals demonstrated increased cortical thickness in all these right hemisphere cortical regions provides a degree of convergence between these cortical thickness increases and enhanced executive functioning in white collar offenders.
Limitations of this study should be clarified. First, the control group was matched with the white-collar criminals on general criminal offending to control for the fact that white-collar criminals also commit non-white collar crimes 15. While it is critically important to conduct such a control for general level of offending, it remains to be seen how these two groups differ to non-criminal controls. This initial study needs to be replicated and extended by examining a four group design (non-criminal controls, blue collar crime only, blue and white collar, white collar crime only) to further establish whether white collar criminals have brain superiorities compared to normal controls, although we recognize that such a complex design has never been undertaken to date even in the social sciences. Second and relatedly, it could be argued that rather than white-collar criminals having structural and functional brain superiorities compared to controls, the criminal controls have diminished neurocognitive functioning and brain structure. Such a counter-interpretation however cannot account for the fact that white collar criminals had an equivalent level of blue collar “street” criminal offending compared to controls; this should lead to the prediction that white collar offenders should show neurocognitive and brain deficits, yet this was not the case. Third, this study does not include white-collar criminals who are convicted of major fraud or high-profile crimes, and consequently findings cannot be generalized to these populations. Fourth and relatedly, the self-report method for assessing white collar crime has inevitable limitations, although it also has a distinct advantage over official crime reports in accessing the “dark figure” of white collar crime. Fifth, prospective longitudinal studies are required to assess whether structural brain superiorities precede the onset of offending, or conversely whether the better executive functioning required of white collar crime results in later brain changes. Sixth, given the relatively robust finding of increased right ventromedial prefrontal cortical thickness in white collar criminals, future studies of these offenders could usefully extended neurocognitive testing to include measures more reflective of this neural region, and assess whether structure and function measures covary. Finally, while the observed neurocognitive, psychophysiological, and brain structural characteristics may make some individuals better equipped to perpetrate white collar offending in workplace, these advantages do not confer criminality per se, as indicated by the fact that the control group with equal levels of blue collar crime lack these characteristics.
Despite these limitations, this initial study provides the first evidence of a neurobiological basis to white collar crime and a novel conceptual perspective on this societal problem. Theories of white collar offending must not only recognize the core antisocial behaviors in this group, but also the neurobiological trait characteristics which may confer an adaptive advantage to offenders in the workplace. These findings, while preliminary and limited by the nature of this high-risk temporary employment agency sample, are broadly consistent with the idea that white collar criminals engage in a careful and rational calculation of both the costs and benefits of offending. Findings highlight the complexity of crime and raise the future challenge to forensic psychiatry, criminology, and the corporate world of extending these initial findings on white collar offenders to more serious offenders in financial institutions.
Acknowledgments
The authors wish to thank Jennifer Bobier, Nicole Diamond, Kevin Ho, Lori Lacasse, Todd Lencz, Shari Mills, and Pauline Yaralian for assistance in data collection. This study was supported by an Independent Scientist Award (K02 MH01114-01) and grants from both the National Institute of Mental Health (5 RO3 MH50940-02) and the Wacker Foundation to Adrian Raine, and an NIH grant (P41 RR013642) to Arthur Toga.
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