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Logo of bmcpsycBioMed Centralsearchsubmit a manuscriptregisterthis articleBMC Psychiatry
 
BMC Psychiatry. 2012; 12: 102.
Published online Aug 7, 2012. doi:  10.1186/1471-244X-12-102
PMCID: PMC3466121
Exploring psychotic symptoms: a comparison of motor related neuronal activation during and after acute psychosis
Luke Sheridan Rains,1 Gregory Fallica,1 Owen O’Daly,1 James Gilleen,1 Vincent Giampetro,1 Lucy Morley,1 and Sukhi Shergillcorresponding author1
1Institute of Psychiatry, De Crespigny Park, London SE5 8AF, UK
corresponding authorCorresponding author.
Luke Sheridan Rains: Luke.sheridan/at/kcl.ac.uk; Gregory Fallica: gregory.fallica/at/kcl.ac.uk; Owen O’Daly: owen.odaly/at/kcl.ac.uk; James Gilleen: James.1.Gilleen/at/kcl.ac.uk; Vincent Giampetro: vincent.Giampetro/at/kcl.ac.uk; Lucy Morley: lucy.morley/at/slam.nhs.uk; Sukhi Shergill: sukhi.shergill/at/kcl.ac.uk
Received February 6, 2012; Accepted July 10, 2012.
Abstract
Background
Delusions and hallucinations are classic positive symptoms of schizophrenia. A contemporary cognitive theory called the ‘forward output model’ suggests that the misattribution of self-generated actions may underlie some of these types of symptoms, such as delusions of control – the experience of self-generated action being controlled by an external agency. In order to examine the validity of this suggestion, we performed a longitudinal functional magnetic resonance imaging (fMRI) study examining neuronal activation associated with motor movement during acute psychosis.
Methods
We studied brain activation using fMRI during a motor task in 11 patients with schizophrenia and 9 healthy controls. The patient group was tested at two time points separated by 6–8 weeks.
Results
At initial testing, the patient group had a mean Positive and Negative Syndrome Scale score of 56.3, and showed significantly increased activation within the left inferior parietal lobe (IPL) compared to controls. Patients reported significantly decreased positive symptoms at 6–8 week followup and IPL activation had returned to normal. Our results demonstrate that first-rank positive symptoms are associated with hyperactivation in the secondary somatosensory cortex (IPL).
Conclusions
These findings lend further credence to the theory that a dysfunction in the sensory feedback system located in the IPL, and which is thought to underlie our sense of agency, may contribute to the aetiology of delusions of control.
Keywords: Schizophrenia, Neuroimaging, Delusions, Hallucinations
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