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Monday, October 8 • 5:15pm - 5:25pm
Oral 6, Talk 5. "Auditory Verbal Hallucinations In First Episode Psychosis – An FMRI Symptom Capture Study"

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Thomas Dunne1, Pavan Mallikarjun1,2, Renate Reniers1, Baldeep Farmah5, Matthew Broome4, Femi Oyebode1,2, Stephen Wood1,3, Rachel Upthegrove1,2; 1The University of Birmingham, UK, 2Birmingham and Solihull Mental Health NHS Foundation Trust, 3The University of Melbourne, Australia, 4The University of Oxford, UK. Oxford Early Intervention in Psychosis Service, 5Worcester Health and Care NHS Trust
               
Introduction Neurobiological models of auditory verbal hallucination (AVH) have been advanced by symptom capture functional magnetic resonance imaging (fMRI), where participants self-report hallucinations during scanning. To date, regions implicated are those involved with language, memory and emotion. However, previous studies focus on chronic schizophrenia, thus are limited by factors such as medication use and illness duration. Studies also lack detailed phenomenological descriptions of AVHs. This study investigated the neural correlates of AVHs in patients with first episode psychosis (FEP) using symptom capture fMRI with a rich description of AVHs. We hypothesised that intrusive AVHs would be associated with dysfunctional salience network activity.  Methods 16 FEP patients with frequent AVH completed four psychometrically validated tools to provide an objective measure of the nature of their AVHs. They then underwent fMRI symptom capture, utilising general linear models analysis to compare activity during AVH to the resting brain.  Results Symptom capture of AVH was achieved in nine patients who reported intrusive, malevolent and uncontrollable AVHs. Significant activity in the right insula and superior temporal gyrus (cluster size 141mm3), and the left parahippocampal and lingual gyri (cluster size 121mm3), p<0.05 FDR corrected, were recorded during the experience of AVHs. Conclusions These results suggest salience network dysfunction (in the right insula) together with memory and language processing area activation in intrusive, malevolent AVHs in FEP. This finding concurs with others from chronic schizophrenia, suggesting these processes are intrinsic to psychosis itself and not related to length of illness or prolonged exposure to antipsychotic medication.


Speakers

Monday October 8, 2018 5:15pm - 5:25pm EDT
St. George CD Westin Copley Place, third floor

Attendees (3)