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Reduced susceptibility to the sound-induced flash fusion illusion in schizophrenia

Vanes, LD; White, TP; Wigton, RL; Joyce, D; Collier, T; Shergill, SS; (2016) Reduced susceptibility to the sound-induced flash fusion illusion in schizophrenia. Psychiatry Research , 245 pp. 58-65. 10.1016/j.psychres.2016.08.016. Green open access

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Abstract

Schizophrenia is characterised by the presence of abnormal complex sensory perceptual experiences. Such experiences could arise as a consequence of dysfunctional multisensory integration. We used the sound-induced flash illusion paradigm, which probes audiovisual integration using elementary visual and auditory cues, in a sample of individuals with schizophrenia (n=40) and matched controls (n=22). Signal detection theory analyses were performed to characterise patients’ and controls’ sensitivity in distinguishing 1 and 2 flashes under varying auditory conditions. Both groups experienced significant fission illusions (whereby one visual flash, accompanied by two auditory beeps, is misperceived as two flashes) and fusion illusions (whereby two flashes, accompanied by one beep, are perceived as one flash). Patients showed significantly lower fusion illusion rates compared to HC, while the fission illusion occurred similarly frequently in both groups. However, using an SDT approach, we compared illusion conditions with unimodal visual conditions, and found that illusory visual perception was overall more strongly influenced by auditory input in HC compared to patients for both illusions. This suggests that multisensory integration may be impaired on a low perceptual level in SZ.

Type: Article
Title: Reduced susceptibility to the sound-induced flash fusion illusion in schizophrenia
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.psychres.2016.08.016
Publisher version: https://doi.org/10.1016/j.psychres.2016.08.016
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Schizophrenia, Multisensory integration, Fission illusion, Fusion illusion
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Imaging Neuroscience
URI: https://discovery.ucl.ac.uk/id/eprint/10070602
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