# Corollary discharge dysfunction in auditory verbal hallucinations: N100 suppression measured with semi-dry electrodes - URL: https://alisanburak.com/en/wcp-2026-posterler/so412 - Language: en - Last updated: not specified - Page title: Corollary discharge dysfunction in auditory verbal hallucinations: N100 suppression measured with semi-dry electrodes | WCP 2026 Summary > N100 suppression decreases as the severity of auditory verbal hallucinations increases, supporting impaired corollary discharge as a neurophysiological basis o… This page was translated automatically from Turkish. [Read the original](https://alisanburak.com/wcp-2026-posterler/so412) This page is an AI-assisted Turkish summary of the study presented at the 26th World Congress of Psychiatry. The study belongs to the presenting authors; please refer to the original source when citing it. SO412 Brief Oral Poster PresentationNeuroscience and ImagingCase-control study (EEG) # Corollary discharge dysfunction in auditory verbal hallucinations: N100 suppression measured with semi-dry electrodes COROLLARY DISCHARGE DYSFUNCTION IN AUDITORY VERBAL HALLUCINATIONS: N100 SUPPRESSION MEASURED WITH SEMI-DRY ELECTRODES Presenter: Ella Sonnelid Country: Sweden Institution: Uppsala University, Department of Medical Sciences, Clinical Psychiatry Session: 4450 - PARALLEL SHORT ORAL POSTER SESSIONS: PSYCHOSIS & SCHIZOPHRENIA - Part V Date: Sat, 26.09.2026 N100 suppression decreases as the severity of auditory verbal hallucinations increases, supporting impaired corollary discharge as a neurophysiological basis of hallucinations. The study aimed to investigate corollary discharge function in auditory verbal hallucinations (AVH) in a sample whose hallucinations were assessed in detail, and to evaluate the feasibility of using semi-dry electrodes in event-related potential (ERP) research. An EEG paradigm (the Say Ah task) was administered to 14 patients with persistent auditory hallucinations and 15 healthy controls, comparing a speaking condition, in which participants heard their own self-generated voice, with a listening condition, in which they heard a recording of the same voice. N100 suppression was calculated in microvolts (µV) as the difference in peak amplitude between the two conditions within the 60–150 ms window. Hallucinations were assessed using the Psychotic Symptom Rating Scales–Auditory Hallucinations Subscale (PSYRATS-AHS), which captures auditory hallucinations more directly than alternative scales. A group comparison in the frontocentral region of interest (Fz-Cz) revealed a trend toward greater N100 suppression in healthy controls than in patients with AVH, although the difference did not reach statistical significance (p = 0.095; Cohen’s d = 0.64). In the AVH group, a significant negative correlation was found between N100 suppression and hallucination severity (r = -0.538; p = 0.047), indicating that patients with more severe hallucinatory symptoms showed less suppression. These findings support an association between dysfunction of the corollary discharge mechanism, which attenuates neural responses to self-generated speech, and the mechanism underlying hallucinations. The authors emphasize that linking this EEG measure to clinical measures is important for identifying potential treatment targets; however, the sample was small, and the between-group difference remained only a trend. [View the original poster](https://cslide.ctimeetingtech.com/wcp26/attendee/eposter/file/2217) How to cite this study APA 7: Sonnelid, E., et al. (2026, September 26). Corollary discharge dysfunction in auditory verbal hallucinations: n100 suppression measured with semi-dry electrodes [Poster presentation]. 26th WPA World Congress of Psychiatry (WCP 2026), Stockholm, Sweden. https://cslide.ctimeetingtech.com/wcp26/attendee/eposter/file/2217 Vancouver: Sonnelid E, et al. Corollary discharge dysfunction in auditory verbal hallucinations: n100 suppression measured with semi-dry electrodes [poster]. 26th WPA World Congress of Psychiatry (WCP 2026); 2026 Sep 23-26; Stockholm, Sweden. 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