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Psychophysiological evidence for altered information processing in delusional misidentification syndromes
Charalabos Papageorgiou1, Errikos Ventouras, Lefteris Lykouras
1Psychophysiology Laboratory, Department of Psychiatry, Eginition Hospital, Medical School, University of Athens, 74 Vas. Sophias Avenue, Athens GR-11528, Greece. panchris@otenet.gr
Progress in Neuro-Psychopharmacology & Biological Psychiatry
|April 15, 2003
Summary
Delusional misidentification syndromes (DMS) are linked to cognitive deficits. This study found altered brain activity (P300 ERPs) in DMS patients, indicating working memory and attention issues.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Delusional misidentification syndromes (DMS) are associated with cognitive deficits.
- The precise mechanisms underlying these cognitive deficits in DMS remain unclear.
- Event-related potentials (ERPs), specifically the P300 component, are crucial for working memory (WM).
Purpose of the Study:
- To investigate P300 event-related potentials (ERPs) during a working memory (WM) task in patients with Delusional Misidentification Syndromes (DMS).
- To compare ERPs and memory performance between DMS patients and healthy controls.
- To explore the neural underpinnings of cognitive deficits in DMS.
Main Methods:
- A computerized digit span test from the Wechsler batteries was administered to 9 DMS patients and 11 healthy controls.
- Auditory event-related potentials (ERPs) were measured during the anticipatory period of the working memory task.
- P300 amplitude and latency were analyzed in different brain regions.
Main Results:
- DMS patients exhibited significantly reduced P300 amplitude in the right frontal region compared to controls.
- P300 latency was significantly prolonged in the central midline brain region for the DMS group.
- Both P300 measures accurately classified 90% of individuals into their respective groups (DMS vs. controls).
- DMS patients demonstrated significantly lower memory performance than healthy controls.
Conclusions:
- DMS is associated with psychophysiological alterations in the right frontal region, impacting automatic processes.
- Cognitive deficits in DMS may involve irregular allocation of attentional resources and interhemispheric circuitry dysfunction.
- Findings suggest potential gray matter degeneration contributing to these alterations.
- Further research is warranted to understand the characteristics, causes, course, and treatment of severe cognitive deficits in DMS.