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Handwriting Analysis Indicates Spontaneous Dyskinesias in Neuroleptic Naïve Adolescents at High Risk for Psychosis

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Anticipating the future: automatic prediction failures in schizophrenia.

Judith M Ford¹, Daniel H Mathalon

¹Psychiatry Service, San Francisco VA Medical Center, 4150 Clement Street, San Francisco, CA 94121, USA. Judith.ford@yale.edu

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology

|October 1, 2011

Summary

People with schizophrenia may experience psychosis due to impaired prediction of sensory information. This study reveals deficits in automatic prediction mechanisms, impacting how individuals process expected versus unexpected experiences.

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Area of Science:

Neuroscience
Psychiatry
Cognitive Science

Background:

Schizophrenia is characterized by altered sensory perception and interpretation, potentially linked to prediction deficits.
Healthy individuals utilize unconscious neural mechanisms for prediction, aiding sensory processing and distinguishing expected from unexpected stimuli.

Purpose of the Study:

To investigate automatic, unconscious prediction mechanisms in individuals with schizophrenia.
To determine if failures in predicting sensory input contribute to schizophrenia's core features.

Main Methods:

Examined auditory cortical responses during self-generated speech (talking) to assess efference copy mechanisms.
Assessed brain responses to unexpected event repetitions to evaluate context-based prediction (learning).

Main Results:

Reduced suppression of auditory cortical responses during talking in schizophrenia patients, indicating impaired prediction of self-generated sounds.
Diminished brain response to unexpected event repetitions in patients, suggesting a failure to predict contextual changes.

Conclusions:

Schizophrenia diagnosis may be characterized by failures in both innate (efference copy) and learned (contextual) prediction mechanisms.
These prediction deficits are proposed as fundamental to schizophrenia, rather than being tied to specific symptoms.