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Behavioral and electrophysiological indices of temporal processing dysfunction in schizophrenia
Deana B Davalos1, Michael A Kisley, Robert Freedman
1Department of Psychology, Colorado State University, Fort Collins, CO 80523, USA. Davalos@ColoState.Edu
The Journal of Neuropsychiatry and Clinical Neurosciences
|January 3, 2006
Summary
Schizophrenia patients show deficits in behavioral time judgments but not in preattentive auditory processing (Mismatch Negativity - MMN) for easy stimuli. This suggests distinct neural mechanisms underlie these timing impairments.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Science
Background:
- Timing deficits are common in schizophrenia, but the underlying mechanisms, including inattention, remain unclear.
- Mismatch Negativity (MMN) offers a direct electrophysiological measure of stimulus processing, potentially bypassing attentional confounds.
Purpose of the Study:
- To investigate the relationship between behavioral time judgment accuracy and MMN responses in individuals with schizophrenia.
- To differentiate the impact of task difficulty on MMN and behavioral time processing.
Main Methods:
- Participants with schizophrenia and healthy controls completed two MMN paradigms (easy/difficult deviant) and a matched behavioral time processing task.
- MMN amplitude and behavioral error rates were analyzed and compared between groups and conditions.
Main Results:
- Schizophrenia patients showed reduced MMN amplitude only for the difficult deviant stimulus compared to controls.
- Patients made significantly more errors on the behavioral time processing task across all difficulty levels.
- A dissociation was observed between electrophysiological and behavioral measures of time processing.
Conclusions:
- Behavioral timing impairments in schizophrenia may involve processes distinct from those indexed by preattentive MMN.
- MMN may be a more robust measure of early sensory processing in schizophrenia, less affected by attentional deficits than behavioral tasks.