Related Experiment Videos
Slower and more variable reaction times in schizophrenia: what do they signify?
S Vinogradov1, J H Poole, J Willis-Shore
1Department of Psychiatry, University of California, San Francisco, USA. sophia@itsa.ucsf.edu
Schizophrenia Research
|August 28, 1998
Summary
Schizophrenia patients exhibit slower reaction times and greater variability in task performance compared to healthy individuals. These cognitive differences are linked to symptom severity and functional impairments, suggesting distinct underlying mechanisms.
Area of Science:
- Cognitive Neuroscience
- Psychiatry
Background:
- Schizophrenia is associated with slower reaction times and increased variability in task performance.
- Previous research indicates potential links between these cognitive deficits and clinical symptoms.
Purpose of the Study:
- To investigate the relationship between mean choice reaction time (CRT) and intra-individual variability (CRT-SD) with psychiatric symptoms and executive-motor task performance in schizophrenia.
- To differentiate the cognitive and clinical correlates of mean CRT and CRT-SD.
Main Methods:
- A lexical decision choice reaction time (CRT) task was administered to 26 medication-free schizophrenic outpatients and 17 normal comparison subjects.
- Correlations were examined between CRT, CRT-SD, psychiatric symptoms, cognitive set maintenance, motor coordination, and global functioning.
Main Results:
- Schizophrenic subjects demonstrated significantly slower and more variable CRTs compared to controls, unrelated to IQ.
- Both CRT and CRT-SD were associated with symptom severity, impaired cognitive set maintenance, and poorer motor coordination.
- CRT-SD uniquely correlated with positive, disorganized, and tension/hostility symptoms, while mean CRT uniquely correlated with cognitive set maintenance and stereotypic mannerisms.
Conclusions:
- Slower mean CRT and increased CRT-SD in schizophrenia may reflect distinct aspects of cognitive and symptomatic dysfunction.
- These findings highlight the complexity of cognitive deficits in schizophrenia and their relationship to clinical presentation.