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Abstract
Schizophrenics have been observed to process information slower than normal individuals.
The present study evaluated spatiotemporal information processing by schizophrenics
and normal controls by means of a contrast sensitivity task. Spatial frequency gratings
(0.9, 3.8, 15 cycles/degree), temporally modulated at 0.0 stationary, 0.8, 3.25, 6.5,
and 26.0 Hz, were presented to evaluate whether or not schizophrenics are deficient
in processing patterns or temporal information. While the patterns were increasing
linearly from 0% to to 30% contrast, the subjects were required to discern when pattern
or temporal changes first occurred. A multivariate Analysis of Variance revealed that
schizophrenics were poorer at detecting temporal changes between 3.25 and 6.5 Hz,
whereas they were able to detect patterns better on the low and poorer on the high
spatial frequencies compared to normals. No differences were obtained for the stationary
pattern. These results are discussed in terms of abnormal sensory gating occurring
during the critical duration of temporal integration.
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Article info
Publication history
Received in revised form:
December 1,
1986
Received:
August 15,
1986
Identification
Copyright
© 1987 Society of Biological Psychiatry. Published by Elsevier Inc.
