Abstract
Background
We compared performance on a dichotic listening (DL) task between schizophrenic, depressed,
and healthy control subjects. A variant of the traditional DL paradigm was used in
which the subjects were required to focus attention either on the left (forced-left
condition) or right (forced-right condition) ear stimulus.
Methods
The subjects were 51 patients with a DSM-IV diagnosis of schizophrenia, 49 patients
with recurrent unipolar major depression, and 49 healthy control subjects. They were
tested with a consonant–vowel syllables dichotic listening task under three attentional
instructions.
Results
There was a significant overall right ear advantage during the nonforced condition,
which increased dramatically during the forced-right condition and was eliminated
during the forced-left condition. The depressed patients showed no signs of impairments
compared with the healthy control group. Thus, they showed a right ear advantage during
the nonforced and forced-right conditions, which was shifted to a left ear advantage
during the forced left condition. The schizophrenic patients, however, were impaired
on the forced-left condition compared with the healthy control and depressed subjects.
Conclusions
The results are discussed in terms of separating attentional and inhibitory executive
impairments in schizophrenia and depression, taking into consideration illness duration
and information-processing demands.
Keywords
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Article info
Publication history
Accepted:
August 2,
2002
Received in revised form:
June 20,
2002
Received:
March 20,
2002
Identification
Copyright
© 2003 Society of Biological Psychiatry. Published by Elsevier Inc. All rights reserved.
