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Department of Psychiatry, University of Texas Health Sciences Center, Houston.
In a paired click "conditioning (S1), Testing (S2)" paradigm the amplitudes of responses to (S1) as well as the degree of attenuation of S2 as compared to S1 (S2/S1) were studied in two schizophrenic groups. Thirteen undifferentiated/disorganized (US) and thirteen paranoid (PS) patients were compared to thirteen age and sex matched normal volunteers. The US patients had significantly lower (S1) response amplitudes (P less than 0.001), as well as degree of attenuation of the response to (S2) (P less than 0.001) than the other two groups. No significant differences were found between the PS and N groups. Our data replicates the prior finding of decreased attenuation of the amplitude of the P50 wave in a paired click paradigm in schizophrenia. In addition, we showed that this phenomenon is significant mainly in the disorganized/undifferentiated patients as compared to the paranoid schizophrenics.
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