Abstract
Periodic photic stimuli across the entire electroencephalographic (EEG) frequency range were used in an attempt to assess EEG functional differences between chronic schizophrenic patients and control subjects. The EEG responses to these photic stimuli were significantly attenuated in the schizophrenic patients, specifically at the frequencies within the EEG alpha range. The schizophrenic patients also showed an alpha range attenuation in the “no stimulus” EEG alpha measure, such that there was a significant correlation across subjects between the “stimulus” and “no stimulus” EEG alpha range abnormalities. These abnormalities are discussed with reference to possible dysfunctional thalamic mechanisms involved in the pacing of EEG alpha activity and the gating of information through the cerebral cortex.
Highlights
“stimulus” and “no stimulus” EEG alpha range abnormalities
This article describes a preliminary study of EEG photic driving in chronic schizophrenia
It was designed to determine (I) if the EEG measures at the stimuli frequencies in patients and controls differed as a function of photic driving more than as a function of the resting EEG and (2) if this effect was concentrated in the alpha range
Summary
“stimulus” and “no stimulus” EEG alpha range abnormalities. These abnormalities are discussed with reference to possible dysfunctional thalamic mechanisms involved in the pacing of EEG alpha activity and the gating of information through the cerebral cortex. This yielded an estimate of the integrated RMS amplitude in microvolts for the EEG response at a particular stimulus frequency.
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