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Biomedical subjects

I A Korsakov

Publications and source records attributed to I A Korsakov.

17 recordsLinked to original sources
PubMed1988

[Psychophysiological characteristics of visual perception in patients with schizophrenia during polarization of the occipital and frontal cortices].

Purposeful change of the functional status of the occipital and frontal cortex in relation to distinguishing visual stimuli shows that one of the signs indicative of schizophrenia is impairment of the active component of the regulatory mechanism of perception mediating the psychological orientation toward the recognition of meaningful signals and related to functions of the frontal cortex. Analysis of the alterations in the index of importance (serving as a quantitative parameter of changes in the psychological orientation in cases of shifts of the frontal cortex status) have demonstrated that in schizophrenics, unlike in healthy subjects, there is no relationship between changes in the frontal cortex potential and regulation of the critical sphere of perception.

Electrodes↗
PubMed1988

[Functional and time structure of visual perception in schizophrenia].

A comparative analysis of situations of correct and erroneous perception of visual stimuli and of the dynamics of slow electrical activity of the occipital and frontal cortex has shown that schizophrenia is characterized by specific disorders of the functional and time structure of perception. One of the main signs of these disorders is dysfunction of the frontal cortex at the stages of the synthesis of the perceived information with traces of memory about similar impacts and subsequent categorization of the perceived information.

Action Potentials↗
PubMed1982

[Mechanisms regulating perception: regulation of sensation].

The slow electrical activity of the thalamic region of the cortex, as well as the psychophysical characteristics of perception were registered in experiments on discerning light flashes in brightness in healthy probands, excitable psychopathic subjects and schizophrenic patients (simple form with apatho-abulic manifestations). It is shown that correct perception of the light flashes depends on stabilization of the thalamic region potentials in the time intervals of 100 to 200 msec following immediately the stimuli. In cases of erroneous perception no stabilization of such kind was noted. A certain relationship between the perception characteristics and the time course of the slow electrical activity on the one hand, and the proband's intention to select pairs of flashes of different or equal intensity as the signal was registered. As a result, in cases of correct perception of the signal pair of the flashes the stabilization of the slow potential was more marked than in cases of perceiving non-signal pairs. This fact points to an active character of the physiological regulation of the visual analyzer sensitivity.

Antisocial Personality Disorder↗