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Biomedical subjects

Iu D Kropotov

Publications and source records attributed to Iu D Kropotov.

At least 19 recordsLinked to original sources
PubMed1997

[Striatal function in action selection].

A review of neurophysiological studies of human goal-directed behaviour performed with the aid of indwelled electrodes in Parkinsonian and epileptic patients. Functional role of the thalamo-cortical circuits is discussed.

Attention↗
PubMed1990

[Changes in the flux frequency of the neuronal discharges of human subcortical brain structures related to the organization of motor acts].

16 Parkinsonian patients (6 females) with depth electrodes within striopallido-thalamic system implanted for diagnostic and therapeutic purposes, voluntarily participated in four psychological tests. Two groups of the pallidal and thalamic neuronal populations (response- and stimulus-related neuronal populations) were distinguished on the basis of evoked responses in the motor odd ball test. Response-related neurons were in turn separated into several subgroups according to their reactions in the delayed-response tasks. Some of these neuronal populations reacted preferentially to counting, some--to naming, some--to pressing button.

Brain↗
PubMed1984

[Component analysis of the reactions of neuronal populations in the human brain during the memorizing of visual stimuli].

The components of the evoked impulse activity of neurons and neuronal populations were studied in different nuclei of the thalamus and strio-pallidar system of the human brain, in patients treated with indwelled electrodes. The impulse activity was recorded during recognition of polygonal shapes with and without semantic meaning, during memorizing of visual stimuli without meaning. Peri-stimulus-time histograms for the cases of presentations of familiar and unfamiliar patterns, for the cases of stimulus presentation in the initial and terminal parts of the memorizing were computed and compared with each other. In some neuronal populations, a group of late components was revealed, altering during learning and depending upon subject evaluation of the meaning of the stimulus.

Brain↗