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PubMed1999

[Effect of the NMDA receptor antagonist on parameters of delayed visual differentiation and rearrangement of the impulse activity of neurons in visual and prefrontal cortices in monkeys].

With the aid of a multichannel leads the unit activity was recorded in the 17th and 8th cortical fields along with registering behavioural data in Rhesus monkeys. Multi-factor variance analysis revealed that the 2-amino-5-phospho-valeric acid (APV) effect involved a significant worsening of the monkeys' behavioural characteristics: duration of the short-term memory shortened (2-4-fold), motor reactions' time increased, and the changes of cognitive characteristics were always followed by significant rearrangements of the unit activity in the above areas. The data obtained suggest that these cognitive dysfunctions are due to a desynchronisation of unit activity in different areas of the cortex including the neuronal assemblies maintaining the short-term memory mechanisms associated with the glutamatergic structures.

Animals↗
PubMed1975

[Quantitative architectonic variations in the visual cortex of mice following varying light exposure of the visual organ].

Quantitative - architectural investigations were carried through with two experimental groups of white mice. One group was expsed to a source of light day and night, the other group lived under normal light variations. The animals of both groups were already born under the mentioned conditions and killed in etherization after 51 days. After the determination of the brain-weights, which showed smaller quantities for the group living under light day and night, sections of 10 mum were stained according to the NISSL method and the thickness of the cortex was measured. The layers in the area striata were examined with regard to possible differences. But in this connection no differences between the two groups were to be found. According to the point - method the different coefficients of the cortical layers were determined. The mathematical - statistical analysis with the help of t-test showed significantly bigger coefficients with the latter group (living under light day and night). These coefficients correspond to a smaller part of volume of neurons or their components in a defined volume. This way it was proved that changed light conditions result in changes of the microscopical structure of the area striata. At the same time significant changes occur in the nucleus-plasma-relation of the various layers. These make us recognize the functional adaptations to the changed environmental influences.

Animals↗