[A method for the multiple implantation of semimicroelectrodes into the brain of small animals for research in free behavior].
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Animals↗
Biomedical subjects
S A Chebkasov
Publications and source records attributed to S A Chebkasov.
[Off and on stimulation exerts a contrary action on the functional status of the human brain].
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Brain↗
[The hypercolumns of the guinea pig visual cortex. The heterogeneity and multilevel topical organization of the projections].
Spatial distribution of neural responses to spots, slits, and bars in the guinea pig visual cortex reveals hypercolumns like those in the brain of higher mammals. The regular heterogeneities of topic projections within and between hypercolumns (reflected in a distribution of focal potentials in different cortical areas) suggest that the described columns are discrete cortical zones (or macromodules) about 0.6 mm in size. They consist of 7-10 on/off polar orientation micromodules about 0.2 mm in size. In turn, the latter also have the inner topical organization of their projections. Consequently, the described topical projections have a multilevel hierarchical organization of accordance with different complicity of neural structures. Taking into account the known polar structure of hypercolumns we think that it provides a possibility of comparison between the vectors of signals and polar structures. There are reasons to believe that this is a principle condition for signal recognition.
Animals↗
[The tangential segregation of simple and complex cells in the visual cortex and their connections. The universal neocortex modulus].
Guinea-pig studies testify that in rodents (like in higher mammals) the primary afferents from the thalamus and inferior cortical afferents converge on discrete columns about 200 mcm in size with zones of secondary convergence between them. The cortical columns seem to be primary basic and universal cortical modules, since they have similar dimensions and uniform organization in different mammals. The columns concentrate simple cells (with complex ones among them) and afferent inhibitory neurons; these models are involved in the first stage of cortical integration. Local connections of the primary modules differ from those of the secondary intermediary zones, which are poor narrow in rodents. The intermediary zones progressively develop in phylogeny, and in higher mammals they excel the primary modules in dimensions.
Afferent Pathways↗