Search PubMed⌕ Search

Biomedical subjects

T V Mel'kovskaia

Publications and source records attributed to T V Mel'kovskaia.

6 recordsLinked to original sources
PubMed1983

[Reactions of the tectum neurons of the frog to movement into its field of vision of an object with different velocities].

Neurons with different "velocity selectiveness" and different "velocity sensitivity" were found in the frog midbrain tectum as well as neurons with different types of the firing rate dependence on the velocity of a visual stimulus motion. Visual recognition in frogs seems to proceed with the aid of two systems: the image--detecting and the image--describing those which complement each other.

Animals↗
PubMed1982

[Visual information coding in the frog midbrain tectum].

Possible mechanisms of optic information encoding in the frog tectum are considered on the basis of the extracellular recording of the tectum neuron impulse activity. It is suggested that optic information is coded in the frog tectum by means of space coding and is made more precise with the help of different types of time-coding, the coding by latency difference being used more widely. This mechanism may function either independently or be a component of complex time-codings. A uniform distribution in the tectal structures of neurons processing optic information indicates that the mechanism of exact analysis of optic stimulus movement parameters should be a distribution function of the same structures.

Animals↗
PubMedDate not supplied

[Spatial-temporal coding of simultaneously entering information on several visual signal signs by frog brain neurons].

Experiments were performed on frogs. It was shown that 9 neuron types with narrow- and wide-band sensitive characteristics were present in the tectum. These neurons used different modifications of spatio-temporal codes for transfer information about three features of a moving visual object--its orientation, direction and speed. There are proposed conceptual models of neural networks which perform analysis of the visual object orientation, direction and speed of its movement. These models include conceivable structures composed of narrow- and wide-band neurons which "calculate" the parameters of a visual signal through "synaptic interplay" of excitatory and inhibitory inputs based on their different weights on the "recognitive" ("calculative") neuron membrane.

Animals↗