[Structure of Response and Dynamics of Preferred Orientation in Cat's V1 Neurons].

Preferred orientation of V1 neurons was changed during the respons time course. In order to reveal mechanisms of such changes, spike trains of single neurons to flashed bars of different orientations were studied by means of principal component and frequency-domain analysis of the spike density functions. There was found out that: 1. contribution of each of the components was dependent on the stimulus orientation. 2. the principal components of V1 neurons responses contain different kinds of transient and sustained parts and rhythmic oscillations in the theta/alpha and beta-bands. 3. There was no correlation between transient parts as well as between rhythmic oscillations within the same frequency band in different components. Taken together, the data obtained allow us to suggest that during generation of response there is a shift of dominance of the components with different orientations which determines the dynamics of the preferred orientations of V1 neurons.