[Dynamics of evoked responses in the visual cortex of intact and callosotomized cats to visual stimuli of different...

The comparison of histograms of distribution of monocular and binocular EPs amplitudes in the striate and parastriate cortex of intact and callosectomized cats with the corresponding histograms of intensities of random light flashes revealed a transformation of stimuli distribution function. In intact animals, EPs distribution was characterized by a left-side asymmetry and predominance of mean-amplitude EPs. It is suggested that the above distribution characteristics reflect the principle of optimization. Its presence as well as characteristics of its manifestation in definite visual areas and with different types of stimuli lateralization are largely due to transcallosal influences modulating the value and power spectrum of thalamocortical excitation.