[Resistance of visual recognition to interference in the intact and callosotomized rat]

Recognition of structured visual stimuli under the action of light interference was studied by means of conditioning in rats with intact and dissected callosal body. Addition of noise to conditioned signals was achieved by insertion of additional element into their image. It was found that as more noise was added the number of correct responses decreased and latencies of conditioned food-procuring reactions became longer. The number of individuals in the sample, which possessed a differentiation level higher than the random one decreased. Noise immunity of males in the range of weak and average noises proved to be higher than in females, and, as a rule, equal at high noises. Section of the callosal body produced changes in noise immunity of visual recognition; the nature and degree of the changes depended on the intensity of noise and on the animal's sex. The existence of modulating callosal influences on noise immunity of visual recognition is suggested.