[Responses of neurons of the lateral geniculate body in the cat to moving photic stimuli of graded intensity].

The stimuli consisted of 8 steps-stripes with stepwise changing intensity (I). The magnitude of one step (delta I) was 0.5 lg un. under the condition: delta I/I = Const. The value of neuronal responses to stripes of stepwise increasing intensity moving across the neurons' receptive fields did not change within a wide range of intensities provided the speed of moving was slow (up to 15-20 degrees/sec), but it augmented with an increasing intensity if the speed was 20-60 degrees/sec. In further increase of the speed the responses occurred in some cells within a narrow range of I values. These characteristics of the responses were also regarded in changes of the total light intensity of a stimulus within the range 3 lg un. Both on-responses of on-central neurons and off-responses of off-central neurons were analysed. The data obtained revealed that neuronal responses to moving stimuli with stepwise changing intensity depended qualitatively on the light intensity as much as the responses to stationary stimuli of different brightness, i.e. the value of responses to changes of the light intensity of a moving stimulus followed the Weber-Fechner law.