[Neuronal level of visual analysis organization in the frog tectum]

Using coupled microelectrode studies of the frog tectum neuronal responses to diffuse light or moving visual stimulus, the excitatory-inhibitory constructions were revealed in the midbrain tectum. The size of excitatory areas of these constructions is about 100-200 mu with intevening inhibitory areas. It proved possible to find a correlation between the size of the excitatory tectal constructions appearing in different types of visual stimulation and the width of the branching areas as well as the site of terminals of the visual afferents and intratectal fibers.