[Patterns of afferent signal convergence in the neurons of the frog midbrain tectum]

The activity of 168 optic tectum units was recorded in conditions of separate and combined actions of light, sound, and pain stimuli. The sensitivity of the neurons to multisensory convergence depended on their spontaneous activity. Excitatory--inhibitory characteristics of responses to unspecific stimuli in most cases were similar to specific responses. Combined action of different stimuli complicated and increased the number of response types.