[Role of specific and nonspecific afferent currents in forming evoked brain potentials to photic stimulation in the cat].

Evoked potentials during light stimulation were investigated in normal cats and after bilateral destruction of specific (the optical tracts, the lateral geniculate nuclei) and nonspecific (the brachia colliculi superioris) visual pathways. A component corresponding to the primary response was present in evoked potentials in all cases. It is concluded that photoinduced responses mainly depend on the quantity but not on the quality of the exciting afferent flow.