[Electrophysiologic studies of the pathways of visual afferentation in the forebrain of the dogfish Squalus acanthias].

Afferent visual projections to the pallium of the telencephalon have been investigated in immobilized conscious dogfish Squalus acanthias using electrophysiological recording the evoked potentials and neuronal reactions elicited by electric stimulation of the optic nerve. Analysis and comparison of the parameters of the components of the evoked potentials in the telencephalon and tectum opticum indicate the existence of two visual subsystems (the retino-thalamo-telencephalic and the retino-tecto-thalamo-telencephalic ones) in the dogfish.