Directionally Selective Units in the Cat’s Lateral Geniculate Nucleus
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Optic nerve fibres of the cat generally have receptive fields of either on-centre or off-centre type. They have been further classified into Type-I fibres which only respond transiently to an increase or a decrease of luminance in their receptive field centre (phasic type), and Type II fibres continue to respond to a spot of light or to a dark spot until the spot is removed (tonic type). The average conduction velocity of Type-I fibres is faster than that of Type-II fibres (Fukada, 1971; Fukada and Saito, 1971; Saito et al., 1970).
KeywordsReceptive Field Lateral Geniculate Nucleus Concentric Type Optic Nerve Fibre Receptive Field Centre
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