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Your search keyword '"Y. Fukada"' showing total 8 results
Start Over Author "Y. Fukada" Journal vision research
8 results on '"Y. Fukada"'

1. Directionally selective units in the cat's lateral geniculate nucleus

Author

Y. Fukada and H. Saito

Subjects
Time Factors, Materials science, Neural Conduction, Optic chiasm, Visual system, Lateral geniculate nucleus, Nerve conduction velocity, Functional Laterality, Tonic (physiology), Neural Pathways, Reaction Time, medicine, Animals, Visual Pathways, Visual Cortex, Brain Mapping, Geniculate Bodies, Optic Nerve, Anatomy, Sensory Systems, Electric Stimulation, Ophthalmology, medicine.anatomical_structure, Visual cortex, Receptive field, Optic Chiasm, Visual Perception, Optic nerve, Cats, Microelectrodes, Photic Stimulation
Abstract

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).

Published
1971

2. Gain control mechanisms in X- and Y-type retinal ganglion cells of the cat.

Author

Saito H and Fukada Y

Subjects
Action Potentials, Adaptation, Ocular, Animals, Cats, Photic Stimulation, Time Factors, Retina physiology, Retinal Ganglion Cells physiology
Abstract

A change in responsiveness caused by a spot of light (conditioning spot, CS; 3 sec in duration) presented within a central region of the receptive field of X- and Y-type retinal ganglion cells of the cat was investigated by measuring the magnitude of responses to another spot of light (test spot, TS; 50 msec in duration) which was juxtaposed with the CS within the same receptive field's central region. Responses to the TS were suppressed steadily during the on-phase of the CS as if it were divided by a certain value. This fact indicates that the gain of the center mechanism was changed by the CS presentation. The setting of the gain to a new level was rapid (within 100 msec after the onset or the cessation of the CS), and the magnitude of a gain change was not affected by the surround antagonism. These characteristics of the gain control were common to X- and Y-cells under both mesopic and scotopic levels of light adaptation.

Published
1986
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