Geometrical optical illusion quantities for five famous illusion figures were psychophysically measured when stimulus conditions for subjects were controlled as follows;
(1) Visual fields of subjects were effectively restricted to small area in the central part of the retina using the
television
eye
camera system.
(2) Illusion figures were presented on the peripheral part of subject's retina.
(3) Illusion figures were also instantaneously presented to subjects at very small time intervals.
Results obtained in these experiments showed the points cited below.
(1) Geometrical optical illusion quantities are consistent whether stimuli are simultaneously or successively received by subject's retina.
(2) Geometrical optical illusion quantities increase when stimuli are presented on the peripheral part of retina.
(3) And geometrical optical illusion quantities are consistent even if the presentation time intervals of the stimuli are shortened to very small values.
These data mentioned above do not always correspond to so-called field theories and neural network models of the lateral inhibition or the receptive field for the geometrical optical illusion phenomena.
It is concluded in this paper that a mechanism of generation of the geometrical optical illusion phenomena is not expressed as a function of simultaneous process in the peripheral nervous system but a function of complex process in the central nervous system.
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