Abstract
The relation between stimulus and visual sensation was studied with special reference to the endurance of the latter.1) The duration from the beginning of the primary sensation to the end of the negative after-image was always about 520 msec. while duration of light stimulus varied from 4.0 to 220 msec. in the state ofdark adaptation and dark surrounding field. This duration was also not affected by intensity of stimulus.2) The primary sensation lasted 77 msec. with light stimulus lasting from 4.0 to 150 msec.3) The primary sensation was prolonged stepwise progressively when light stimulus lasted over 155 msec. The duration of the former was approximately half the final length of stimulus.4) The primary sensation was also prolonged when light stimulus was very weak. This appears not to be due to summation, but have some relation to negative after-image.
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