抄録
When a weak tone precedes a 110dB white noise, the acoustic eyeblink reflex to the latter stimulus is modified, depending upon the temporal parameters of the stimulus configuration. This phenomenon is called “lead-stimulation effect”. The purpose of this study was to clarify the turning point where the effect of the lead-stimulus upon the reflex changes from inhibitory to facilitatory, and to verify the hypotheses of facilitation effect proposed by Graham (1975). In Exp. I, nine undergraduates were tested with a variable ISI design. The results showed that the turning point was around 400msec or less in ISI. In Exp. II, 36 undergraduates were tested with a fixed ISI design. The results indicated that Graham's hypotheses were valid.
