This paper studies the excitability cycle of the early response to the blink reflex evoked in normal humans by the paired stimuli technique. The results show the presence of a period of early facilitation of the conditioned response lasting for intervals of 1–9 msec between the paired stimuli, followed by a period of inhibition of the response. A late facilitation is also present in some subjects. The late response of the constant blink reflex shows habituation. The proprioceptive nature of the early response of the reflex is discussed.

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