Reactivated response of blink reflex in the cat.

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Abstract
Three reflex responses in the orbicularis oculi muscles were observed by electrical stimulation of the trigeminal nerve in lightly anesthetized or conscious cats. The 3rd response, following the 1st and 2nd responses, was concluded as being a reactivated response of the blink reflex as it was set up by the trigeminal afferent input evoked by the palpebral movement of the preceding blink. The 3rd response disappeared on administration of muscle relaxants and was enhanced by touching the palpebral hair. The palpebral movement activated the afferent discharges of the trigeminal exteroceptors which were strong enough to yield the reflex responses. The latency of the 1st reflex response by the palpebral movement corrresponded to the time lag between the preceding large reflex response and the 3rd response. The 3rd response was hardly suppressed at all until the 1st response disappeared over a period of maximum reflex suppression following the conditioned stimulation of the trigeminal nerve.

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