blink reflex


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blink response

a response elicited during nerve conduction studies, consisting of muscle action potentials evoked from orbicularis oculi muscles after brief electric or mechanical stimuli to the cutaneous area supplied by the ophthalmic branch of the trigeminal nerve. Characteristically, there is an early response (approximately 10 msec after stimulus) ipsilateral to the stimulation site (labeled R1) and bilateral late responses (approximately 30 msec after stimulus; labeled R2); the latter are responsible for the visible twitch of the orbicularis oculi muscles.

blink re·sponse

, blink reflex (blingk rĕ-spons', rē'fleks)
A response elicited during nerve conduction studies, consisting of muscle action potentials evoked from orbicularis oculi muscles after brief electric or mechanical stimuli to the cutaneous area supplied by the ophthalmic branch of the trigeminal nerve. Characteristically, there is an early response (approximately 10 msec after stimulus) ipsilateral to the stimulation site (labeled R1) and bilateral late responses (approximately 30 msec after stimulus; labeled R2); the latter are responsible for the visible twitch of the orbicularis oculi muscles.
References in periodicals archive ?
Nociceptive blink reflex and pain related evoked potentials in hypnic headache.
Nobbe, "Prepulse modulation of the startle reaction and the blink reflex in normal human subjects," Experimental Brain Research, vol.
However, Figure 3 shows that the highest Blink reflex ratios were observed in the Puff + Blink condition.
Does emotion modulate the blink reflex in human conditioning?
In an experiment, Dr Chiara Sambo and lead author Dr Giandomenico Iannetti from UCL recorded the blink reflex - a defensive response to potentially dangerous stimuli at varying distances from subject's face.
The RSV-150 Remote Sensing Vibrometer will measure vibrations and displacements on nearly any surface, from up to more than 300 meters away using an eyesafe (subject to blink reflex) Class 2 laser.
A successful crush was confirmed in each animal by observing complete loss of the blink reflex, flattening of vibrissae orientation, and paralysis of vibrissae movement.
It is not confirmed whether previous laser refractive surgery predisposes to this condition but other reviews have found corneal nerves are severed during the LASIK procedure producing an abnormal blink reflex. This may aggravate a pre-existing dry eye condition.
In tension-type headache (TTH), central mechanisms are the major factors.1,2 Blink reflex (BR) is an objective neurophysiologic assessment method for trigeminal system, facial nerve and lateral medulla status.3,4 Afferent arc of BR is formed by the sensation fibers of trigeminal nerve while efferent arc is formed by motor nerve fibers.5-8 BR occurs with electrical or mechanical stimulation of supraorbital nerve and includes three responses: Early response is the ipsilateral response to the stimulation (R1), and two late responses are the ipsilateral and contra lateral responses (R2i and R2k).9 R1 is a cutaneous originated oligosynaptic reflex, which is transported by trigeminal afferent nerve fibers.