Conditioned eyelid movement is not a blink.

Journal of Neurophysiology
Alice Schade PowersCraig Evinger

Abstract

Based on kinematic properties and distinct substrates, there are different classes of eyelid movement described as eyeblinks. We investigate whether the eyelid movements made in response to a conditioned stimulus (CS) are a category of eyelid movements distinct from blinks. Human subjects received 60 trials of classical eyelid conditioning with a tone as the CS and electrical stimulation of the supraorbital branch of the trigeminal nerve as the unconditioned stimulus (UCS). Before and after training, reflex blinks were elicited with the UCS. The kinematics of conditioned responses (CRs) differed significantly from those of reflex blinks. The slope of the amplitude-maximum velocity function was steeper for reflex blinks than for CRs, and reflex blink duration was significantly shorter than CR duration. Unlike reflex blinks, for which maximum velocity was independent of blink duration, the maximum velocity of CRs depended on CR duration. These quantitative and qualitative differences indicated that CRs were a unique class of eyelid movements distinct from blinks and eyelid movements with vertical saccadic gaze shifts.

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Citations

Oct 5, 2011·Learning & Memory·John H Freeman, Adam B Steinmetz
Oct 22, 2010·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Joy C Kreider, Michael D Mauk
Feb 27, 2013·Clinical Ophthalmology·John D RodriguezMark B Abelson
Sep 17, 2013·Perceptual and Motor Skills·Toshiko SugiyamaHideoki Tada
Dec 7, 2017·Frontiers in Psychology·Manuela SchuetzeSigne Bray
Jan 16, 2020·Journal of Neurophysiology·Ashley CulosoCraig Evinger

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