Results 181 to 190 of about 10,398 (213)
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Diurnal Modulation of Pupillary Light Reflex
Light & Engineering, 2023Pupillary light reflex is mediated by intrinsic photosensitive retinal ganglion cells (ipRGCs) and the midbrain in human brain. The cells ipRGCs are highly sensitive to blue light (~ 480 nm). In this study, we evaluated diurnal changes in chromatic sensitivity of ipRGCs by measuring pupillary light reflex.
Ryuma Senba, Yu Maruyama, Motoharu Takao
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Critical Duration for the Pupillary Light Reflex*
Journal of the Optical Society of America, 1969Light reflexes of the eye pupil are measured with an infrared scanning pupillometer in response to a 74-deg field. At threshold, the pupillary system responds to stimulus energy for short flashes and stimulus magnitude for long flashes. On a plot of log-flash magnitude vs log-flash duration, the intersection of the constant-energy asymptote and the ...
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The neuronal pathway subserving the pupillary light reflex
Brain Research, 1978The pupillary light reflex was investigated using electrical stimulation along the pathway and recording in the short ciliary nerves. The discharge of single units in the ciliary ganglion was compared during diffuse light stimuli and electrical stimuli.
H, Hultborn, K, Mori, N, Tsukahara
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The pathway controlling the pupillary light reflex in urodeles
Experimental Brain Research, 1994Although the photomechanical response of the iris in amphibians has been characterized, the central pathway of reflex control is unknown. We investigated this pathway by electrophysiological and anatomical techniques in urodeles. Sustained responding neurons in the pretectum were localized and characterized.
J, Henning, W, Himstedt
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Neuroticism and the Effect of Stress on the Pupillary Light Reflex
Perceptual and Motor Skills, 1979The pupillary light reflex was recorded under control, stress and fatigue conditions for 30 subjects equally divided into groups low, moderate, and high in Neuroticism. The effects of stress were distinguished by a decrease in both latency and extent of pupillary constriction during the initial light stimulation trials, as well as by a greater ...
L, Plouffe, R M, Stelmack
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The Pupillary Light Reflex Effects of Anesthetics and Hyperthermia
Anesthesiology, 1993The pupillary light reflex often is evaluated in the perianesthetic period to assess drug effects and brainstem function. Mild hypothermia alone or combined with isoflurane does not impair pupillary responses. Although perioperative hyperthermia is less common than hypothermia, abnormal increases in core temperature remain an important thermal ...
K G, Belani +8 more
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Response anisocoria in the pupillary light and darkness reflex
European Journal of Neuroscience, 2018Abstract The pupil constricts or dilates in response to a luminance increase or decrease, and these transient pupillary responses are controlled by the parasympathetic and sympathetic pathways. Although pupillary responses of the two eyes are highly correlated, they are not always identical (referred to as anisocoria).
Chin‐An Wang +3 more
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Asymmetry of the pupillary light reflex during a cold pressor test
Autonomic Neuroscience: Basic and Clinical, 2022Peter Drummond
exaly