The A ref-dependent changes in A max, A min were used, respectively, to quantitate dilation and constriction. A comparison of the predicted and observed period of pupil cycling suggests that the latency times for light onset and offset are the same. Measurements of A max, A min provide a ...
P., 2014, "Fractal Images Induce Fractal Pupil Dilations and Constrictions," Int. J. Psychophysiol., 93(3), pp. 316-321.Moon P., Muday J., Raynor S., Schirillo J., Boydston C., Fairbanks M.S., et al., Fractal images induce fractal pupil dilations and constrictions. Int J ...
As shown inFigure 4.9,pupil dilationcan be used to measure task difficulty. Participants interacted with a web-based TV diary tool: one had difficulty accessing the search function (shown in red), and the other had no difficulty (shown in blue). The participant who had difficulty had greate...
Pupil dilation has been reliably identified as a physiological marker of consciously reportable mental effort. This classical finding raises the question of whether or not pupil dilation could be a specific somatic signature of conscious processing. In order to explore this possibility, we engaged healt...
Conversely, relaxation can result in pupil constriction. Pupil anatomy is also fairly straightforward. Pupil contraction and dilation are controlled by two smooth muscles of the iris. The pupillary reflex is what allows the pupil to constrict and dilate involuntarily. It is important to remember the...
Stimulation of these regions of the hypothalamus results in pupil dilation while lesioning this region results in miosis (pupil constriction) and reduction of pupillary reflex dilation (Sano et al., 1970; Kalyanraman, 1975; Koss et al., 1984; Duan et al., 1996; Grujic et al., 2023). It...
(displaced-lines stimuli), to all stimulus types, both white and black. As expected, the pupil constricted for white-dot stimuli and dilated for black-dot stimuli. The light-evoked constriction was predictably faster than the dark-evoked dilation21, but combining the two (by subtracting the ...
Nuruki, K. Yunokuchi Department of Bioengineering, Kagoshima University, Kagoshima, JAPAN Introduction: It is widely accepted that the constriction and dilation of the pupils is evoked by changes in the ambient luminance and it has been shown that signals in the cone-opponent mechanism also ...
Additional enhanced PLR metrics (higher average constriction velocity, 3.08 mm/s vs 2.50 mm/s; difference, 0.58; 99.4% CI, 0.36-0.81), peak constriction velocity (4.88 mm/s vs 3.91 mm/s; difference, 0.97; 99.4% CI, 0.63-1.31), average dilation velocity (1.32 mm/s vs 1.22 mm/s, ...
Rather, the pupil diameter increased slightly, and this pupil dilation developed gradually without clear latency locked to the stimulus onset (see Fig. 2a, "small disk" at "BS"). This effect could be attributed to autonomic responses mediated by arousal signals conveyed by sympathetic nerves,...