The effect of caffeine on spontaneous pupillary oscillations

2013 ◽  
Vol 34 (1) ◽  
pp. 73-81 ◽  
Author(s):  
Barbara Wilhelm ◽  
Gitta Stuiber ◽  
Holger Lüdtke ◽  
Helmut Wilhelm
Keyword(s):  
Pupillary Oscillations

scholarly journals Tracking the allocation of attention using human pupillary oscillations

2013 ◽  
Vol 4 ◽  
Author(s):  
Marnix Naber ◽  
George A. Alvarez ◽  
Ken Nakayama
Keyword(s):  
Pupillary Oscillations

scholarly journals Short-Term Monocular Deprivation Enhances Physiological Pupillary Oscillations

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Paola Binda ◽  
Claudia Lunghi
Keyword(s):  
Visual Perception ◽  
Binocular Rivalry ◽  
Latent Variable ◽  
Cortical Excitability ◽  
Ocular Dominance ◽  
Sensory Stimulation ◽  
Monocular Deprivation ◽  
Systematic Change ◽  
Short Term ◽  
Pupillary Oscillations

Short-term monocular deprivation alters visual perception in adult humans, increasing the dominance of the deprived eye, for example, as measured with binocular rivalry. This form of plasticity may depend upon the inhibition/excitation balance in the visual cortex. Recent work suggests that cortical excitability is reliably tracked by dilations and constrictions of the pupils of the eyes. Here, we ask whether monocular deprivation produces a systematic change of pupil behavior, as measured at rest, that is independent of the change of visual perception. During periods of minimal sensory stimulation (in the dark) and task requirements (minimizing body and gaze movements), slow pupil oscillations, “hippus,” spontaneously appear. We find that hippus amplitude increases after monocular deprivation, with larger hippus changes in participants showing larger ocular dominance changes (measured by binocular rivalry). This tight correlation suggests that a single latent variable explains both the change of ocular dominance and hippus. We speculate that the neurotransmitter norepinephrine may be implicated in this phenomenon, given its important role in both plasticity and pupil control. On the practical side, our results indicate that measuring the pupil hippus (a simple and short procedure) provides a sensitive index of the change of ocular dominance induced by short-term monocular deprivation, hence a proxy for plasticity.

scholarly journals Induced Pupillary Oscillations

1950 ◽  
Vol 34 (3) ◽  
pp. 180-189 ◽  
Author(s):  
F. W. Campbell ◽  
T. C. D. Whiteside
Keyword(s):  
Pupillary Oscillations

scholarly journals How do spontaneous pupillary oscillations in light relate to light intensity?

2009 ◽  
Vol 49 (3) ◽  
pp. 295-300 ◽  
Author(s):  
Max Warga ◽  
Holger Lüdtke ◽  
Helmut Wilhelm ◽  
Barbara Wilhelm
Keyword(s):  
Light Intensity ◽  
Pupillary Oscillations
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