Human scotopic spatiotemporal sensitivity: a comparison of psychophysical and electrophysiological data

The aim of the study was to investigate spatiotemporal visual functions under scotopic and photopic conditions in order to acquire human psychophysical and electrophysiological data that are comparable with contrast sensitivities based on single-unit recordings in animal experiments. Static and dyna...

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Bibliographic Details
Published in:Documenta ophthalmologica Vol. 106; no. 2; pp. 201 - 207
Main Authors: Benedek, György, Benedek, Krisztina, Kéri, Szabolcs, Letoha, Tamás, Janáky, Márta
Format: Journal Article
Language:English
Published: Dordrecht Springer 01.03.2003
Springer Nature B.V
Subjects:
Adolescent
Adult
Biological and medical sciences
Contrast Sensitivity - physiology
Dark Adaptation - physiology
Evoked Potentials, Visual - physiology
Eye and associated structures. Visual pathways and centers. Vision
Female
Fourier Analysis
Fundamental and applied biological sciences. Psychology
Humans
Male
Psychophysics
Sensory Thresholds
Vertebrates: nervous system and sense organs
Human
Magnocellular neuron
Healthy subject
Electrophysiology
Visual evoked potential
Exploration
Psychophysics
contrast sensitivity
Scotopic vision
Visual system
Electrodiagnosis
Sensitivity
magnocellular pathway
Visual pathway
Physiology
Photopic vision
visual evoked potentials
Comparative study
ISSN:0012-4486, 1573-2622
Online Access:Get full text
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Summary:The aim of the study was to investigate spatiotemporal visual functions under scotopic and photopic conditions in order to acquire human psychophysical and electrophysiological data that are comparable with contrast sensitivities based on single-unit recordings in animal experiments. Static and dynamic contrast sensitivities (CSs) and steady-state visual evoked potentials (VEPs) were measured under photopic and scotopic conditions in healthy volunteers. The results from the CS experiment indicated that the inclusion of temporal modulation and the application of scotopic luminance levels uniformly resulted in a relatively increased sensitivity for low spatial frequencies. Similarly, analysis of the second harmonic component of the VEPs demonstrated a shift from band-pass to low-pass functions. These results suggest that, under scotopic conditions, human visuospatial processing is characteristically predominated by the functional activity of the magnocellular pathways.
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ISSN:0012-4486
1573-2622
DOI:10.1023/A:1022548013313