Mechanistic modeling of vertebrate spatial contrast sensitivity and acuity at low luminance : WestminsterResearch

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Title	Mechanistic modeling of vertebrate spatial contrast sensitivity and acuity at low luminance
Authors	Jarvis, J. and Wathes, C.M.
Abstract	The validity of the Barten theoretical model for describing the vertebrate spatial contrast sensitivity function (CSF) and acuity at scotopic light levels has been examined. Although this model (which has its basis in signal modulation transfer theory) can successfully describe vertebrate CSF, and its relation to underlying visual neurophysiology at photopic light levels, significant discrepancies between theory and experimental data have been found at scotopic levels. It is shown that in order to describe scotopic CSF, the theory must be modified to account for important mechanistic changes, which occur as cone vision switches to rod vision. These changes are divided into photon management factors [changes in optical performance (for a dilated pupil), quantum efficiency, receptor sampling] and neural factors (changes in spatial integration area, neural noise, and lateral inhibition in the retina). Predictions of both scotopic CSF and acuity obtained from the modified theory were found to be in good agreement with experimental values obtained from the human, macaque, cat, and owl monkey. The last two species have rod densities particularly suited for scotopic conditions.
Journal	Visual Neuroscience
Journal citation	29 (3), pp. 169-181
ISSN	1469-8714
Year	May 2012
Publisher	Cambridge University Press
Digital Object Identifier (DOI)	https://doi.org/10.1017/S0952523812000120
Published	May 2012

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Mechanistic modeling of vertebrate spatial contrast sensitivity and acuity at low luminance

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