Achromatic impulses unmask L- and M-cone adaptive mechanisms

Zele, Andrew J. & Vingrys, Algis J. (2001) Achromatic impulses unmask L- and M-cone adaptive mechanisms. Clinical and Experimental Ophthalmology, 29(3), pp. 197-200.

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The mechanisms underlying the adaptive response for achromatic impulses seen on achromatic fields were investigated. Foveal thresholds were measured for a static probe-impulse under two conditions of adaptation.Thresholds were obtained under gain-clamped conditions after observers had reached steady-state adaptation and with a probe-flash paradigm. It was found that thresholds isolated on steady-state fields cannot be modelled using a single mechanism. Likewise, the probe-flash condition failed to reflect the response of a single mechanism. Both threshold functions showed distinct breaks occurring at about the same field luminance(approximately 1.0 log cd/m2). Optimum data fits required the incorporation of two mechanisms implying the existence of independent processes mediating detection. Chromatic isolation confirmed that differential adaptation had been unmasked in the long- and medium-wavelength sensitive cone inputs to the achromatic channel.

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ID Code: 7479
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal’s website (see link) or contact the author. Author contact details:
DOI: 10.1046/j.1442-9071.2001.00403.x
ISSN: 1442-6404
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2001 Blackwell Publishing
Copyright Statement: The definitive version is available at
Deposited On: 04 May 2007 00:00
Last Modified: 12 Nov 2012 23:13

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