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.
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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|Item Type:||Journal Article|
|Additional Information:||For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: firstname.lastname@example.org|
|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 www.blackwell-synergy.com|
|Deposited On:||04 May 2007 00:00|
|Last Modified:||12 Nov 2012 23:13|
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