Flicker sensitivity as a function of the spectral density of external white temporal noise

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Vision Research. 1996. 36: 3767-3774

Title: Flicker sensitivity as a function of the spectral density of external white temporal noise
Author: Rovamo, J.,; Raninen, A.,; Lukkarinen, S.,; Donner, K.
Contributor organization: Department of Biological and Environmental Sciences
Bio- ja ympäristötieteiden laitos
Bio- och miljövetenskaper, Institutionen för
Publisher: Elsevier
Date: 1996
Language: eng
ISSN: 0042-6989
DOI: http://dx.doi.org/doi:10.1016/0042-6989(96)00108-3
URI: http://hdl.handle.net/1975/939
Abstract: Foveal flicker sensitivity at 0.5–30 Hz was measured as a function of the spectral density of external, white, purely temporal noise for a sharp-edged 2.5 deg circular spot (mean luminance 3.4 log phot td). Sensitivity at any given temporal frequency was constant at low powers of external noise, but then decreased in inverse proportion to the square root of noise spectral density. Without external noise, sensitivity as function of temporal frequency had the well-known band-pass characteristics peaking at about 10 Hz, as previously documented in a large number of studies. In the presence of strong external noise, however, sensitivity was a monotonically decreasing function of temporal frequency. Our data are well described (goodness of fit 90%) by a model comprising (i) low-pass filtering by retinal cones, (ii) high-pass filtering in the subsequent neural pathways, (iii) adding of the temporal equivalent of internal white spatiotemporal noise, and (iv) detection by a temporal matched filter, the efficiency of which decreases approximately as the power −0.58 of temporal frequency.
Subject: Flicker sensitivity
Temporal noise
Human visual system
Signal processing

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