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Effects of absolute luminance and luminance contrast on visual search in low mesopic environments.
- Source :
- Attention, Perception & Psychophysics; Jul2018, Vol. 80 Issue 5, p1265-1277, 13p
- Publication Year :
- 2018
-
Abstract
- Diverse adaptive visual processing mechanisms allow us to complete visual search tasks in a wide visual photopic range (>0.6 cd/m<superscript>2</superscript>). Whether search strategies or mechanisms known from this range extend below, in the mesopic and scotopic luminance spectra (<0.6 cd/m<superscript>2</superscript>), has yet to be addressed. Based on a study that addressed simple target discrimination in luminance environments using contrast-dependent behavioral efficiency functions, we assessed visual search in more complex-feature and conjunction-search paradigms. The results verify the previously reported deficiency windows defined by an interaction of base luminance and luminance contrast for more complex visual-search tasks. Based on significant regression analyses, a more precise definition of the magnitude of contribution of different contrast parameters. Characterized feature search patterns had approximately a 2.5:1 ratio of contribution from the Michelson contrast property relative to Weber contrast, whereas the ratio was approximately 1:1 in a serial-search condition. The results implicate near-complete magnocellular isolation in a visual-search paradigm that has yet to be demonstrated. Our analyses provide a new method of characterizing visual search and the first insight in its underlying mechanisms in luminance environments in the low mesopic and scotopic spectra. [ABSTRACT FROM AUTHOR]
- Subjects :
- VISUAL perception
VISUAL discrimination
COLOR
REGRESSION analysis
SPECTRUM analysis
Subjects
Details
- Language :
- English
- ISSN :
- 19433921
- Volume :
- 80
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Attention, Perception & Psychophysics
- Publication Type :
- Academic Journal
- Accession number :
- 130551532
- Full Text :
- https://doi.org/10.3758/s13414-018-1512-0