Simultaneous processing of spatial and chromatic components of patterned stimuli by the human visual system A. JAVADNIA and K. H. RUDDOCK Department of Physics (Biophysics), Imperial College, London, SW72BZ, UK Received 1 February 1988; revised 9 April 1988; accepted 23 April 1988 Abstract-We report measurements on discrimination of orientation and magnification made for elements differentiated in colour and/or luminance from their background. By performing measurements at a series of background luminances and for fixed luminance of the elements, we show that with colour contrast, discrimination for both spatial parameters is unimpaired when the background is at isoluminance with the elements. Under simple luminance contrast, however, these discriminations become poorer when the background luminance is within some ± 5% of that of the elements, and are completely absent when the two values are the same. A deuteranomalous subject is unable to make the spatial discriminations around the isoluminance point for colour contrasts which are too small for him to distinguish, but for which subjects with normal colour vision maintain spatial discriminations at isoluminance. This observation establishes that the physiological mechanisms of normal colour vision, rather than stimulus artefacts, mediate the observed spatial discriminations. We conclude that the visual processing
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 1988
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