Contrast adaptation and contrast masking in human vision
- 22 October 1991
- journal article
- Published by The Royal Society in Proceedings Of The Royal Society B-Biological Sciences
- Vol. 246 (1315), 61-70
- https://doi.org/10.1098/rspb.1991.0125
Abstract
After a preliminary study of visual evoked potentials (VEPs) to a test grating seen in the presence of masks at different orientations, psychophysical data are presented showing the effects of adaptation and of masking on thresholds for detecting the same test grating. The test is a vertical grating of spatial frequency 2 cycles per degree; adapting and masking gratings differ from the test either in orientation or in spatial frequency. The effects of adaptation and masking are explained by a single mechanism model that assumes: (i) adaptation and masking both alter the contrast response (or transducer) function of the mechanism that detects the test; (ii) masks, but not adaptors, stimulate the mechanism that detects the test; and (iii) a test is detectable when it raises response level by a constant amount. The model incorporates two distinct tuning functions, a broad adaptive contrast function and a narrow effective contrast function. It accounts adequately for all the data, including the location and size of the facilitative dip found in some masking functions, the constant slopes of the threshold elevation segments of adaptation functions and the varying slopes of masking functions. It also predicts the sometimes surprising joint effects of adaptation followed by masking and of two masks operating simultaneously.Keywords
This publication has 16 references indexed in Scilit:
- The time course of adaptation to spatial contrastVision Research, 1991
- Receptive field properties of human motion detector units inferred from spatial frequency maskingVision Research, 1989
- The functional role of contrast adaptationVision Research, 1988
- Inhibitory interactions in the human vision system revealed in pattern‐evoked potentials.The Journal of Physiology, 1987
- Striate cortex of monkey and cat: contrast response function.Journal of Neurophysiology, 1982
- Contrast masking in human visionJournal of the Optical Society of America, 1980
- Grating contrast: Discrimination may be better than detectionVision Research, 1974
- The visual evoked potential as a function of contrast of a grating patternThe Journal of Physiology, 1972
- Electrophysiological evidence for the existence of orientation and size detectors in the human visual systemThe Journal of Physiology, 1970
- Orientational selectivity of the human visual systemThe Journal of Physiology, 1966