{"title":"Suprathreshold spatiotemporal response characteristics of the human visual system.","authors":"D O Bowker","doi":"10.1364/josa.73.000436","DOIUrl":null,"url":null,"abstract":"<p><p>The apparent contrasts of suprathreshold stationary gratings, countermodulated gratings, and homogeneous flickering fields were assessed with a contrast-matching procedure. Results show that, as stimulus amplitude is increased relative to threshold, variations in apparent contrast with spatiotemporal-frequency content become much less pronounced. In other words, the contrast-matching functions are more uniform across both spatial and temporal frequency at levels of contrast well above threshold. These data are interpreted in terms of a compensatory stage in the visual system that varies its gain characteristics according to the detectability of the stimulus.</p>","PeriodicalId":17413,"journal":{"name":"Journal of the Optical Society of America","volume":"73 4","pages":"436-40"},"PeriodicalIF":0.0000,"publicationDate":"1983-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1364/josa.73.000436","citationCount":"34","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Optical Society of America","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1364/josa.73.000436","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 34
Abstract
The apparent contrasts of suprathreshold stationary gratings, countermodulated gratings, and homogeneous flickering fields were assessed with a contrast-matching procedure. Results show that, as stimulus amplitude is increased relative to threshold, variations in apparent contrast with spatiotemporal-frequency content become much less pronounced. In other words, the contrast-matching functions are more uniform across both spatial and temporal frequency at levels of contrast well above threshold. These data are interpreted in terms of a compensatory stage in the visual system that varies its gain characteristics according to the detectability of the stimulus.
期刊介绍:
OSA was published by The Optical Society from January 1917 to December 1983 before dividing into JOSA A: Optics and Image Science and JOSA B: Optical Physics in 1984.