The mechanisms for detecting compressively sampled gratings

Vision Research
S J Rainville, F A Kingdom

Abstract

Contrast thresholds for sine-wave gratings are raised when the gratings are compressively sampled into a set of narrow bright bars on a dark background, even though this method of sampling preserves the mean luminance and contrast of the grating. Burr et al. [(1985). Vision Research, 25, 717-727] suggested threshold elevation was due to localized luminance adaptation to the sample bars, whose average peak luminance necessarily increased when fewer bars per cycle were present. Previously, we reported results using decrement-bar compressively sampled gratings (CSGs), which consist of dark sample bars on a bright background, which favoured the local luminance adaptation hypothesis (Kingdom & Rainville, 1995). Here we report experiments that suggest that this hypothesis is untenable. Using increment-bar CSGs (bright sample bars on a dark background) we found that raising background luminance while holding sample bar luminance constant reduced thresholds by as much as a factor of ten. This suggests that it is the contrast of the bars, rather than their luminance, which determines thresholds. Further experiments showed that CSG detection was facilitated by unsampled grating pedestals, and thresholds were elevated when the fundamental...Continue Reading

References

Jan 1, 1979·Vision Research·D R Williams, D I MacLeod
Jan 1, 1978·Vision Research·W S Geisler
Jul 1, 1992·Vision Research·N Graham, D C Hood
Feb 1, 1992·Vision Research·M M HayhoeR J Koshel
Feb 1, 1992·Vision Research·D I MacLeodW Makous
Oct 22, 1991·Proceedings. Biological Sciences·J Ross, H D Speed
Jan 1, 1991·Vision Research·J B Mulligan, D I MacLeod
Jan 1, 1990·Vision Research·C M CiceroneD I MacLeod
Jan 1, 1990·Vision Research·M M Hayhoe
Jan 1, 1987·Vision Research·M M HayhoeD C Hood
Feb 1, 1987·Journal of the Optical Society of America. A, Optics and Image Science·G E LeggeA E Burgess
Jan 1, 1986·Vision Research·P Whittle
Jan 1, 1986·Vision Research·A Bradley, I Ohzawa
Jan 1, 1985·Vision Research·A M Derrington, D R Badcock
Jan 1, 1985·Vision Research·D C BurrM C Morrone
Feb 1, 1971·The Journal of the Acoustical Society of America·H Levitt
Nov 1, 1966·The Journal of Physiology·F W Campbell, J J Kulikowski
Jan 1, 1984·Vision Research·M J Morgan, R J Watt
Jan 1, 1983·Vision Research·G E Legge, D Kersten
Oct 7, 1982·Nature·M J Morgan, R J Watt
Jan 1, 1981·Vision Research·M A Finkelstein, D C Hood
Jan 1, 1981·Vision Research·J M Foley, G E Legge
Jan 1, 1980·Biological cybernetics·H R Wilson
Dec 1, 1980·Journal of the Optical Society of America·G E Legge, J M Foley
Jun 1, 1994·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·J M Foley
Mar 1, 1994·Vision Research·R W Bowen, H R Wilson
Aug 1, 1996·Vision Research·M E McCourt, F A Kingdom
Apr 1, 1947·Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences·B H CRAWFORD

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