Detection of orientationally multimodal textures.
Oriented textures were produced with the use of probability density functions modulated sinusoidally over orientation. Orientational contrast sensitivity functions (OCSFs) for a task involving the discrimination of these patterns from orientationally-random textures were found for several human observers. An inverse Fourier transform of this OCSF yielded a weighting function, or filter, defined over orientation. The weighting function is broad, with a half-height full-width of 34 deg. This orientational filter was able to predict human performance in further discrimination tasks employing a variety of probability density functions over orientation.
Keeble
D R
DR
Department of Pharmacology, University of Edinburgh, Scotland.
Kingdom
F A
FA
Moulden
B
B
Morgan
M J
MJ
D015350:Contrast Sensitivity; D004192:Discrimination, Psychological / Q000502:physiology; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D011601:Psychophysics; D012399:Rotation; D012684:Sensory Thresholds / Q000502:physiology