Chapter

Neurophysiology and Psychophysics

Norma van Surdam Graham

in Visual Pattern Analyzers

Published in print December 1989 | ISBN: 9780195051544
Published online January 2008 | e-ISBN: 9780199872183 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780195051544.003.0001

Series: Oxford Psychology Series

 Neurophysiology and Psychophysics

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This chapter provides the necessary background for the study of visual pattern analyzers (e.g., spatial frequency and orientation-selective channels, direction-selective mechanisms). It briefly describes known properties of neurons in cortical areas V1 and V2, which may be the physiological substrate for the visual pattern analyzers. It introduces seventeen spatiotemporal dimensions of pattern vision along which neurons, and visual patterns and analyzers can differ. Several psychophysical paradigms are introduced that use near-threshold visual patterns. The chapter describes the models appropriate for interpreting results from these near-threshold paradigms and speculates about why these results have been particularly useful in uncovering the multiple-analyzer stage of visual processing.

Keywords: cortical areas V1 and V2; spatial frequency; orientation; channels; direction-selective mechanisms; eye of origin; psychophysical; contrast threshold

Chapter.  14357 words.  Illustrated.

Subjects: Neuropsychology

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