Norma van Surdam Graham
- Published in print:
- 1989
- Published Online:
- January 2008
- ISBN:
- 9780195051544
- eISBN:
- 9780199872183
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195051544.003.0001
- Subject:
- Psychology, Cognitive Neuroscience
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 ...
More
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.Less
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.
Norma van Surdam Graham
- Published in print:
- 1989
- Published Online:
- January 2008
- ISBN:
- 9780195051544
- eISBN:
- 9780199872183
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195051544.003.0003
- Subject:
- Psychology, Cognitive Neuroscience
This chapter describes near-threshold selective adaptation experiments, one of several experimental paradigms commonly used as evidence for or against the existence of multiple analyzers sensitive to ...
More
This chapter describes near-threshold selective adaptation experiments, one of several experimental paradigms commonly used as evidence for or against the existence of multiple analyzers sensitive to different values along some sensory or perceptual dimension. Possible explanations of selective-adaptation experimental results are presented including: simple fatigue (desensitization) models; a generalization of the Stiles desensitization model originally applied to color vision; and models either solely based on or including inhibition. The models are illustrated using experimental results on the spatial-frequency dimension.Less
This chapter describes near-threshold selective adaptation experiments, one of several experimental paradigms commonly used as evidence for or against the existence of multiple analyzers sensitive to different values along some sensory or perceptual dimension. Possible explanations of selective-adaptation experimental results are presented including: simple fatigue (desensitization) models; a generalization of the Stiles desensitization model originally applied to color vision; and models either solely based on or including inhibition. The models are illustrated using experimental results on the spatial-frequency dimension.
