Colored aftereffects contingent on patterns generated by Lie transformation groups

Emerson, Victor F.; Humphrey, G. Keith; Dodwell, P. C.

doi:10.3758/bf03202851

Cited by 25 publications

(37 citation statements)

References 35 publications

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“…Not only is the time course for fatiguing of such detectors far too short to be a useful model for these effects, it is also necessary that the patterns that generate PCCAEs have some global structure. It is therefore plausible to postulate that the neural mechanisms involved are at a higher level than is commonly supposed, and we suggest again that the vectorfields of LTG/NP have the requisite properties to account for the phenomena described in this paper (see Dodwell, 1984;Emerson et al, 1985).…”

Section: Discussionmentioning

confidence: 53%

Pattern-contingent color aftereffects on noninduced patterns

Humphrey

Dodwell

Emerson

1989

Perception & Psychophysics

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Section: Discussionmentioning

confidence: 53%

Pattern-contingent color aftereffects on noninduced patterns

Humphrey

Dodwell

Emerson

1989

Perception & Psychophysics

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“…Curvaturedependent colored aftereffects were also discussed for their implication with respect to the existence of "curvature detectors" by Riggs (1973; see also White & Riggs, 1974) and by MacKay and MacKay (1974). Emerson, Humphrey, and Dodwell (1985) also obtained colored aftereffects contingent on circular and other complex patterns, and argued that these and some other McColloughtype effects are due to visual operations that include the registration of the vector field properties of these patterns.…”

Section: Resultsmentioning

confidence: 99%

Display organization and the detection of horizontal line segments

Moraglia

1989

Perception & Psychophysics

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Observers searched for a horizontal line segment through displays containing varying numbers of elements differing from the target and from each other in terms of orientation. These elements were always positioned on imaginary concentric circles centered in the middle of the display. They were allocated to these positions either randomly or in such a way that their orientation was equal to that of the tangent to the circle at that position. The search for the target line appeared to proceed spatially in parallel with the latter class of displays, and serially with the former. These findings are explained and discussed within the context of the attentive-preattentive dichotomy that characterizes spatial vision.

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“…This theory rejects an explanation of the McCollough effect based on edge detectors because of the long duration of the McCollough effect. Emerson et al (1988) also reject the spatialfrequency account of the McCollough effect with checkerboards (Green et al, 1976;May & Matteson, 1976) on the basis of the arguments put forward by Smith (1977) and Tyler (1977) cited above. The results of our experiments with higher harmonics, and particularly the effects obtained on the nonadapted checkerboard, question these arguments and suggest that some form of global spectral mechanism, basedon the two-dimensional Fourier analysis of the visual input, takes place.…”

Section: Discussionmentioning

confidence: 96%

“…A global theory of vision has been put forward and tested with the McCollough effect by Emerson, Humphrey, and Dodwell (1988). The basis of this theory is that there are certain "primitive" patterns that underlie most forms of pattern vision and are basic to all visual processing.…”

Section: Discussionmentioning

confidence: 99%

Spatial-frequency-contingent color aftereffects: Adaptation with two-dimensional stimulus patterns

Webster

Day

Gillies

et al. 1992

Perception & Psychophysics

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The spatial-frequency theory of vision has been supported by adaptation studies using checkerboards in which contingent color aftereffects (CAEs) were produced at fundamental frequencies oriented at 45 0 to the edges. A replication of this study failed to produce CAEs at the orientation of either the edges or the fundamentals. Using a computer-generated display, no CAEs were produced by adaptation of a square or an oblique checkerboard. But when one type of checkerboard (4 cpd) was adapted alone, CAEs were produced on the adapted checkerboard and on sine-wave gratings aligned with the fundamental and third harmonics of the checkerboard spectrum. Adaptation of a coarser checkerboard (0.80 cpd) produced CAEs aligned with both the edges and the harmonic frequencies. With checkerboards of both frequencies, CAEs were also found on the other type of checkerboard that had not been adapted. This observation raises problems for any edgedetector theory of vision, because there was no adaptation to edges. It was concluded that spatialfrequency mechanisms are operating at both low-and high-spatial frequencies and that an edge mechanism is operative at lower frequencies. The implications of these results are assessed for other theories of spatial vision.

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Colored aftereffects contingent on patterns generated by Lie transformation groups

Cited by 25 publications

References 35 publications

Pattern-contingent color aftereffects on noninduced patterns

Pattern-contingent color aftereffects on noninduced patterns

Display organization and the detection of horizontal line segments

Spatial-frequency-contingent color aftereffects: Adaptation with two-dimensional stimulus patterns

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