Sine-wave gratings:Scale invariance and spatial integration at suprathreshold contrast

Jamar, J.; Koenderink, Jan J.

doi:10.1016/0042-6989(83)90203-1

Cited by 27 publications

(14 citation statements)

References 13 publications

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“…While detection thresholds of luminance defined gratings depend on scale [7], other tasks such as detection of change in spatial frequency, amplitude or orientation [8,9] of suprathreshold gratings do not depend on spatial scale. Polat and Sagi [10] examined the dependency of lateral interactions on spatial scale in a contrast detection task for human observers.…”

Section: Introductionmentioning

confidence: 99%

Scale-invariance of receptive field properties in primary visual cortex

et al. 2007

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Background: Our visual system enables us to recognize visual objects across a wide range of spatial scales. The neural mechanisms underlying these abilities are still poorly understood. Size-or scale-independent representation of visual objects might be supported by processing in primary visual cortex (V1). Neurons in V1 are selective for spatial frequency and thus represent visual information in specific spatial wavebands. We tested whether different receptive field properties of neurons in V1 scale with preferred spatial wavelength. Specifically, we investigated the size of the area that enhances responses, i.e., the grating summation field, the size of the inhibitory surround, and the distance dependence of signal coupling, i.e., the linking field.

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Section: Introductionmentioning

confidence: 99%

Scale-invariance of receptive field properties in primary visual cortex

et al. 2007

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“…This holds true when the threshold contrast is changed either by presenting the stimulus at a different retinal illuminance level or by presenting it at a difTerent scale (different spatial frequency) (Jamar and Koenderink, 1983). A hypothesis that accounts for this behaviour is that it is a consequence of the very weak dependence of modulation thresholds on contrast at contrasts above about eight times threshold {Fig.…”

Section: Dlscljsslonmentioning

confidence: 95%

“…In two recent papers (Jamar et al 1982;Jamar and Koenderink, 1983) we reported on experiments in which we measured the detectability of modulations of the contrast and the spatial frequency of suprathreshold sine-wave ("carrier-") gratings. We found that the detectability depends on the spatial frequency of the modulation (our 1982 paper) and on the number of bars in the carrier grating but not on its spatial frequency (the 1983 paper).…”

Section: Introductionmentioning

confidence: 99%

“…This could be of importance for the scale-invariance results given in Jamar and Koenderink (1983 To check the influence of mean retinal illuminance we repeated some of our experiments at a number of illuminance levels, spanning a range of more than 3 decades. With gratings adjusted to contrasts equal to eight times the threshold contrast, we find that modulation thresholds are not affected by changes of the mean illuminance, although the threshold contrasts do of course depend on illuminance.…”

Section: Introductionmentioning

confidence: 99%

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Dependence of contrast detection and independence of AM and FM detection on retinal illuminance

Jamar

Koenderink

1984

Vision Research

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Abstract-Thresholdsfor the detection of contrast differences ("amplitude modulation", AM) and spatial frequency differences ('*frequency modulation". FIM) present in suprathreshold sine-wave gratings were measured as a function of mean retinal illuminance. These thresholds are found to be virtually independent of mean retinal illuminance, despite the fact that the threshold contrasts of the gratings do depend significantly on illuminance.

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“…Jamar & Koenderink (1983) found that the ability to detect contrast differences in a grating increased with increasing number of grating cycles. Similarly, Legge & Foley (1980 found that grating contrast thresholds decreased as the number of cycles in a grating was increased.…”

Section: Introductionmentioning

confidence: 99%

Flexibility of spatial averaging in visual perception

2005

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The classical receptive field (RF) concept-the idea that a visual neuron responds to fixed parts and properties of a stimulus-has been challenged by a series of recent physiological results. Here, we extend these findings to human vision, demonstrating that the extent of spatial averaging in contrast perception is also flexible, depending strongly on stimulus contrast and uniformity. At low contrast, spatial averaging is greatest (about 11 min of arc) within uniform regions such as edges, as expected if the relevant neurons have orientation-selective RFs. At high contrast, spatial averaging is minimal. These results can be understood if the visual system is balancing a trade-off between noise reduction, which favours large areas of averaging, and detail preservation, which favours minimal averaging. Two distinct populations of neurons with hard-wired RFs could account for our results, as could the more intriguing possibility of dynamic, contrast-dependent RFs.

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Sine-wave gratings:Scale invariance and spatial integration at suprathreshold contrast

Cited by 27 publications

References 13 publications

Scale-invariance of receptive field properties in primary visual cortex

Scale-invariance of receptive field properties in primary visual cortex

Dependence of contrast detection and independence of AM and FM detection on retinal illuminance

Flexibility of spatial averaging in visual perception

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