The role of the primary visual cortex in higher level vision

Lee, Tai Sing; Mumford, David; Romero, R.; Lamme, Victor A. F.

doi:10.1016/s0042-6989(97)00464-1

Cited by 471 publications

(366 citation statements)

References 57 publications

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“…In contrast, the present data from anesthetized animals demonstrated clear modulation by nearby texture borders, but did not confirm the figural "interior enhancement" effects reported in the studies on alert animals (Lamme, 1995;Zipser et al, 1996;Lee et al, 1998). Only the recent alert monkey study of Lee et al (1998) distinguished between enhancement effects observed near texture boundaries and those related to the size and form of texture figures. In that study, texture border enhancement effects were most pronounced when the border was parallel to the cell's preferred orientation.…”

Section: Figure and Groundcontrasting

confidence: 99%

“…4 and 5 were based mainly on texture edges; only a few cells were tested exclusively with texture bars. However, a recent report suggested that texture responses can depend on the shape or size of the texture field and that figural and non-figure edges might produce different effects (Lee et al, 1998). We therefore compared the responses to texture edges and texture bars in 15 cells.…”

Section: Edges Vs Barsmentioning

confidence: 99%

“…But the study did not determine whether response differences were due to the size of the texture region or the distance of texture boundaries from the RF. Lee et al (1998) recently reported border effects that appeared most pronounced when the borders of the texture figure were parallel to the cell's preferred orientation.…”

Section: Introductionmentioning

confidence: 99%

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Response profiles to texture border patterns in area V1

2000

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Cells in area V1 of the anesthetized macaque monkey were stimulated with large texture patterns composed of homogeneous regions of line elements (texels) with different orientations. To human observers, such patterns appear to segregate, with the percept of sharp boundaries between texture regions. Our objective was to investigate whether the boundaries are reflected in the responses of single cells in V1. We measured responses to individual texels at different distances from the texture border. For each cell, patterns of optimally or orthogonally orientated texels were adjusted so that only one texel fell into the receptive field and all other texels fell in the visually unresponsive regions outside. In 37 out of 156 neurons tested (24%), texels immediately adjacent to a texture border evoked reliably larger responses than identical texels farther away from the border. In 17 neurons (11%), responses to texels near the border were relatively reduced. Border enhancement effects were generally stronger than border attenuation effects. When tested with four different border configurations (two global orientations and two edge polarities), many cells showed reliable effects for only one or two configurations, consistent with cells encoding information about the orientation of the texture border or its location with respect to the segmented region. Across the sample, enhancement effects were similar for all texture borders. Modulation by the texture surround was predominantly suppressive; even the responses near texture borders were smaller than those to a single line. We compared these results with the results of a popout test in which the line in the receptive field was surrounded by homogeneous texture fields either orthogonal or parallel to the center line. The patterns of response modulation and the temporal onset of differential responses were similar in the two tests, suggesting that the two perceptual phenomena are mediated by similar neural mechanisms.

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Section: Figure and Groundcontrasting

confidence: 99%

Section: Edges Vs Barsmentioning

confidence: 99%

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Response profiles to texture border patterns in area V1

2000

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“…Neurophysiologically, a role for MT/MST in Wgure/ground assignment for structure-from-motion has been suggested for the past two decades (Allman et al 1985;Olavarria et al 1992;Eifuku and Wurtz 1999;Born 2000;Born and Bradley 2005). Rapid feedback to V1 from areas with large receptive Welds, such as V2 or MT, was proposed in many cases Lamme 1995;Zipser et al 1996;Lee et al 1998;Nothdurft et al 1999Nothdurft et al , 2000Hupé et al 2001;Craft et al 2007). The connections between V1 and MT were found to conduct at the high speed of »10 m/s Wiesel 1983, 1989;Born and Tootell 1991;DeAngelis et al 1994;Grinvald et al 1994;Fitzpatrick 2000;Anderson et al 2001;Girard et al 2001;Bair et al 2002).…”

Section: Discussionmentioning

confidence: 99%

Occipital network for figure/ground organization

Likova

Tyler

2008

Exp Brain Res

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Abstract To study the cortical mechanism of Wgure/ ground categorization in the human brain, we employed fMRI and the temporal-asynchrony paradigm. This paradigm is able to eliminate any diVerential activation for local stimulus features, and thus to identify only global perceptual interactions. Strong segmentation of the image into diVerent spatial conWgurations was generated solely from temporal asynchronies between zones of homogeneous dynamic noise. The Wgure/ground conWguration was a single geometric Wgure enclosed in a larger surround region. In a control condition, the Wgure/ground organization was eliminated by segmenting the noise Weld into many identical temporal-asynchrony stripes. The manipulation of the type of perceptual organization triggered dramatic reorganization in the cortical activation pattern. The Wgure/ground conWguration generated suppression of the ground representation (limited to early retinotopic visual cortex, V1 and V2) and strong activation in the motion complex hMT+/ V5+; conversely, both responses were abolished when the Wgure/ground organization was eliminated. These results suggest that Wgure/ground processing is mediated by topdown suppression of the ground representation in the earliest visual areas V1/V2 through a signal arising in the motion complex. We propose a model of a recurrent cortical architecture incorporating suppressive feedback that operates in a topographic manner, forming a Wgure/ground categorization network distinct from that for "pure" scene segmentation and thus underlying the perceptual organization of dynamic scenes into cognitively relevant components. Permanent repository link

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“…Additionally, Kimia [17] provides a comprehensive discussion of the possible role of medial geometry in the human visual system. Neurophysiological experiments by Lee et al [19], [20] observed peak neural activity in the V1 cells at localities of medial axis and psychophysical experiments such as those by Kovacs [18] suggest that medial points may be used in encoding shape information.…”

Section: Introductionmentioning

confidence: 99%

Strategies for shape matching using skeletons

Goh¹

2008

Computer Vision and Image Understanding

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The role of the primary visual cortex in higher level vision

Cited by 471 publications

References 57 publications

Response profiles to texture border patterns in area V1

Response profiles to texture border patterns in area V1

Occipital network for figure/ground organization

Strategies for shape matching using skeletons

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