2005
DOI: 10.1152/jn.01330.2004
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Cortical Representation of Space Around the Blind Spot

Abstract: . The neural mechanism that mediates perceptual filling-in of the blind spot is still under discussion. One hypothesis proposes that the cortical representation of the blind spot is activated only under conditions that elicit perceptual filling-in and requires congruent stimulation on both sides of the blind spot. Alternatively, the passive remapping hypothesis proposes that inputs from regions surrounding the blind spot infiltrate the representation of the blind spot in cortex. This theory predicts that indep… Show more

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Cited by 50 publications
(39 citation statements)
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“…We attribute the impaired curvature discrimination performance observed here to the absence of a cortical representation of the illusory contour in the blind spot region rather than to a failure in the curvature readout process. This absence of a cortical representation of the contralateral portion of the visual field corresponding to the blind spot has been reported specifically for V1 (Awater et al, 2005;Tong & Engel, 2001;Horton et al, 1990;Ts'o et al, 1990;Tootell & Hamilton, 1989;Tootell et al, 1988). We therefore conclude that V1 neurons play a critical role in generating the illusory contour representation which served as the basis of curvature discrimination in the current task.…”
Section: Discussionsupporting
confidence: 68%
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“…We attribute the impaired curvature discrimination performance observed here to the absence of a cortical representation of the illusory contour in the blind spot region rather than to a failure in the curvature readout process. This absence of a cortical representation of the contralateral portion of the visual field corresponding to the blind spot has been reported specifically for V1 (Awater et al, 2005;Tong & Engel, 2001;Horton et al, 1990;Ts'o et al, 1990;Tootell & Hamilton, 1989;Tootell et al, 1988). We therefore conclude that V1 neurons play a critical role in generating the illusory contour representation which served as the basis of curvature discrimination in the current task.…”
Section: Discussionsupporting
confidence: 68%
“…In histological preparations of macaque (Tootell, Switkes, Silverman, & Hamilton, 1988) and human V1 (Horton, Dagi, McCrane, & DeMonasterio, 1990), the blind spot can be identified in the input layer IV as an elliptical monocular region, about four ocular dominance columns wide. Functionally, V1 neurons within the retinotopic representation of the blind spot (referred to as ''blind spot representation'' from now on) are driven entirely by the ipsilateral eye (Awater, Kerlin, Evans, & Tong, 2005;Tong & Engel, 2001). Results from a functional magnetic resonance imaging study in humans suggest that the cortical blind spot representation is confined to visual area V1 (Awater et al, 2005;Tootell et al, 1998) and lost later on.…”
Section: Introductionmentioning
confidence: 99%
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“…The blind spots, although they are omnipresent, naturally occurring scotomas, are located in the midperiphery, where there is less cortex devoted to visual analysis, and the RFs are larger relative to the fovea (4, 5, 10). Not surprisingly, fMRI studies of the blind spot can only localize a small area of V1 corresponding to the blind spot, which does not make it ideally suited for these questions of ectopic responses and plasticity (36,37). Artificial, reversible scotomas caused by stabilization of the stimulus on the retina are transient and most effective in the periphery (38), making them difficult to measure in early visual areas with fMRI because of the comparatively slow temporal resolution of fMRI and the relatively smaller amount of cortex devoted to peripheral processing (10,11,39,40).…”
Section: Comparisons With Studies On the Cortical Effects Of Other Rementioning
confidence: 99%
“…Retinotopic visual areas of each subject were delineated in a separate experimental session using well-established methods (DeYoe et al 1996;Engel et al 1997;Sereno et al 1995). Details of our specific procedures for retinotopic mapping and cortical flattening can be found in previous reports from our laboratory (Awater et al 2005). In brief, subjects maintained fixation while viewing "traveling wave" stimuli consisting of rotating wedges and expanding rings, which were used to construct phaseencoded retinotopic maps of polar angle and eccentricity, respectively.…”
Section: Regions Of Interestmentioning
confidence: 99%