Mapping hV4 and ventral occipital cortex: The venous eclipse

Winawer, Jonathan; Horiguchi, Hiroshi; Sayres, Rory; Amano, Kaoru; Wandell, Brian A.

doi:10.1167/10.5.1

Cited by 233 publications

(322 citation statements)

References 62 publications

(118 reference statements)

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“…When looking at visual field maps and their responsiveness across hemifields, a similar but complementary image emerges. For early visual areas (V1-4) response are strongly restricted to information in the contralateral visual field, extending no more than 3-4°into the ipsilateral field (Amano et al, 2009;Winawer et al, 2010). This corroborates our earlier statement about V1-3 and includes V4 as an unlikely candidate based on our between hemifield data.…”

Section: Discussionsupporting

confidence: 91%

“…As such it is very unlikely that adaptation in these areas underlie the duration after-effect reported here. For later visual areas such as V4, lateral occipital cortex (LO), and middle temporal visual areas (MT/MST), these estimates are much larger (6-14°) (Amano et al, 2009;Harvey & Dumoulin, 2011;Winawer et al, 2010). This relatively large size (FWHM: $14.1-32.9°) makes it more difficult to exclude these areas based on the distances measured here.…”

Section: Discussionmentioning

confidence: 78%

“…This anatomical property has functional consequences for the processing of information presented in different hemifields. For lower-visual areas (V1-4) responses are strongly restricted to stimulation in the contralateral visual field, extending no more than 3-4°into the ipsilateral field (Amano et al, 2009;Gattass, Gross, & Sandell, 1981;Gattass, Sousa, & Gross, 1988;Winawer, Horiguchi, Sayres, Amano, & Wandell, 2010). For other areas receptive fields show much larger responses to stimulation in the ipsilateral visual field (Amano et al, 2009).…”

Section: Methodsmentioning

confidence: 98%

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An investigation of the spatial selectivity of the duration after-effect

et al. 2017

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a b s t r a c tAdaptation to the duration of a visual stimulus causes the perceived duration of a subsequently presented stimulus with a slightly different duration to be skewed away from the adapted duration. This pattern of repulsion following adaptation is similar to that observed for other visual properties, such as orientation, and is considered evidence for the involvement of duration-selective mechanisms in duration encoding. Here, we investigated whether the encoding of duration -by duration-selective mechanisms -occurs early on in the visual processing hierarchy. To this end, we investigated the spatial specificity of the duration after-effect in two experiments. We measured the duration after-effect at adapter-test distances ranging between 0 and 15°of visual angle and for within-and between-hemifield presentations. We replicated the duration after-effect: the test stimulus was perceived to have a longer duration following adaptation to a shorter duration, and a shorter duration following adaptation to a longer duration. Importantly, this duration after-effect occurred at all measured distances, with no evidence for a decrease in the magnitude of the after-effect at larger distances or across hemifields. This shows that adaptation to duration does not result from adaptation occurring early on in the visual processing hierarchy. Instead, it seems likely that duration information is a high-level stimulus property that is encoded later on in the visual processing hierarchy.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 78%

Section: Methodsmentioning

confidence: 98%

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An investigation of the spatial selectivity of the duration after-effect

et al. 2017

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“…Here we used quantitative pRF analysis (34,(46)(47)(48) to study the properties of spared V1 cortex in five patients with chronic postchiasmatic lesions resulting in homonymous visual field quadrantanopia. We derived detailed retinotopic maps and visual field coverage maps of spared area V1 for each patient and made the following observations: (i) The spared V1 region of the lesioned hemisphere retained its coarse retinotopic organization, as described previously (35,45), the V1/V2 border remained stable, and retinotopic maps showed a monotonic progression of phase, as expected; and (ii) visual field coverage maps of the spared V1 area generally did not exactly match the area of the dense perimetric scotoma (Fig.…”

Section: Discussionmentioning

confidence: 99%

Population receptive field analysis of the primary visual cortex complements perimetry in patients with homonymous visual field defects

Papanikolaou

Keliris

Papageorgiou

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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Injury to the primary visual cortex (V1) typically leads to loss of conscious vision in the corresponding, homonymous region of the contralateral visual hemifield (scotoma). Several studies suggest that V1 is highly plastic after injury to the visual pathways, whereas others have called this conclusion into question. We used functional magnetic resonance imaging (fMRI) to measure area V1 population receptive field (pRF) properties in five patients with partial or complete quadrantic visual field loss as a result of partial V1+ or optic radiation lesions. Comparisons were made with healthy controls deprived of visual stimulation in one quadrant ["artificial scotoma" (AS)]. We observed no large-scale changes in spared-V1 topography as the V1/V2 border remained stable, and pRF eccentricity versus cortical-distance plots were similar to those of controls. Interestingly, three observations suggest limited reorganization: (i) the distribution of pRF centers in spared-V1 was shifted slightly toward the scotoma border in 2 of 5 patients compared with AS controls; (ii) pRF size in spared-V1 was slightly increased in patients near the scotoma border; and (iii) pRF size in the contralesional hemisphere was slightly increased compared with AS controls. Importantly, pRF measurements yield information about the functional properties of spared-V1 cortex not provided by standard perimetry mapping. In three patients, spared-V1 pRF maps overlapped significantly with dense regions of the perimetric scotoma, suggesting that pRF analysis may help identify visual field locations amenable to rehabilitation. Conversely, in the remaining two patients, spared-V1 pRF maps failed to cover sighted locations in the perimetric map, indicating the existence of V1-bypassing pathways able to mediate useful vision.cortical blindness | quadrantanopia | plasticity | retinotopy | hemianopia C ortical damage of the visual pathway often results from posterior or middle cerebral artery infarcts, hemorrhages, and other brain injuries. The most common visual cortex lesions involve the primary visual cortex (V1), the chief relayer of visual information to higher visual areas. Damage to area V1 or its primary inputs leads to the loss of conscious vision in the corresponding region of the contralateral visual hemifield, producing a dense contralateral scotoma that often covers a hemifield (hemianopia) or a single visual field quadrant (quadrantanopia).A much-debated issue is whether the adult V1 is able to reorganize after injury. Reorganization refers to long-term changes in the neuronal circuit (1) and generally requires the growth of new anatomic connections or a permanent change in the strength of existing connections. Several studies report significant remapping in area V1 of patients suffering from macular degeneration and other retinal lesions (2-12). The extent of this remapping has recently been called into question, however (1,(13)(14)(15)(16)(17)(18)(19). Less is known about how the visual system remaps to cover the visual field after injury to a...

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“…We assessed the degree to which the time series of any voxel in predefined regions of interest in the gray matter fitted a series of receptive field models as described by Dumoulin et al 30 . Best fitting models were retained if they accounted for more than 15% of the variance of the time series of each voxel as in previous research 50 . The retained models were then averaged across voxels to give an overall measure of the population receptive field properties for each region of interest.…”

Section: Methodsmentioning

confidence: 99%

Large-scale remapping of visual cortex is absent in adult humans with macular degeneration

et al. 2011

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International audienceThe occipital lobe contains a retinotopic representation of the visual field. The representation of the central retina in early visual areas (V1-3) is found at the occipital pole. When the central retina is lesioned in both eyes by macular degeneration, this region of visual cortex at the occipital pole is accordingly deprived of input. However, even when such lesions occur in adulthood, some visually driven activity in and around the occipital pole can be observed. It has been suggested that this activity is due to remapping of this area, so that it now responds to inputs from intact, peripheral retina. We evaluated whether or not remapping of visual cortex underlies this activity. Our fMRI results provide no evidence of remapping, questioning the contemporary view that early visual areas of the adult human brain have the capacity to reorganize extensively

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Mapping hV4 and ventral occipital cortex: The venous eclipse

Cited by 233 publications

References 62 publications

An investigation of the spatial selectivity of the duration after-effect

An investigation of the spatial selectivity of the duration after-effect

Population receptive field analysis of the primary visual cortex complements perimetry in patients with homonymous visual field defects

Large-scale remapping of visual cortex is absent in adult humans with macular degeneration

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