Identification and viuotopic organization of areas PO and POd in <i>Cebus</i> monkey

Neuenschwander, Sergio; Gattass, Ricardo; Sousa, Aglai P. B.; Piñon, Maria Carmen

doi:10.1002/cne.903400106

Cited by 42 publications

(81 citation statements)

References 34 publications

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“…Subsequent work on New World cebus monkeys (Neuenschwander et al, 1994) recognized PO (touching V2, upper fields medial), and POd (touching PO, upper fields medial). Rosa and Schmid (1995) mapped the dorsal cortex in the New World marmoset and presented a new scheme for area DM where all but central upper fields are represented as a continuous mirrorimage patch [like Allman and Kaas' (1975) original DM] mostly touching V2, whereas central upper fields of this DM are appended laterally (along a discontinuity) as a nonmirror-image patch.…”

Section: Brain Location Of Human V6mentioning

confidence: 99%

Wide-Field Retinotopy Defines Human Cortical Visual Area V6

et al. 2006

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The retinotopic organization of a newly identified visual area near the midline in the dorsalmost part of the human parieto-occipital sulcus was mapped using high-field functional magnetic resonance imaging, cortical surface-based analysis, and wide-field retinotopic stimulation. This area was found in all 34 subjects that were mapped. It represents the contralateral visual hemifield in both hemispheres of all subjects, with upper fields located anterior and medial to areas V2/V3, and lower fields medial and slightly anterior to areas V3/V3A. It contains a representation of the center of gaze distinct from V3A, a large representation of the visual periphery, and a mirror-image representation of the visual field. Based on similarity in position, visuotopic organization, and relationship with the neighboring extrastriate visual areas, we suggest it might be the human homolog of macaque area V6, and perhaps of area M (medial) or DM (dorsomedial) of New World primates.

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Section: Brain Location Of Human V6mentioning

confidence: 99%

Wide-Field Retinotopy Defines Human Cortical Visual Area V6

et al. 2006

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“…This description is straightforward but is unsupported by citation or the literature as a whole. For example, neighboring capuchin areas PO and POd are not separated by a reversal, but each area covers the visual hemifield (Neuenschwander et al, 1994). Similarly, neighboring macaque regions V4-proper and V4A (DLc/DLr) share the same field sign but have redundant visual field coverage (Van Essen and Zeki, 1978), and the question of whether they are parts of a single area is debated (Stepniewska et al, 2005).…”

Section: Previous Schemes That Conflict Conceptually With Our V4mentioning

confidence: 99%

Topographic Organization in and near Human Visual Area V4

Hansen¹,

Kay²,

Gallant³

2007

J. Neurosci.

151

160

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The existence and location of a human counterpart of macaque visual area V4 are disputed. To resolve this issue, we used functional magnetic resonance imaging to obtain topographic maps from human subjects, using visual stimuli and tasks designed to maximize accuracy of topographic maps of the fovea and parafovea and to measure the effects of attention on topographic maps. We identified multiple topographic transitions, each clearly visible in Ն75% of the maps, that we interpret as boundaries of distinct cortical regions. We call two of these regions dorsal V4 and ventral V4 (together comprising human area V4) because they share several defining characteristics with the macaque regions V4d and V4v (which together comprise macaque area V4). Ventral V4 is adjacent to V3v, and dorsal V4 is adjacent to parafoveal V3d. Ventral V4 and dorsal V4 meet in the foveal confluence shared by V1, V2, and V3. Ventral V4 and dorsal V4 represent complementary regions of the visual field, because ventral V4 represents the upper field and a subregion of the lower field, whereas dorsal V4 represents lower-field locations that are not represented by ventral V4. Finally, attentional modulation of spatial tuning is similar across dorsal and ventral V4, but attention has a smaller effect in V3d and V3v and a larger effect in a neighboring lateral occipital region.

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“…Areas in the IPS were similarly identified by reference to published mapping studies and by analysis of selected sections counterstained for architectonic characteristics (Colby et al, 1988;Andersen et al, 1990;Blatt et al, 1990;Neuenschwander et al, 1994). Area 5 (MIP of Colby et al, 1988) can be identified on the basis of large pyramidal cells in layer 5.…”

Section: Discussionmentioning

confidence: 99%

Collateralized divergent feedback connections that target multiple cortical areas

Rockland

Drash

1996

J. Comp. Neurol.

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Nonreciprocal feedback connections from ventromedial areas TE and TF have previously been reported to visual areas V1 and V2 (Kennedy and Bullier, 1985; Rockland and Van Hoesen, 1994). The present report confirms these earlier observations by utilizing anterograde label in conjunction with serial section analysis. Furthermore, it directly demonstrates the divergent configuration and range of these terminal fields. Thirteen axons were analyzed from ventromedial TE (4) or area TF (9) to occipitotemporal areas, and two from area TF to the upper bank of the intraparietal sulcus (IPS). All these axons have narrow, elongated fields that range from 4.0-21.0 mm. Terminations are distributed linearly along the axon or, in some cases, concentrated in irregularly spaced clusters. Most of these axons have terminations concentrated in layer 1. The two axons in the IPS have a bistratified terminal distribution (in layers 1-3 and 6) in their anterior field, but a distinctly different laminar pattern (with terminations concentrated in layer 1) in their distal 2.0 mm. These fields probably correspond to different areas, most likely MIP and PO. Axons projecting from higher order to early visual areas may contribute to extraperceptual, complex processes within area V1, such as activation in response to visual imagery, and are a possible substrate for synchronous linkage of spatially discrete assemblies of neurons. In summary, these results demonstrate 1) that some neurons in ventromedial TE and TF are in direct communication with early visual areas, including V1 and V2, and 2) that some feedback axons target several areas, sometimes with different laminar termination patterns. These results emphasize that cortical areas are interrelated by multiple direct and indirect pathways, not all of which are strictly hierarchical.

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Identification and viuotopic organization of areas PO and POd in Cebus monkey

Cited by 42 publications

References 34 publications

Wide-Field Retinotopy Defines Human Cortical Visual Area V6

Wide-Field Retinotopy Defines Human Cortical Visual Area V6

Topographic Organization in and near Human Visual Area V4

Collateralized divergent feedback connections that target multiple cortical areas

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