Receptive fields of neurons at the confluence of cerebral cortical areas 17, 18, 20 a, and 20 b in the cat

Payne, Bertram R.; Siwek, Donald F.

doi:10.1017/s0952523800005216

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…F: The transition zone and the substantial decrease in the density of myelin at the medial bor- common transition zone separating areas 17, 18, 20a, and 20b (* in Fig. 1 A), and the unusual receptive fields of the neurons studied are described in a subsequent paper (Payne & Siwek, 1990).…”

Section: Overviewmentioning

confidence: 82%

Representation of the ipsilateral visual field in the transition zone between areas 17 and 18 of the cat's cerebral cortex

1990

Vis Neurosci

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The representation of the visual field in the architectonically defined transition zone between areas 17 and 18 of cat cerebral cortex was assessed by recording the activities and plotting the receptive fields of neurons at 2327 sites along 148 electrode penetrations made in 19 cats. The results show that the transition zone contains a significant representation of the ipsilateral visual hemifield although not all elevations in the visual field are represented to the same extent. The shape of the field region represented resembles an hour glass, for the region represented is narrowest on the 0-deg horizontal meridian and increasingly wider at progressively more positive and negative elevations. When receptive-field centers are considered, the extent of the representation reaches to -2.5 deg on the 0-deg horizontal meridian and to 10 or more degrees towards the field periphery. When receptive-field areas are considered, the representation at the 0-deg horizontal meridian extends to -3.6 deg and to beyond 20 deg at other elevations. In contrast, the visual-field representations in flanking areas 17 and 18 are essentially limited to the contralateral hemifield. The presence of a distinct representation of part of the ipsilateral hemifield in the transition zone suggests that the zone may have connections distinctly different from those of the adjacent areas. The observations bear on the problems of understanding the visual pathways in hypopigmented cats and binocular disparity mechanisms about the midline.

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Section: Overviewmentioning

confidence: 82%

Representation of the ipsilateral visual field in the transition zone between areas 17 and 18 of the cat's cerebral cortex

1990

Vis Neurosci

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“…The extremely large receptive fields were plotted for neurons at the first seven sites along track T7. These neurons as well as those studied at the first 12 sites of track T8, which have not been plotted here because of their extremely large size, were recorded in the common transition zone (asterisk) between areas 17, 18, 20a, and 20b and they have been more fully described elsewhere (Payne & Siwek, 1990). Fig.…”

Section: Discussionmentioning

confidence: 99%

“…9). This transi-tional cortex contains many transcallosally projecting neurons and it is a common zone not only between areas 17 and 18, but also between areas 20a and 20b (Payne & Siwek, 1990).…”

Section: The Upper Field Representationmentioning

confidence: 99%

Visual-field map in the transcallosal sending zone of area 17 in the cat

Payne

1991

Vis Neurosci

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The representation of the visual field in the part of area 17 containing neurons that project axons across the corpus callosum to the contralateral hemisphere was defined in the cat. Of 1424 sites sampled along 77 electrode tracks, 768 proved to be in the callosal sending zone, which was identified by retrograde transport of horseradish peroxidase that had been deposited in the opposite hemisphere. The results show that the callosal sending zone has a fairly constant width of between 3 and 4 mm at most levels in area 17. However, the representation of the contralateral field at the different elevations of the visual field is not equal in this zone. The zone represents positions within 4 deg of the midline at the 0-deg horizontal meridian, and positions out to 15-deg azimuths in the upper hemifield and out to positions of 25-deg azimuth in the lower hemifield. The shape of the representation is approximately mirror-symmetric about the horizontal meridian, although there is a greater extent in the lower hemifield, which can be accounted for by the greater range of elevations (>60 deg) represented there compared with the upper hemifield (-40 deg). The representation in the sending zone of one hemisphere matches that present in the area 17/18 transition zone, which receives the bulk of transcallosal projections, in the opposite hemisphere. The observations on the sending zone show that callosal connections of area 17 are concerned with a vertical hour-glass-shaped region of the visual field centered on the midline. The observations suggest that in addition to interactions between neurons concerned with positions immediately adjacent to the midline, there are positions, especially high and low in the visual field, where interactions can occur between neurons that have receptive fields displaced some distance from the midline.

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“…Receptive fields are known to be much larger at the confluence of visual cortical areas (e.g. Payne & Siwek, 1990) and LPl axon terminations are most expansive at borders between visual cortical areas (e.g. Birnbacher & Albus, 1987;Miceli et al, 1991; see also Bullier et al, 1984).…”

Section: Discussionmentioning

confidence: 99%

Lateral division of the lateral posterior region: Connections with area 18 in cats

et al. 1996

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To establish the topography of the lateral division of the lateral posterior region (LP1) projections to area 18, up to five different anatomical tracers were injected in separate rostrocaudal locations in area 18 of four adult cats, and patterns of retrogradely labeled LP1 cells were identified. LP1 inputs to area 18 arose from both caudal and rostral nuclei and were topological, organized in patterns that indicate that lower visual space is represented anteroventrally, and more central and upper visual space is represented caudodorsally. In the caudal LP1 nucleus, patches of labeled cells formed bands that ran parallel to the medial and lateral LPI borders and encompassed medial portions of the nucleus. In rostral LP1, the patches of labeled cells formed clusters giving the connections with area 18 a more modular appearance, and were nearer the lateral LP1 border. Injections made nearest area centralis representations in area 18 labeled more neurons than injections in cortex representing more peripheral visual space. Also, neighboring injections in area 18 labeled overlapping patches of cells, but no double-labeled cells were observed. These findings are consistent with previous conclusions based on electrophysiological mapping studies, that two retinotopically organized nuclei constitute LP1.

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Receptive fields of neurons at the confluence of cerebral cortical areas 17, 18, 20 a, and 20 b in the cat

Cited by 8 publications

References 22 publications

Representation of the ipsilateral visual field in the transition zone between areas 17 and 18 of the cat's cerebral cortex

Representation of the ipsilateral visual field in the transition zone between areas 17 and 18 of the cat's cerebral cortex

Visual-field map in the transcallosal sending zone of area 17 in the cat

Lateral division of the lateral posterior region: Connections with area 18 in cats

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