Hadjidimitrakis, K;
Bakola, S;
Chaplin, TA;
Yu, H-H;
Alanazi, O;
Chan, JM;
Worthy, KH;
(2019)
Topographic Organization of the 'Third-Tier' Dorsomedial Visual Cortex in the Macaque.
Journal of Neuroscience
, 39
(27)
pp. 5311-5325.
10.1523/JNEUROSCI.0085-19.2019.
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Abstract
The boundaries of the visual areas located anterior to V2 in the dorsomedial region of the macaque cortex remain contentious. This region is usually conceptualized as including two functional subdivisions: the dorsal component of area V3 (V3d) laterally and another area named the parietooccipital area (PO) or V6 medially. However, the nature of the putative border between V3d and PO/V6 has remained undefined. We recorded the receptive fields of multiunit clusters in male macaques and reconstructed the locations of recording sites using histological sections and computer-generated maps. Immediately adjacent to dorsomedial V2, we observed a representation of the lower contralateral quadrant that represented the vertical meridian at its rostral border. This region formed a simple eccentricity gradient from ∼<5° in the annectant gyrus to >60° in the parietooccipital medial sulcus. There was no topographic reversal where one would expect to find the border between V3d and PO/V6. Rather, near the midline, this lower quadrant map continued directly into a representation of the peripheral upper visual field without an intervening lower quadrant representation. Therefore, cortex previously assigned to the medial part of V3d and to PO/V6 forms a single map that includes parts of both quadrants. Together with previous observations that V3d and PO/V6 are densely myelinated relative to adjacent cortex and share similar input from V1, these results suggest that they are parts of a single area (for which we suggest the designation V6), which is distinct from the one forming the ventral component of the third-tier complex
| Type: | Article |
|---|---|
| Title: | Topographic Organization of the 'Third-Tier' Dorsomedial Visual Cortex in the Macaque |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1523/JNEUROSCI.0085-19.2019 |
| Publisher version: | https://doi.org/10.1523/JNEUROSCI.0085-19.2019 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | dorsal stream; parietooccipital sulcus; primate; receptive fields; visual cortex; visuotopic organization |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > The Sainsbury Wellcome Centre |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10077783 |
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