Connections of the Dorsomedial Visual Area: Pathways for Early Integration of Dorsal and Ventral Streams in Extrastriate Cortex

Rosa, Marcello G. P., Palmer, Susan M., Gamberini, Michela, Burman, Kathleen J., Yu, Hsin-Hao, Reser, David H., Bourne, James A., Tweedale, Rowan and Galletti, Claudio (2009) Connections of the Dorsomedial Visual Area: Pathways for Early Integration of Dorsal and Ventral Streams in Extrastriate Cortex. Journal of Neuroscience, 29 14: 4548-4563. doi:10.1523/JNEUROSCI.0529-09.2009

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Author Rosa, Marcello G. P.
Palmer, Susan M.
Gamberini, Michela
Burman, Kathleen J.
Yu, Hsin-Hao
Reser, David H.
Bourne, James A.
Tweedale, Rowan
Galletti, Claudio
Title Connections of the Dorsomedial Visual Area: Pathways for Early Integration of Dorsal and Ventral Streams in Extrastriate Cortex
Journal name Journal of Neuroscience   Check publisher's open access policy
ISSN 0270-6474
1529-2401
Publication date 2009-04-01
Year available 2009
Sub-type Article (original research)
DOI 10.1523/JNEUROSCI.0529-09.2009
Open Access Status File (Publisher version)
Volume 29
Issue 14
Start page 4548
End page 4563
Total pages 16
Editor John H R Maunsell
Place of publication United States
Publisher Society of Neuroscience
Language eng
Subject 920111 Nervous System and Disorders
110903 Central Nervous System
C1
Abstract The dorsomedial area (DM), a subdivision of extrastriate cortex characterized by heavy myelination and relative emphasis on peripheral vision, remains the least understood of the main targets of striate cortex (V1) projections in primates. Here we placed retrograde tracer injections encompassing the full extent of this area in marmoset monkeys, and performed quantitative analyses of the numerical strengths and laminar patterns of its afferent connections. We found that feedforward projections from V1 and from the second visual area (V2) account for over half of the inputs to DM, and that the vast majority of the remaining connections come from other topographically organized visual cortices. Extrastriate projections to DM originate in approximately equal proportions from adjacent medial occipitoparietal areas, from the superior temporal motion-sensitive complex centered on the middle temporal area (MT), and from ventral stream-associated areas. Feedback from the posterior parietal cortex and other association areas accounts for < 10% of the connections. These results do not support the hypothesis that DM is specifically associated with a medial subcircuit of the dorsal stream, important for visuomotor integration. Instead, they suggest an early-stage visual-processing node capable of contributing across cortical streams, much as V1 and V2 do. Thus, although DM may be important for providing visual inputs for guided body movements ( which often depend on information contained in peripheral vision), this area is also likely to participate in other functions that require integration across wide expanses of visual space, such as perception of self-motion and contour completion.
Keyword monkey
callithrix-jacchus
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Biomedical Sciences Publications
 
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Created: Tue, 01 Sep 2009, 18:59:21 EST by Cameron Harris on behalf of School of Biomedical Sciences