Cortical afferents of visual area MT in the <i>Cebus</i> monkey: Possible homologies between New and old World monkeys

Rosa, Marcello G. P.; Soares, José Agnelo; Fiorani, Mário; Gattass, Ricardo

doi:10.1017/s0952523800006064

Cited by 109 publications

(127 citation statements)

References 85 publications

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“…As in other species of monkey (Desimone and Rosa et al, 1993), the superior temporal cortex of the marmoset contains a complex of motionsensitive areas (Rosa and Elston, 1998). The present study confirmed area MT as one of the most important sources of cortical projections to DM [Spatz and Tigges (1972), their focus #7], containing 7.2% of all labeled extrinsic neurons (range: 5.0 -12.0%) (Fig.…”

Section: Projections From V1 and V2supporting

confidence: 87%

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

Palmer²,

et al. 2009

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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 Ͻ10% 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.

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Section: Projections From V1 and V2supporting

confidence: 87%

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

Palmer²,

et al. 2009

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“…MST shares with V6Av a strong sensitivity to the direction of motion of objects in the visual field (Desimone and Ungerleider, 1986;Saito et al, 1986;Galletti et al, 1996) and has been shown to send a reciprocal projection to the region likely to encompass V6Av in the New World monkey Cebus apella (Rosa et al, 1993). In addition, MST receives specific projections from the regions of V1 and V2 subserving peripheral vision (Sousa et al, 1991;Palmer and Rosa, 2006).…”

Section: Connections With Visual Areasmentioning

confidence: 99%

Cortical Connections of Area V6Av in the Macaque: A Visual-Input Node to the Eye/Hand Coordination System

Passarelli¹,

Rosa²,

Gamberini³

et al. 2011

J. Neurosci.

100

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The goal of the present study was to elucidate the corticocortical afferent connections of area V6Av, the ventral subregion of area V6A, using retrograde neuronal tracers combined with physiological and cytoarchitectonic analyses in the macaque monkey. The results revealed that V6Av receives many of its afferents from extrastriate area V6, and from regions of areas V2, V3, and V4 subserving peripheral vision. Additional extrastriate visual projections originate in dorsal stream areas MT and MST. Area V6Av does not receive projections directly from V1; such connections were only observed when the injection sites crossed into area V6. The strongest parietal lobe afferents originate in fields V6Ad, PGm, MIP (medial intraparaietal), and PG, with frontal lobe afferents originating from the frontal eye field, caudal area 46, and the rostral subdivision of the dorsal premotor area (F7). A comparison of their respective connections supports the view that V6Av is functionally distinct from adjacent areas (V6 and V6Ad). The strong afferents from V6 and other extrastriate areas are consistent with physiological data that suggest that V6Av is primarily a visual area, supporting the notion that V6Av is part of a dorsomedial cortical network performing fast form and motion analyses needed for the visual guidance of action.

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“…The New World (Platyrrhine) monkey Cebus apella has been the subject of a number of recent studies aimed at elucidating visual system organization and function (Gattass et al, 1987;Rosa et al, 1988Rosa et al, , 1993Fiorani et al, 1989;Sousa et al, 1991). Despite a distant point of evolutionary divergence, these studies have revealed some extraordinary parallels between the Cebus monkey and the Old World (Catarrhine) macaque, which is the most widely studied nonhuman primate model for vision.…”

Section: Functional Modularity: Relationship Between Directionality Amentioning

confidence: 99%

Electrophysiological Imaging of Functional Architecture in the Cortical Middle Temporal Visual Area ofCebus apellaMonkey

et al. 2003

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We studied the spatial organization of directionally selective neurons in the cortical middle temporal visual area (area MT) of the Cebus monkey. We recorded neuronal activity from multielectrode arrays as they were stepped through area MT. The set of recording sites in each array penetration described a plane parallel to the cortical layers. At each recording site, we determined the preferred direction of motion. Responses recorded at successive locations from the same electrode in the array revealed gradual changes in preferred direction, along with occasional directional reversals. Comparisons of responses from adjacent electrodes at successive locations enabled electrophysiological imaging of the two-dimensional pattern of preferred directions across the cortex. Our results demonstrate a systematic organization for directionality in area MT of the New World Cebus monkey, which is similar to that known to exist in the Old World macaque. In addition, our results provide electrophysiological confirmation of map features that have been documented in other cortical areas and primate species by optical imaging. Specifically, the tangential organization of directional selectivity is characterized by slow continuous changes in directional preference, as well as lines (fractures) and points (singularities) that fragment continuous regions into patches. These electrophysiological methods also allowed a direct investigation of neuronal selectivities that give rise to map features. In particular, our results suggest that inhibitory mechanisms may be involved in the generation of fractures and singularities.

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Cortical afferents of visual area MT in the Cebus monkey: Possible homologies between New and old World monkeys

Cited by 109 publications

References 85 publications

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

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

Cortical Connections of Area V6Av in the Macaque: A Visual-Input Node to the Eye/Hand Coordination System

Electrophysiological Imaging of Functional Architecture in the Cortical Middle Temporal Visual Area ofCebus apellaMonkey

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