A retrograde fluorescent-labeling study of direct relationship between the limbic (anterodorsal and anteroventral thalamic nuclei) and the visual system in the albino rat

Ahmed, A.K.M. Farid; Guison, Noel G.; Yamadori, Takashi

doi:10.1016/s0006-8993(96)00283-1

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…These authors speculated that the retrosplenial cortex receives visual information relatively directly, either via V1 or the thalamus. Indeed, there are now reports of a direct retinal projection to the anterior thalamus, which in turn could project to the retrosplenial cortex (Conrad & Stumpf, 1975; Itaya & Van Hoesen, 1983; Farid Ahmed et al ., 1996; Major et al ., 2003). Studies in prosimian primates (Rosa et al ., 1997b) and other mammals (Kalia & Whitteridge, 1973; Montero et al ., 1973; Rosa, 1999) indicate that cells in the corresponding region have relatively small and well defined receptive fields, mostly located in the peripheral visual field; however, there is still little information about their response properties.…”

Section: Discussionmentioning

confidence: 99%

A distinct anatomical network of cortical areas for analysis of motion in far peripheral vision

Palmer

Rosa

2006

Eur J of Neuroscience

123

120

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We defined cortical areas involved in the analysis of motion in the far peripheral visual field, a poorly understood aspect of visual processing in primates. This was accomplished by small tracer injections within and around the representations of the monocular field of vision ('temporal crescents') in the middle temporal area (MT) of marmoset monkeys. Quantitative analyses demonstrate that the representation of the far periphery receives specific connections from the retrosplenial cortex (areas 23v and prostriata), as well as comparatively stronger inputs from the primary visual area (V1) and from areas surrounding MT (in particular, the medial superior temporal area, MST). In contrast, the far peripheral representation receives little or no input from most other extrastriate areas, including the second visual area (V2), the densely myelinated areas of the dorsomedial cortex, and ventral stream areas; these areas are shown to have robust projections to other parts of MT. Our results demonstrate that the responses of cells in different parts of a same visual area can be determined by different combinations of synaptic inputs, in terms of areas of origin. They also suggest that the interconnections responsible for motion processing in the far periphery of the visual field convey information that is crucial for rapid-response aspects of visual function such as orienting, postural and defensive reactions.

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Section: Discussionmentioning

confidence: 99%

A distinct anatomical network of cortical areas for analysis of motion in far peripheral vision

Palmer

Rosa

2006

Eur J of Neuroscience

123

120

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“…Most of these do not project or relay to the SC, and could not be involved in responses of the right SC to stimulation of the left eye. These include projections to the medial terminal nucleus (Dann & Buhl 1987), anterior thalamus (Farid Ahmed et al . 1996), hypothalamus (Moore et al .…”

Section: Methodsmentioning

confidence: 99%

Spontaneous regeneration of severed optic axons restores mapped visual responses to the adult rat superior colliculus

Foerster

Holmes

1999

Eur J of Neuroscience

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To test whether a spontaneous and functional regeneration of severed axons could occur within the adult mammalian central nervous system, a long-term recovery of microelectrode-mapped visual response was sought in the superior colliculus (SC) after its total or near-total abolition by a precise guillotine cut of the retinocollicular pathway. Recoveries were found 3 weeks or later in 15 of the 36 animals studied; in 10 of these recoveries, half or more of the width of the SC was involved. The recovered responses were often activated from within a normally small area of the visual field. Appropriate retinotopic maps were restored. Intraocular horseradish peroxidase tracing revealed a variety of novel optic trajectories, passing around lesions even of totally cut pathways, which eventually terminated in normally retinorecipient layers of those recovered SCs. Such detours could not be explained by a mechanical reorientation of brain structures. When exactly comparable lesions were examined within a few days, there were no detours: severed optic axons faced the cuts. In long-term animals where responsiveness remained absent, optic axonal reorientations were observed near lesions but the SC was not innervated. Extensive long-term recoveries were in marked contrast to the occasional rapid ones, found within a few days postlesion, which involved only an outermost silenced border of SC. These were attributed to a rapid reversal of conduction failure in spared, bordering, axons of this topographically organized pathway. The findings support the conclusion that, after they are cut, numbers of optic axons can regenerate to the SC and restore appropriate circuitry therein.

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Rapid Spatial Reorientation and Head Direction Cells

et al. 2003

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It is surprising how quickly we can find our bearings when suddenly confronted with a familiar environment, for instance when the lights are turned on in a dark room. Subjectively, this appears to occur almost instantaneously, yet the neural processes permitting this rapid reorientation are unknown. A likely candidate is the head direction (HD) cell system. These limbic neurons found in several brain regions, including the thalamus and the hippocampus, discharge selectively when the head of an animal is oriented in a particular ("preferred") direction. This neuronal activity is independent of position and ongoing behavior and is thus likely to constitute a physiological basis for the sense of direction. Remarkably, although the HD cell system has properties resembling those of a compass, it is independent of geomagnetic fields. Rather, the preferred directions of the HD cells are strongly anchored to visual cues in the environment. Here, we bring evidence for the first time that a fundamental component of the capacity to rapidly reorient in a familiar environment may be brought about by updating of HD cell responses as rapidly as 80 msec after changes in the visual scene. Continuous attractor networks have been used successfully to model HD cell ensemble dynamics. The present results suggest that after large rotations of the surrounding landmarks, activity in such networks may be propagated in abrupt jumps rather than in a gradually progressive manner.

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A retrograde fluorescent-labeling study of direct relationship between the limbic (anterodorsal and anteroventral thalamic nuclei) and the visual system in the albino rat

Cited by 4 publications

References 19 publications

A distinct anatomical network of cortical areas for analysis of motion in far peripheral vision

A distinct anatomical network of cortical areas for analysis of motion in far peripheral vision

Spontaneous regeneration of severed optic axons restores mapped visual responses to the adult rat superior colliculus

Rapid Spatial Reorientation and Head Direction Cells

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