Organization of the ectostriatum based on afferent connections in the zebra finch (Taeniopygia guttata)

Laverghetta, Antonio; Shimizu, Toru

doi:10.1016/s0006-8993(02)03949-5

Cited by 36 publications

(53 citation statements)

References 24 publications

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“…Future studies using smaller localized lesions may reveal a finer, yet more extensive, functional organization of Ec. For example, the rostral tip of Ec receives input from the dorsoanterior subnucleus of nRT (Laverghetta and Shimizu, 2003), which contains color-sensitive cells (Wang et al, 1993). We predict that lesions localized to this area of Ec would impair on performance on color discrimination.…”

Section: Discussionmentioning

confidence: 92%

“…Wang et al (1993) found that neurons in the posterior nRT are motion sensitive, whereas neurons responsive to color and luminance are found in the anterior nRT. Husband and Shimizu (1999) showed that the caudal Ec receives input from the posterior nRT, and the rostral Ec receives input from the anterior nRT (Benowitz and Karten, 1976;Laverghetta and Shimizu, 2003).…”

Section: Discussionmentioning

confidence: 99%

“…Given that the nRT contains several distinct areas on the basis of neurochemistry, cytoarchitecture, tectal innervation, and physiology Benowitz and Karten, 1976;Revzin, 1979;Watanabe et al, 1985;Martinez-de-la-Torre et al, 1990;Wang et al, 1993;Mpodozis et al, 1996;Marin et al, 2003) and that the topographic nRT-Ec projection may be quite precise (Husband and Shimizu, 1999;Laverghetta and Shimizu, 2003), it is proba- Figure 4. Correlation between performance and the extent of the lesion in Ec.…”

Section: Discussionmentioning

confidence: 99%

“…At the top of this diagram, the extrastriate visual areas are related to specific functions: V4, MT, and inferotemporal (IT) cortex subserve higher-order color, motion, and form vision, respectively (Zeki, 1983a,b;Newsome et al, 1989;Tanaka et al, 1991). Shimizu and colleagues (Husband and Shimizu, 1999;Shimizu and Bowers, 1999;Laverghetta and Shimizu, 2003) outline that, like the mammalian thalamofugal pathway, there are streams in the avian tectofugal pathway (Fig. 5, middle).…”

Section: Visual Streams In the Mammalian And Avian Telencephalonmentioning

confidence: 99%

“…5, middle). The deep layers in the tectum project to caudal nRT, whereas the superficial layers project to rostral nRT (Benowitz and Karten, 1976;Marin et al, 2003); the caudal and rostral nRT project to the caudal and rostral Ec, respectively (Benowitz and Karten, 1976;Husband and Shimizu, 1999;Laverghetta and Shimizu, 2003). Ec projects differentially to areas of the telencephalon: the caudal and rostral Ec project to the neostriatum intermediale (NIL) and neostriatum frontale (NFL), respectively (Husband and Shimizu, 1999).…”

Section: Visual Streams In the Mammalian And Avian Telencephalonmentioning

confidence: 99%

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A Dissociation of Motion and Spatial-Pattern Vision in the Avian Telencephalon: Implications for the Evolution of “Visual Streams”

Nguyen¹,

Spetch²,

Crowder³

et al. 2004

J. Neurosci.

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The ectostriatum is a large visual structure in the avian telencephalon. Part of the tectofugal pathway, the ectostriatum receives a large ascending thalamic input from the nucleus rotundus, the homolog of the mammalian pulvinar complex. We investigated the effects of bilateral lesions of the ectostriatum in pigeons on visual motion and spatial-pattern perception tasks. To test motion perception, we measured performance on a task requiring detection of coherently moving random dots embedded in dynamic noise. To test spatialpattern perception, we measured performance on the detection of a square wave grating embedded in static noise. A double dissociation was revealed. Pigeons with lesions to the caudal ectostriatum showed a performance deficit on the motion task but not the grating task. In contrast, pigeons with lesions to the rostral ectostriatum showed a performance deficit on the grating task but not the motion task. Thus, in the avian telencephalon, there is a separation of visual motion and spatial-pattern perception as there is in the mammalian telencephalon. However, this separation of function is in the targets of the tectofugal pathway in pigeons rather than in the thalamofugal pathway as described in mammals. The implications of these findings with respect to the evolution of the visual system are discussed. Specifically, we suggest that the principle of parallel visual streams originated in the tectofugal pathway rather than the thalamofugal pathway.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Visual Streams In the Mammalian And Avian Telencephalonmentioning

confidence: 99%

Section: Visual Streams In the Mammalian And Avian Telencephalonmentioning

confidence: 99%

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A Dissociation of Motion and Spatial-Pattern Vision in the Avian Telencephalon: Implications for the Evolution of “Visual Streams”

Nguyen¹,

Spetch²,

Crowder³

et al. 2004

J. Neurosci.

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Internal structure of the nucleus rotundus revealed by mapping cadherin expression in the embryonic chicken visual system

Becker

Redies

2003

J of Comparative Neurology

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The nucleus rotundus is the largest nucleus of the avian thalamus. It is an important center of visual information processing and conveys information from the optic tectum to the ectostriatum in the telencephalon. The nucleus rotundus is generally believed to contain internal divisions processing information on color, form, motion, and looming of visual objects. The detailed arrangement of these internal divisions is unclear. Here, we map the expression of four classic cadherins (N-cadherin, R-cadherin, cadherin-6B, and cadherin-7), which are markers for specific functional gray matter divisions and their fiber connections in the vertebrate brain. Results show that each cadherin is expressed by one coherent part of the nucleus rotundus that is connected to other brain structures by fiber tracts expressing the same subtype of cadherin. Overall, the expression of the four cadherins encompasses almost the entire nucleus rotundus. The four cadherin-expressing parts show different degrees of overlap. For example, the cadherin-6B part and the cadherin-7 part overlap extensively, whereas the R-cadherin part and the cadherin-6B part show little overlap and are partially complementary. Regions with shallow gradients of cadherin expression alternate with regions that show relatively abrupt changes in cadherin expression. At some points, changes of cadherin expression are also arranged in a pinwheel-like fashion, alternating between clockwise and counterclockwise orientations. In general, these results are reminiscent of the organization of functional modules in the mammalian visual cortex. It is speculated that each domain of cadherin expression corresponds to a functional domain, which processes a specific stimulus feature.

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Definition and connections of the entopallium in the zebra finch (Taeniopygia guttata)

Krützfeldt

Wild

2003

J of Comparative Neurology

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In birds the entopallium (formerly known as the core region of ectostriatum) is the major thalamorecipient zone, within the telencephalon, of the tectofugal visual system. Here we sought to redefine the entopallium in the zebra finch, particularly with respect to a laterally adjacent zone, known as the perientopallium (formerly known as the periectostriatal belt), and to determine its projections. We show that the entopallium can be defined by the almost complete overlap of dense terminations of thalamic rotundal afferents and intense cytochrome oxidase activity and parvalbumin immunoreactivity. The perientopallium, on the other hand, can be defined by relatively sparse projections from nucleus rotundus, a calretinin-positive plexus of nerve fibers, and weak cytochrome oxidase activity and parvalbumin immunoreactivity. Within the entopallium, medial and lateral parts can be distinguished on the basis of cell packing density, differential patterns of parvalbumin immunoreactivity and cytochrome oxidase activity, and different projections. We show that the entopallium projects laterally and diffusely to the perientopallium and nidopallium (formerly the neostriatum) and specifically and densely to a teardrop-shaped nucleus in the ventrolateral mesopallium (formerly known as the hyperstriatum ventrale), here called MVL (abbreviation used as a proper name). This latter projection arises predominantly from medial parts of the entopallium, which also receives a reciprocal projection from MVL, and projects to the lateral striatum. These findings suggest that the entopallium can be divided into medial and lateral parts having different functions, one of which is to provide for an extratelencephalic outflow from the medial part, via the lateral striatum. The findings also challenge the idea that informational flow through the various stations of the telencephalic tectofugal visual system is largely sequential and, together with findings in the chicken (Alpar and Tömböl), suggest instead that further substantial projections to telencephalic visual areas in birds can arise independently from both E (entopallium) and Ep (perientopallial belt).

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Organization of the ectostriatum based on afferent connections in the zebra finch (Taeniopygia guttata)

Cited by 36 publications

References 24 publications

A Dissociation of Motion and Spatial-Pattern Vision in the Avian Telencephalon: Implications for the Evolution of “Visual Streams”

A Dissociation of Motion and Spatial-Pattern Vision in the Avian Telencephalon: Implications for the Evolution of “Visual Streams”

Internal structure of the nucleus rotundus revealed by mapping cadherin expression in the embryonic chicken visual system

Definition and connections of the entopallium in the zebra finch (Taeniopygia guttata)

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