The representations of the visual field on the posterior cortex of Octodon degus

Olavarría, Jaime F.; Méndez, Bernardita

doi:10.1016/0006-8993(79)90684-x

Cited by 29 publications

(17 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mouse extrastriate cortex also differs from that in many nonprimate species (i.e., quoll, hedgehog, guinea pig, rabbit, flying fox, opossum, squirrel, tree shrew, cat) in which V1 is adjoined on the lateral side by a single area, V2 (Kaas et al, 1970(Kaas et al, , 1989Hall et al, 1971;Towns et al, 1977;Payne, 1993;Rosa, 1999;Kahn et al, 2000), and therefore has a "simple" organization . However, mouse extrastriate cortex is similar to that in species with a "simple" organization, in that V1 is adjoined on the medial side by parastriate or splenial visual areas, which in hedgehog, rat, hamster, degu, guinea pig, and cat receive direct V1 input and contain visually responsive neurons (Kalia and Whitteridge, 1973;Choudhury, 1978;Gould and Ebner, 1978;Olavarria and Mendez, 1979;Bravo et al, 1990;Olavarria and Montero, 1990;Spatz et al, 1991;Montero, 1993). Thus, mouse extrastriate cortex is "simple" in the sense that it has a single V2-like area, LM, on the lateral side of V1, but is "complex" in that lateral V1 is adjoined by multiple visual areas.…”

Section: Vertical Meridian Representation In V1 Is Confined To V1/lm mentioning

confidence: 91%

Area map of mouse visual cortex

Wang

Burkhalter

2007

J of Comparative Neurology

450

670

View full text Add to dashboard Cite

It is controversial whether mouse extrastriate cortex has a "simple" organization in which lateral primary visual cortex (V1) is adjoined by a single area V2 or has a "complex" organization, in which lateral V1 is adjoined by multiple distinct areas, all of which share the vertical meridian with V1. Resolving this issue is important for understanding the evolution and development of cortical arealization. We have used triple pathway tracing combined with receptive field recordings to map azimuth and elevation in the same brain and have referenced these maps against callosal landmarks. We found that V1 projects to 15 cortical fields. At least nine of these contain maps with complete and orderly representations of the entire visual hemifield and therefore represent distinct areas. One of these, PM, adjoins V1 at the medial border. Five areas, P, LM, AL, RL, and A, adjoin V1 on the lateral border, but only LM shares the vertical meridian representation with V1. This suggests that LM is homologous to V2 and that the lateral extrastriate areas do not represent modules within a single area V2. Thus, mouse visual cortex is "simple" in the sense that lateral V1 is adjoined by a single V2-like area, LM, and "complex" in having a string of areas in lateral extrastriate cortex, which receive direct V1 input. The results suggest that large numbers of areas with topologically equivalent maps of the visual field emerge early in evolution and that homologous areas are inherited in different mammalian lineages.

show abstract

Section: Vertical Meridian Representation In V1 Is Confined To V1/lm mentioning

confidence: 91%

Area map of mouse visual cortex

Wang

Burkhalter

2007

J of Comparative Neurology

450

670

View full text Add to dashboard Cite

show abstract

“…A continuous V2 adjoining the anterior or lateral border of V1 has also been found in several, but not all, mammals. Among rodents, for example, the rat (a myomorph rodent) and the degu (a caviomorph) (Olavarria and Mendez, 1979) lack a continuous V2.…”

Section: Evolution Of Motion Processing In Mammalsmentioning

confidence: 99%

Direction selectivity in the middle lateral and lateral (ML and L) visual areas in the California ground squirrel

Paolini

Sereno²

1998

Cerebral Cortex

View full text Add to dashboard Cite

Extracellular recordings obtained from the extrastriate cortex of the California ground squirrel, a diurnal sciurid, show that large receptive fields and a strong direction selectivity are present in the middle lateral area (ML) and the lateral area (L), located laterally to V2 and V3. Direction selectivity was tested by presenting stimuli of varying dimensions, shapes and speeds at different locations in the visual field. Most cells in ML and L (84%) were direction selective, with a preference for fast speeds, indicating that these areas share a role in motion processing. Areas ML and L may be homologous to area MT or may represent a case of homoplasia. A directional anisotropy for motion towards the vertical meridian was found in ML and L cells, suggesting that these areas may be involved in detecting predators and other moving objects coming from the periphery, rather than in processing flow fields caused by forward locomotion, for which a centrifugal bias might be expected.

show abstract

“…In this figure, the border of striate cortex (segmented line) was drawn from an adjacent, myelin-stained section. The injection of WGA-HRP fell in posterior striate cortex, in regions representing upper portions of the visual field (Olavarria and Mendez 1979). In accordance with the known organization of subcortical connections in the rat (e.g., Montero et al 1968 ;Siminoff et al 1966), the dorsal lateral geniculate nucleus (dLGN) in this Octodon contained deposits of both anterograde and retrogradely labeling restricted to its anterolateral portions, while the superior colliculus (SC) contained a field of anterograde labeling in its medial portions.…”

Section: Striate-peristriate Cortical Connectionsmentioning

confidence: 80%

“…This region coincides with a longitudinal sulcus (see Fig. 3A) and corresponds to the medial visual area described in area 18b (Olavarria and Mendez 1979). The remaining 7 fields, except for the most anterior one, fell in a strip of cortex lateral to area 17 that corresponds to area 18a of the rat.…”

Section: Striate-peristriate Cortical Connectionsmentioning

confidence: 99%

“…Physiological and anatomical studies suggest that arrangements of visual areas similar to that in the rat also exist in the mouse (Wagor et al 1980;Olavarria et al 1982;Simmons et al 1982;Olavarria and Montero 1989), golden hamster (Dursteler et al 1979), squirrel (Hall et al 1971; Montero and Cliffer 1981 ;Kaas et al 1989), and Octodon degus (Olavarria and Mendez 1979), raising the possibility that the visual cortex of all rodents is subdivided according to a common plan. In the present study we tested this hypothesis by comparing the visual plan in the rat to cortical subdivision schemes obtained from five native Chilean rodent species.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative study of visual inter and intrahemispheric cortico-cortical connections in five native Chilean rodents

1990

Self Cite

View full text Add to dashboard Cite

Previous studies of the visual cortical organization in the rat and other rodent species have raised the possibility that the visual cortical plan in the rat is common to a large number of species within the order. We have tested this idea by comparing the visual plan in the rat to cortical subdivision schemes obtained from five native Chilean rodent species, including members of the Cricetidae family within the Miomorph group, as well as from the Octodontidae family within the Caviomorph group. Cortical subdivision schemes were inferred from the analysis of the patterns of callosal connections revealed following multiple injections of HRP contralaterally, as well as from ipsilateral cortico-cortical connections observed after small injections of horseradish peroxidase conjugated with wheat germ agglutinin (WGA-HRP) into striate cortex. As in the rat, callosal connections in the native rodents concentrate at the border between cytoarchitectonic areas 17 and 18a, and along the borders of discrete, sparsely callosal islands of cortex in lateral peristriate cortex. Furthermore, single injections of WGA-HRP into striate cortex produce multiple, separate fields of labeled cells and terminations in the cortex surrounding area 17. Together, our data supports the idea of a common plan of visual cortical organization among rodents by providing evidence that the visual cortex in the native species is subdivided into multiple visual areas in a manner that resembles the rat cortical plan.

show abstract

The representations of the visual field on the posterior cortex of Octodon degus

Cited by 29 publications

References 9 publications

Area map of mouse visual cortex

Area map of mouse visual cortex

Direction selectivity in the middle lateral and lateral (ML and L) visual areas in the California ground squirrel

Comparative study of visual inter and intrahemispheric cortico-cortical connections in five native Chilean rodents

Contact Info

Product

Resources

About