Abstract:
:Recurrent projections comprise a universal feature of cerebral organization. Here, we show that the corticofugal projections from the striate cortex (VI) to the lateral geniculate nucleus (LGN) robustly and multiplicatively enhance the responses of parvocellular neurons, stimulated by gratings restricted to the classical receptive field and modulated in luminance, by over two-fold in a contrast-independent manner at all but the lowest contrasts. In the equiluminant plane, wherein stimuli are modulated in chromaticity with luminance held constant, such enhancement is strongly contrast dependent. These projections also robustly enhance the responses of magnocellular neurons but contrast independently only at high contrasts. Thus, these results have broad functional significance at both network and neuronal levels by providing the experimental basis and quantitative constraints for a wide range of models on recurrent projections and the control of contrast gain.
journal_name
Vis Neuroscijournal_title
Visual neuroscienceauthors
Przybyszewski AW,Gaska JP,Foote W,Pollen DAdoi
10.1017/s0952523800174012subject
Has Abstractpub_date
2000-07-01 00:00:00pages
485-94issue
4eissn
0952-5238issn
1469-8714pii
S0952523800174012journal_volume
17pub_type
杂志文章abstract::Ganglion cells of the cat retina that are neither alpha nor beta cells are often lumped for convenience into a single anatomical group--the gamma cells (Boycott & Wässle, 1974; Stone, 1983; Wässle & Boycott, 1991). Defined in this way, gamma cells are the morphological counterpart to the physiological W-cell class, wh...
journal_title:Visual neuroscience
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abstract::The activity of the endogenous retinal dopamine (DA) pathway has been examined in the pigmented rat using retinas obtained from normal adult (approximately 3 months) and senile adults (approximately 24 months) using an in vitro electrophysiological approach. By comparing the pharmacological sensitivity of the horizont...
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pub_type: 杂志文章,评审
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abstract::This study of the tree shrew, Tupaia belangeri, provides evidence for an intracollicular pathway that arises in the superficial gray layer and terminates in the optic layer. As a first step, Nissl, myelin, and cytochrome oxidase stains were used to identify the layers of the superior colliculus in the tree shrew. Seco...
journal_title:Visual neuroscience
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abstract::The recent isolation of at least five different cDNAs encoding functional subunits of glutamate receptors (GluR1 to GluR5) has revealed a diversity whose function is not understood. To learn more about how these different receptor subunits are used in the brain, we undertook an in situ hybridization study of the retin...
journal_title:Visual neuroscience
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journal_title:Visual neuroscience
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更新日期:1998-01-01 00:00:00
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journal_title:Visual neuroscience
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journal_title:Visual neuroscience
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更新日期:2002-09-01 00:00:00
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journal_title:Visual neuroscience
pub_type: 杂志文章,评审
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journal_title:Visual neuroscience
pub_type: 杂志文章,评审
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