Abstract:
:In previous work, we have shown that sudden image displacements well outside the classical receptive field modulate the visual sensitivity of LGN relay cells. Here we report the effect of image displacements on the response versus contrast function. The stimuli consisted of a central spot of optimal size and polarity (contrast range: 3-98%), flashed alone or in the presence of a peripheral annulus (radii: 5-15 deg) containing a low spatial-frequency grating displaced at saccade-like velocities (shift). The most consistent effect of the shift on the response to a central spot was to reduce the responsiveness of Y relay cells and, to a lesser extent, of X relay cells. The reduction in responsiveness was primarily a divisive rather than a subtractive effect and could be modelled by assuming that a greater contrast was required to produce a given excitatory response. In the absence of a central spot, remote motion had inhibitory effects on the firing rates of the majority of relay cells, but its effect on retinal ganglion cells was mainly excitatory. When the shifting grating covered the classical receptive field and its periphery, facilitatory effects or suppressive effects, depending on the spatial phase of the pattern, were observed in both retinal and geniculate cells. Remote motion strongly suppresses the responsiveness of relay cells to stimuli within the classical receptive field. This suppressive effect involves intrageniculate processing and is primarily associated with a reduction in contrast gain. It is likely that shift suppression contributes to the loss of visual sensitivity observed in saccadic suppression.
journal_name
Vis Neuroscijournal_title
Visual neuroscienceauthors
Felisberti F,Derrington AMdoi
10.1017/s0952523899165143subject
Has Abstractpub_date
1999-09-01 00:00:00pages
943-56issue
5eissn
0952-5238issn
1469-8714pii
S0952523899165143journal_volume
16pub_type
杂志文章abstract::During early mammalian development, inputs from the two retinas intermix within the lateral geniculate nucleus (LGN), then segregate during the first postnatal week into layers that receive input from a single retina. Functionally, the LGN also changes markedly during the first postnatal month; early geniculate respon...
journal_title:Visual neuroscience
pub_type: 杂志文章
doi:10.1017/s0952523899163107
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journal_title:Visual neuroscience
pub_type: 杂志文章
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journal_title:Visual neuroscience
pub_type: 杂志文章
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journal_title:Visual neuroscience
pub_type: 杂志文章
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journal_title:Visual neuroscience
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更新日期:2006-01-01 00:00:00
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更新日期:1993-03-01 00:00:00
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pub_type: 杂志文章
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journal_title:Visual neuroscience
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journal_title:Visual neuroscience
pub_type: 杂志文章,评审
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更新日期:2002-07-01 00:00:00
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journal_title:Visual neuroscience
pub_type: 杂志文章
doi:10.1017/s0952523800009524
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journal_title:Visual neuroscience
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doi:10.1017/S0952523808080954
更新日期:2009-03-01 00:00:00
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pub_type: 杂志文章
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journal_title:Visual neuroscience
pub_type: 杂志文章
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journal_title:Visual neuroscience
pub_type: 杂志文章,评审
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更新日期:1989-12-01 00:00:00
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journal_title:Visual neuroscience
pub_type: 杂志文章
doi:
更新日期:2001-11-01 00:00:00