Abstract:
:Electrical stimulation with repetitive pulses (6/sec) was applied to the internal medullary lamina and produced tonic contraversive turning movements of eyes and head which were associated with recruiting responses in the visual cortex. Optical gratings of a spatial frequency of 0.5 c/deg which alternated with diffuse illumination of equal intensity were then presented to the animal during conjugated adversive eye movements induced by intralaminar stimulation with continuous sine-wave alternating currents of 5000 c.p.s. The head of the animal was fixed except for rotation in the horizontal plane. Prior to intralaminar stimulation it was turned in the direction opposite to the induced eye movements so that the animal always viewed the central area of the screen. The potential recorded in the visual cortex in response to the gratings consisted of an initial positive-negative potential of the order of 20 muV followed by later deflections of irregular shape. The size of this initial potential was measured during induced gazing and in the absence of intralaminar stimulation. A significantly greater potential in response to the gratings was found during gazing. Diminishing the visual acuity of the animal resulted in a marked decrease of the initial potential and in this condition very little increase was obtained during gazing. No enhancement of the potential was seen when stimulation was applied to other thalamic structures that yielded no visual orientation. It is concluded that perception of contrast is improved during visual orientation and that the effect is due to a concomitant activation of unspecific intralaminar afferents to the visual cortex.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Hunsperger RW,Roman Ddoi
10.1007/BF00234015subject
Has Abstractpub_date
1976-06-18 00:00:00pages
231-46issue
3eissn
0014-4819issn
1432-1106journal_volume
25pub_type
杂志文章abstract::In the Brentano version of the Müller-Lyer illusion one part looks longer and the other looks shorter than it really is. We asked participants to make saccadic eye movements along these parts of the figure and between positions on the figure and a position outside the illusion. By showing that saccades from outside th...
journal_title:Experimental brain research
pub_type: 杂志文章
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journal_title:Experimental brain research
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journal_title:Experimental brain research
pub_type: 杂志文章,随机对照试验
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journal_title:Experimental brain research
pub_type: 杂志文章
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journal_title:Experimental brain research
pub_type: 杂志文章
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journal_title:Experimental brain research
pub_type: 杂志文章
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更新日期:1982-01-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
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更新日期:1993-01-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
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更新日期:2010-05-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
doi:10.1007/BF00238283
更新日期:1976-09-24 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
doi:10.1007/s00221-020-06009-0
更新日期:2021-01-04 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
doi:10.1007/s00221-020-05878-9
更新日期:2020-10-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
doi:10.1007/BF00261356
更新日期:1985-01-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
doi:10.1007/BF00237473
更新日期:1986-01-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
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更新日期:2014-07-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
doi:10.1007/BF00238380
更新日期:1981-01-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
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更新日期:1988-01-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
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journal_title:Experimental brain research
pub_type: 杂志文章
doi:10.1007/BF00608257
更新日期:1990-01-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
doi:10.1007/BF00253624
更新日期:1989-01-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
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更新日期:1984-01-01 00:00:00
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更新日期:2018-10-01 00:00:00
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journal_title:Experimental brain research
pub_type: 杂志文章
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更新日期:1979-01-15 00:00:00
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journal_title:Experimental brain research
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更新日期:2018-05-01 00:00:00