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  • Primates  (2)
  • 1970-1974  (2)
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  • 1970-1974  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Mesencephalic control of lateral geniculate nucleus in primates. II. Effective loci (1973)
    Springer
    Experimental brain research 18 (1973), S. 204-213 
    Details
    ISSN: 1432-1106
    Keywords: Lateral geniculate nucleus ; Mesencephalic reticular formation ; Pontine reticular formation ; Visual system ; Primates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Under barbiturate anesthesia the brain stem of squirrel monkeys was explored for points from which stimulation could influence synaptic transmission through the lateral geniculate nucleus. The central region of the mesencephalic reticular formation was clearly the most effective site. Other effective loci were in the pontine reticular formation, pretectal area and brachium of the superior colliculus. Considerably less effective was stimulation of the superior colliculus or central gray. Except for the region of the corticotectal tract as it passes through the pulvinar, stimulation of the diencephalon up to the level of A8 was without effect. The limited extent of the effective regions, the bilaterality of their influence, and the fact that when inhibitory and facilitatory effects were both obtained, they were maximal from the same locus, all suggest that a single functional system was engaged. However, purely inhibitory effects were sometimes obtained and are difficult to account for on the basis of a single system even though they originated from the same general area which gave the more common biphasic effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234724
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mesencephalic control of lateral geniculate nucleus in primates. III. Modifications with state of alertness (1973)
    Springer
    Experimental brain research 18 (1973), S. 214-224 
    Details
    ISSN: 1432-1106
    Keywords: Lateral geniculate nucleus ; Mesencephalic reticular formation ; Visual system ; Primates ; Sleep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Transmission through the lateral geniculate nucleus (LGN) undergoes large, sudden changes, as does excitability of striate cortex, in unanesthetized macaques and squirrel monkeys. Tactile or auditory stimuli, or brief stimulation of the mesencephalic reticular formation has a pronounced facilitatory effect if the monkey is moderately inattentive. However, when the monkey is fully alert, the mesencephalic stimulation may produce no enhancement. During slow-wave sleep, transmission through LGN is greatly curtailed, but excitability of striate cortex is dramatically augmented. Anesthesia, on the other hand, severely depresses both LGN and striate cortex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234725
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
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