Results 171 to 180 of about 1,838,307 (237)

The nature of the visual discrimination impairment after neonatal or adult ablation of superior colliculi in rats

Experimental Brain Research, 1986
The superior colliculi were removed in rats at either one or five days of age or in adulthood. Seven months later they were tested on four successively presented two-choice intensity discriminations. The intensity difference between the discriminanda was reduced across the four problems to encourage choice by comparison.
C.A. Heywood, Alan Cowey
semanticscholar   +4 more sources

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Superior colliculi and their fiber connections in the rat

Journal of Comparative Neurology, 1930
J. W. Papez, G. L. Freeman
semanticscholar   +2 more sources

Inferior and Superior Colliculi

, 1992
In the classical neuroanatomical literature, the inferior and superior colliculi, located on the roof of the midbrain, are grouped together as the corpora quadrigemina. However, modern research indicates that these structures have quite different functions.
D. Oliver, M. F. Huerta
semanticscholar   +2 more sources

Contribution of the superior colliculi to post-stroke unilateral spatial neglect and recovery

Neuropsychologia, 2010
Unilateral spatial neglect (USN) is a highly prevalent and disabling consequence of stroke that often responds poorly to existing interventions. Its underlying neural mechanisms are still unclear. Recent work suggests that post-stroke USN may be partly related to a disruption of top-down and bottom-up control of visual attention mediated in part ...
Tatiana Ogourtsova, N. Korner-Bitensky, A. Ptito   +2 more
semanticscholar   +3 more sources

Scrapie inoculation of mice: light and electron microscopy of the superior colliculi

Acta Neuropathologica, 2004
Ultrastructural examination of the superior colliculi of mice intraocularly inoculated with the ME7 strain of scrapie showed vacuolation early in the course of infection. Brains were examined between 85-260 days after monocular inoculation with scrapie. The mean incubation period for the development of clinical disease was 302 days.
M. Jeffrey, J. Scott, H. Fraser
semanticscholar   +3 more sources

Morphological and electrophysiological characteristics of the commissural system in the superior colliculi for control of eye movements.

Progress in Brain Research, 2019
Commissural connections between the superior colliculi (SCs) were well known anatomically, and assumed to be only inhibitory in relation to visual inputs. However, by recording intracellular potentials, we revealed that a strong monosynaptic excitatory commissural connection exists between the rostral SCs of the cat.
M. Takahashi
semanticscholar   +3 more sources

Neurogenetic gradients in the superior and inferior colliculi of the rhesus monkey

Journal of Comparative Neurology, 1981
AbstractThe spatiotemporal patterns of neurogenesis in the superior colliculus (SC) and inferior colliculus (IC) were analyzed by plotting the positions of heavily labeled neurons in autoradiograms from a series of rhesus monkeys that had been exposed to 3H‐thymidine at various embryonic (E) days and killed either shortly thereafter or at 2–3 months ...
Michael Lee Cooper, Pasko Rakić
openalex   +3 more sources

Organization and origin of the connection from the inferior to the superior colliculi in the rat

Journal of Comparative Neurology, 2006
AbstractThe inferior colliculus (IC) is the main ascending auditory relay station prior to the superior colliculus (SC). The morphology and origin of the connection from inferior to superior colliculus (I‐SC) was analyzed both by anterograde and retrograde tracing.
G. García del Caño, I. Gerrikagoitia, Amaya Alonso-Cabria, L. Martı́nez-Millán   +3 more
semanticscholar   +3 more sources

Spatiotemporal patterns of ontogenetic expression of parvalbumin in the superior colliculi of rats and rabbits

The Journal of Comparative Neurology, 1998
We have examined the development of parvalbumin immunoreactivity in the superior colliculi (SC) of the perinatal and mature rats and rabbits. In mature animals, parvalbumin-expressing cells (PECs) and neuropil in the retinorecipient layers were distributed in a continuous single band extending throughout the entire extent of the colliculus, whereas ...
D. Barker, Bogdan Dreher
semanticscholar   +3 more sources

Functional MRI of postnatal visual development in normal and hypoxic–ischemic-injured superior colliculi

NeuroImage, 2010
The superior colliculus (SC) is a laminated subcortical structure in the mammalian midbrain, whose superficial layers receive visual information from the retina and the visual cortex. To date, its functional organization and development in the visual system remain largely unknown.
Kevin C. Chan, K. Xing, M. Cheung, I. Zhou, E. Wu   +4 more
semanticscholar   +5 more sources