scholarly journals The cortical projections of foveal striate cortex in the rhesus monkey.

1978 ◽  
Vol 277 (1) ◽  
pp. 227-244 ◽  
Author(s):  
S M Zeki
Keyword(s):  
Rhesus Monkey ◽  
Striate Cortex ◽  
Cortical Projections

The distribution of corticotectal projection neurons correlates with the interblob compartment in macaque striate cortex

1996 ◽  
Vol 13 (3) ◽  
pp. 461-466 ◽  
Author(s):  
Barry Lia ◽  
Jaime F. Olavarria
Keyword(s):  
Cross Correlation ◽  
Random Distribution ◽  
Striate Cortex ◽  
Projection Neurons ◽  
Chi Square ◽  
Cortical Projections ◽  
Cross Correlation Analysis ◽  
Chi Square Analysis ◽  
Relationship Of ◽  
The Relationship

AbstractWhile much attention has been given to the correlation between cytochrome-oxidase (CO) compartments and patterns of cortico-cortical projections originating from supragranular layers in the striate cortex, little is known in this regard about patterns of cortico-subcortical projections originating from infragranular cortex. We studied the tangential distribution of the striate cortex neurons projecting to the superior colliculus and used two approaches to analyze the relationship of this distribution to the arrangement of CO “blobs.” First, chi-square analysis indicated that significantly fewer labeled neurons were found within the CO blob compartment than the number expected for a random distribution. Second, spatial cross-correlation analysis – which circumvents the inherent subjectivity of delineating blob boundaries – revealed an area around blob centers in which there was a decreased probability of encountering labeled cells. The size of this area compared well with that of our outlines of CO blobs. We conclude that corticotectal projection neurons in the striate cortex are distributed preferentially within the interblob compartment of the infragranular striate cortex. These results demonstrate that the spatial distribution of cortico-subcortical projection neurons within infragranular cortex can correlate with the CO architecture of the primary visual cortex.

Visual aftereffects and the consequences of visual system lesions on their perception in the rhesus monkey

1994 ◽  
Vol 11 (4) ◽  
pp. 643-665 ◽  
Author(s):  
Peter H. Schiller ◽  
Robert P. Dolan
Keyword(s):  
Rhesus Monkey ◽  
Visual System ◽  
Lateral Geniculate Nucleus ◽  
Striate Cortex ◽  
Luminance Contrast ◽  
Repeated Exposure ◽  
Lateral Geniculate ◽  
Central Factors

AbstractThis study examined the consequences of visual system lesions on visual aftereffects produced by achromatic stimuli of various luminance contrasts and chromatic stimuli of various wavelength compositions. The effects of repeated exposure to such adapting stimuli were assessed using probes whose luminance contrast and wavelength composition were systematically varied using both detection and discrimination paradigms. Interocular tests revealed that both peripheral and central mechanisms contribute to the visual aftereffects produced by the adapting stimulus arrays used in this study. Contrary to the hypothesis according to which the midget system of the retina is the conveyor of visual afterimages, we found that blocking this system with lesions of parvocellular lateral geniculate nucleus, through which the midget cells make their way to the striate cortex in primates, did not eliminate the visual aftereffects. It appears therefore that the parasol system of the retina, which courses through the magnocellular layers of the lateral geniculate nucleus to cortex, can convey the necessary signals for the generation of visual aftereffects. Lesions of areas V4 and MT did not have significant effects on the visual aftereffects studied suggesting that the central factors that contribute to the visual aftereffects occur either already in area VI or are conveyed to higher centers through regions other than areas V4 and MT.

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