Journal ArticleDOI
Colour Coding in the Superior Temporal Sulcus of Rhesus Monkey Visual Cortex
TLDR
It was concluded from these combined anatomico-physiological experiments that there are at least two distinct regions in the superior temporal sulcus which have different afferent connections and functional properties.Abstract:
In the rhesus monkey, the posterior bank of the superior temporal sulcus forms part of the prestriate visual cortex and has two regions, a medial one and a lateral one, which have their own separate callosal connections. The afferent input to these two regions was studied in experiments where the corpus callosum was sectioned, and labelled amino acids were injected into other visual areas. By this method, it was found that area 17 projects to that part of the superior temporal sulcus occupied by the more medial of the two callosal inputs. By contrast, the part of the sulcus occupied by the more lateral callosal input was found to receive a strong projection from the fourth visual complex, an area rich in colour-coded cells. Recordings were made from single cells in the superior temporal sulcus in animals in which the corpus callosum had been sectioned previously. The degeneration produced by this procedure was used to provide anatomical landmarks enabling us to assign cells to the lateral or the medial regions of the sulcus. Such recordings revealed that receptive fields were topographically organized in the lateral part of the sulcus and that most cells were colour specific. By contrast, cells recorded from in the region of the more medial callosal patch within this sulcus were directionally selective, without any obvious colour coding. It was concluded from these combined anatomico-physiological experiments that there are at least two distinct regions in the superior temporal sulcus which have different afferent connections and functional properties.read more
Citations
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Journal ArticleDOI
A direct demonstration of functional specialization in human visual cortex
Semir Zeki,John D.G. Watson,Christian J. Lueck,Karl J. Friston,C. Kennard,Richard S. J. Frackowiak +5 more
TL;DR: PET is used to demonstrate directly the specialization of function in the normal human visual cortex, and provides direct evidence to show that, just as in the macaque monkey, different areas of the human prestriate visual cortex are specialized for different attributes of vision.
Journal ArticleDOI
Area V5 of the Human Brain: Evidence from a Combined Study Using Positron Emission Tomography and Magnetic Resonance Imaging
John D.G. Watson,Ralph Myers,Richard S. J. Frackowiak,Joseph V. Hajnal,Roger P. Woods,John C. Mazziotta,Stewart Shipp,Semir Zeki +7 more
TL;DR: P positron emission tomography was used to determine the foci of relative cerebral blood flow increases produced when subjects viewed a moving checkerboard pattern, compared to viewing the same pattern when it was stationary.
Journal ArticleDOI
Direction and orientation selectivity of neurons in visual area MT of the macaque
TL;DR: The notion that area MT represents a further specialization over area V1 for stimulus motion processing is supported and the marked similarities between direction and orientation tuning in area MT in macaque and owl monkey support the suggestion that these areas are homologues.
Journal ArticleDOI
Laminar origins and terminations of cortical connections of the occipital lobe in the rhesus monkey.
TL;DR: Different cortical projection systems are characterized by specific laminar distributions of efferent terminations as well as of their neurons of origin.
Journal ArticleDOI
Functional specialisation in the visual cortex of the rhesus monkey
TL;DR: Anatomical and functional studies of the visual cortex of the rhesus monkey have shown that it is made up of a multiplicity of distinct areas that seem to be functionally specialised to analyse different features of thevisual environment.
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David H. Hubel,Torsten N. Wiesel +1 more
TL;DR: Random-dot stereoscopic patterns have been used to provide behavioural evidence of stereoscopic vision in macaque monkeys and cells sensitive to binocular depth have been found in area 18 of the macaque monkey cortex.
Journal ArticleDOI
Colour coding in rhesus monkey prestriate cortex.
TL;DR: The response properties of units to simple visual stimulation in another prestriate area, the fourth visual area (V4), is reported, which lies in the anterior bank of the lunate sulcus dorsally and emerges ventrally in the posterior bank ofthe inferior occipital sulcus.