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The dorsal stream is a pathway for visual information which flows through the visual cortex, the part of the brain which provides visual processing. It is involved in spatial awareness: recognizing where objects are in space. The dorsal stream is one of two main pathways of the visual cortex, the other being the ventral stream.
Additional recommended knowledge
Where it is located
The dorsal stream (also known as the parietal stream or the "where" stream) stretches from the primary visual cortex (V1) in the occipital lobe forward into the parietal lobe. It is interconnected with the parallel ventral stream (the "what" stream) which runs downward from V1 into the temporal lobe. An influential early review on the subject was published by Goodale and Milner in 1992.
The neuroscience community is still not in agreement regarding the degree to which these streams are segregated (they are interconnected) or the functional significance which should be attached to them.
The dorsal stream is involved in spatial awareness and guidance of actions (e.g., reaching). In this it has two distinct functional characteristics-it contains a detailed map of the visual field, and is also good at detecting and analysing movements.
The dorsal stream commences with purely visual functions in the occipital lobe before gradually transferring to spatial awareness at its termination in the parietal lobe.
The posterior parietal cortex is essential for, "the perception and interpretation of spatial relationships, accurate body image, and the learning of tasks involving coordination of the body in space"
It contains individually functioning lobules, one area of which contains neurons that produce enhanced activation when attention is moved onto the stimulus (LIP), and another section where visual and somatosensory information are integrated (VIP).
Effects of damage or lesions
Damage to the posterior parietal cortex causes a number of spatial disorders including:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dorsal_stream". A list of authors is available in Wikipedia.|