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Perception, Action, and ConsciousnessSensorimotor Dynamics and Two Visual Systems$
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Nivedita Gangopadhyay, Michael Madary, and Finn Spicer

Print publication date: 2010

Print ISBN-13: 9780199551118

Published to Oxford Scholarship Online: January 2011

DOI: 10.1093/acprof:oso/9780199551118.001.0001

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Mapping the neglect syndrome onto neurofunctional streams

Mapping the neglect syndrome onto neurofunctional streams

(p.183) Chapter 11 Mapping the neglect syndrome onto neurofunctional streams
Perception, Action, and Consciousness

Vallar Giuseppe

Mancini Flavia

Oxford University Press

This chapter provides an overview of the syndrome of unilateral spatial neglect (USN) as a multicomponent deficit, focusing on the distinction between its ‘perceptual’ and ‘premotor’ impairments, as well as on related evidence from the processing of visual illusions. It compares the USN syndrome, and its neural correlates with the two disorders representing the neuropsychological counterparts of vision-for-perception (the ‘ventral’ stream), and of vision-for-action (the ‘dorsal’ stream). From the neuropsychological vantage-point of USN, the chapter takes the view that the two visual streams dichotomy — both in the original version of Ungerleider and Mishkin (1982), and in the development by Milner and Goodale — captures only partially the neural loops concerned with perception and action in the visual domain. The syndrome of USN suggests the existence of a neural system supporting perceptual awareness in spatial reference frames, for vision, and for other sensory modalities, as well as goal-directed, intentional action in the space surrounding us. A third, dorsal-ventral, stream, including the inferior parietal lobule, and the ventral premotor cortex, may constitute the neural underpinnings of spatial awareness for perception and action.

Keywords:   unilateral spatial neglect syndrome, perception, action, visual streams, perceptual awareness, dorsal-ventral stream

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