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- W644946 startingPage "41" @default.
- W644946 abstract "Unilateral neglect may be considered with reference to several spatial-coordinate systems, e.g., those relating to the body midline, head and retina, and seems to involve alterations in the deployment of attention. Left hemineglect may be more frequent or, possibly, merely more salient than right hemineglect, perhaps because of asymmetries in the representation of extracorporeal space. In normal subjects we have reported a number of analogous phenomena. Visually presented lines or tactually/kinesthetically presented rods were typically transected slightly to the left of the true midpoint, an effect which could be manipulated by varying the salience of the two extremities. In a variety of tactuomotor tasks involving the fingers, the position in space to left or right of the body was found to be more important than the actual hand (left or right) employed, which was placed either on its own side of the body or across the midline to the opposite side. In vibrotactile reaction time experiments, performance was also found to be determined by the position of the responding hand, though hand asymmetries replaced hemispace asymmetries under conditions of stimulus uncertainty. In the auditory modality, it was the position, real or perceived (as under conditions of visual capture) of a sound source (loudspeaker) which determined performance asymmetries. In all these experiments asymmetries were lost by dissociating the head and body coordinate systems, through the maintenance of a 90° head turn to left or right, or by the dissociation of the gravitational and corporeal coordinate systems, when lying horizontallly upon the left or right side. The hemispheres may map both proximal sensory (and motor) events involving the body surface and more distal events occurring out in extracorporeal space. These two representations may be experimentally dissociated." @default.
- W644946 created "2016-06-24" @default.
- W644946 creator A5011877465 @default.
- W644946 creator A5014014907 @default.
- W644946 creator A5042908354 @default.
- W644946 creator A5058029125 @default.
- W644946 creator A5061712030 @default.
- W644946 date "1987-01-01" @default.
- W644946 modified "2023-09-27" @default.
- W644946 title "Coordinates of Extracorporeal Space" @default.
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- W644946 doi "https://doi.org/10.1016/s0166-4115(08)61708-2" @default.