Unilateral spatial neglect (USN) is a common sequel of stroke associated with poor rehabilitation outcome. It results from impaired processing within a network that controls spatial attention, and is more frequent, long-standing and severe following right-hemisphere damage (RHD).
Aim: To examine the importance of spatial location (left/right) vs. temporal order (first/last) parameters, in conditions where visual and tactile objects have to be reconstructed mentally following sequential presentation of their parts in mid-sagittal position.
Method: 35 first-event RHD stroke patients with left USN and 29 healthy controls were presented with pairs of 2D geometrical shapes for same/different judgment, in 3 testing conditions: a. 'visual static' [VS] – each object exposed in its entirety; b. 'visual dynamic' [VD] – objects moved horizontally (leftward/rightward) behind a central narrow slit exposing only part of the object at one time; c. 'tactile dynamic' [TD] – the upper contour of objects, similar in appearance to the visual objects, are palpated by the blindfolded participant in both rightward and leftward directions, with the index finger of the right hand. In tasks b and c the spatial representation has to be reconstructed mentally from partial, non-lateralized, sensory information.
. Access to conscious awareness in USN depends on both the spatial and temporal tags of an object. Better understanding of the brain mechanisms underlying the variety of neglect manifestations is mandatory for development of efficient rehabilitation tools to reduce neglect-related disability.
Lihi Isidora Mansano– Dr (medical resident), Beit Loewenstein Rehabilitation hospital, Ra'anana, Israel
Corrine Serfaty– head of neurological rehabilitation department, Beit Loewenstein Rehabilitation hospital, Ra'anana, Israel
Yaron Sacher– Head of TBI Rehabilitation Department, Beit Loewenstein Rehabilitation hospital, Ra'anana, Israel
Nachum Soroker– Head of Research unit, Neurological Rehabilitation department, Beit Loewenstein Rehabilitation hospital, Ra'anana, Israel