Visuospatial neglect can be defined as the tendency for decreasing motor behaviors toward orienting to, searching for, and finding stimuli on the opposite hemispace
of brain damage, as well as error tendency in reacting to or reporting orally and/or not being aware of stimuli on the left visual hemispace
We also demonstrated somatosensory ERPs of some of our patients who showed different responses elicited by low intensity electrical stimulation of the median nerve at the wrist depending on the location of the hands either in uncrossed anatomical position or crossed over the body midline to the other hemispace
Judgments made on chi meric faces elicit reliably a perceptual bias to the left hemispace
, presumed to be due to right hemisphere dominance for emotional processes.
Orientational bias model of unilateral neglect: evidence from attentional gradients within hemispace
Contraversive Pushing and Inattention of the Controlesional Hemispace
Persons with visual neglect have significant difficulty reacting to or lose the ability to react to or process visual input in the hemispace
contralateral to the lesion.
Individuals with sensory extinction do not neglect contralesional stimuli unless they are paired with an equal, simultaneous stimulus in the ipsilesional hemispace
(Robertson & Halligan, 1999).
Pseudoneglect: effects of hemispace
on a tactile line bisection task.
Dopamine agonists reorient visual exploration away from the neglected hemispace
In this model each hemisphere of the brain directs attention toward contralateral hemispace
by inhibiting the other hemisphere; however the left hemisphere is considered to have a stronger orienting tendency than the right.
Instead, the directional dependence of our findings seems to indicate functional specializations associated with left and right visual fields, as cursor orientation affected movements into the left hemispace
that has superiorities in visuospatial processing (Bryden, 1988), whereas movement amplitude affected initiation and overshooting of movements into the right hemispace
During unimanual reaches, they reached using either their right or left hand, for a single target object presented in the appropriate hemispace