The response delay to left target stimuli preceded by right-side cues, first described by Posner et al. [J. Neurosci. 4 (1984) 1863-1874] appears to be a stable marker of right-parietal injury. However, only few studies compared @entity1 ' performance to age-matched controls. Furthermore, only few studies compared visual and auditory stimuli in this task. Therefore, two groups of right-hemisphere @entity64 @entity1 , with and without left visual hemineglect, and a healthy control group were studied in three versions of Posner's paradigm. Visual or auditory target stimuli were presented to the subject's left or right, following a @entity227 cue by 150 ms. The classical 'extinction-type' effect, an increase in missing responses for right visual cue/left visual target, was specifically observed in neglect @entity1 . In the same condition, an 'extinction-type' response delay was present in @entity1 with neglect and in those without neglect. No such delay occurred in any group when cues were auditory. Specifically in neglect @entity1 , response times were generally longer for left than for right visual targets, regardless of cue side and of cue modality. Response times were generally prolonged in neglect @entity1 regardless of target modality. This suggests that three components impair neglect @entity1 ' performance in this paradigm: a non-spatial, supramodal deficit, a global, neglect-type deficit of the contralesional hemi-field, and the extinction-type impairment. The latter two deficits appear to be most marked within the visual domain.

Effects of same- and different-modality cues in a Posner task: extinction-type, spatial, and non-spatial deficits after right-hemispheric XXXX .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity227 :: ('MESH:D014786', 'Disease') :: ['visual or auditory'] @entity64 :: ('MESH:D020521', 'Disease') :: ['stroke']
@entity64 :: (MESH:D020521,Disease) :: ['stroke']
