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Recent evidence has shown that inhibition of return, IOR, is impaired in patients with parietal damage with or without clinical signs of neglect (Bartolomeo, Sieroff, Decaix, & Chokron, 2001; Vivas, Humphreys, & Fuentes, 2003, respectively). In addition to environment-based IOR, Tipper et al. (1991) showed that IOR could be also associated with dynamic, object-based representations. In our study, we examined four patients with unilateral lesions to the parietal lobe, and a group of healthy controls, in an IOR procedure with moving objects where a pre-cued object could move, clockwise or counterclockwise, 90 degrees in polar coordinates. The group of control participants showed a small but significant object-based IOR effect. In contrast, the patients showed an object-based IOR effect when the objects moved from the contralesional field toward the ipsilesional field, whereas there was no IOR effect when they moved from the ipsilesional to the contralesional field. These findings are discussed in terms of the role of the parietal cortex in implementing attentional biases in both environment-based (Vivas et al., 2003) and object-based frames of reference.

Original publication

DOI

10.1037/0894-4105.22.2.169

Type

Journal article

Journal

Neuropsychology

Publication Date

03/2008

Volume

22

Pages

169 - 176

Keywords

Aged, Attention, Cues, Female, Fixation, Ocular, Functional Laterality, Humans, Hypoxia, Brain, Intracranial Aneurysm, Male, Middle Aged, Parietal Lobe, Photic Stimulation, Psychomotor Performance, Reaction Time, Stroke, Visual Perception