Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

Avoidance of obstacles in the absence of visual awareness.

McIntosh, R. D. and McClements, K. I. and Schindler, I. and Cassidy, T. P. and Birchall, D. and Milner, A. D. (2004) 'Avoidance of obstacles in the absence of visual awareness.', Proceedings of the Royal Society series B : biological sciences., 271 (1534). pp. 15-20.

Abstract

The spatial character of our reaching movements is extremely sensitive to potential obstacles in the workspace. We recently found that this sensitivity was retained by most patients with left visual neglect when reaching between two objects, despite the fact that they tended to ignore the leftward object when asked to bisect the space between them. This raises the possibility that obstacle avoidance does not require a conscious awareness of the obstacle avoided. We have now tested this hypothesis in a patient with visual extinction following right temporoparietal damage. Extinction is an attentional disorder in which patients fail to report stimuli on the side of space opposite a brain lesion under conditions of bilateral stimulation. Our patient avoided obstacles during reaching, to exactly the same degree, regardless of whether he was able to report their presence. This implicit processing of object location, which may depend on spared superior parietal-lobe pathways, demonstrates that conscious awareness is not necessary for normal obstacle avoidance.

Item Type:Article
Additional Information:
Keywords:Visual extinction, Consciousness, Visuomotor control, Spatial localization.
Full text:Full text not available from this repository.
Publisher Web site:http://dx.doi.org/10.1098/rspb.2003.2545
Record Created:22 Mar 2007
Last Modified:03 Jul 2009 16:22

Social bookmarking: del.icio.usConnoteaBibSonomyCiteULikeFacebookTwitterExport: EndNote, Zotero | BibTex
Usage statisticsLook up in GoogleScholar | Find in a UK Library