Perceiving an entire object and grasping only half of it.

Full Abstract

A single case study is presented of an unusual dissociation between the sensory perception of an object and the grasping action towards the same object. The patient IW was found at age 74 to have spent all his life without the left parietal lobe, as a result of a congenital peri-natal insult. IW does not show any signs of sensory dysfunction, but he has a persistent motor bias that arises during movement towards objects. When IW was required to reach and grasp stationary and rotating objects, he consistently grasped the objects to the left side. Thus, it appears that information that is available at a sensory level can nevertheless be unavailable at a motor level. Our findings not only help to clarify the functions of the parietal lobe, but also show that lesions in this area are linked specifically to a process of response performance, which is fundamental for our understanding of visuomotor control.

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Author information

Author/s: Castiello, U (U); Paine, M (M); Wales, R (R);

Affiliation: Department of Psychology, Royal Holloway, University of London, Egham, Surrey TW20 0EX, London, UK. u.castiello(-atsign-)rhul.ac.uk

Journal and publication information

Publication Type: Case Reports; Journal Article; Research Support, Non-U.S. Gov't

Journal: Neuropsychologia (Neuropsychologia), published in England. (Language: eng)

Reference: 2002-; vol 40 (issue 2) : pp 145-51

Dates: Created 2001/10/19; Completed 2002/01/04; Revised 2006/11/15;

PMID: 11640937, status: MEDLINE (last retrieval date: 12/26/2008)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Aged
Biomechanics
Functional Laterality
Humans
Male
Motor Skills Disorders - physiopathology

Motor Skills Disorders - physiopathology
Parietal Lobe - injuries; pathology; physiology
Task Performance and Analysis
Tomography, X-Ray Computed
Touch
Visual Perception

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