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Different left brain regions are essential for grasping a tool compared with its subsequent use
Jennifer Randerath1, Georg Goldenberg, Will Spijkers
1Clinical Neuropsychology Research Group (EKN), München-Bogenhausen Hospital, Munich, Germany. J_Randerath@hotmail.com
Neuroimage
|July 6, 2010
Summary
Patients with left brain damage (LBD) show deficits in tool use and grasping. Specific brain regions like the inferior frontal gyrus (IFG) and supramarginal gyrus (SMG) are crucial for tool selection and action planning.
Area of Science:
- Neuroscience
- Cognitive Neurology
- Neuropsychology
Background:
- Tool use relies on a left-hemisphere network involving frontal, temporal, and parietal regions.
- Left brain damage (LBD) can cause apraxia, impairing tool use and sometimes grasping movements.
Purpose of the Study:
- To investigate the specific neural correlates of tool use impairments and erroneous grasping in LBD patients.
- To differentiate the roles of distinct left-hemisphere regions in tool selection, grasping, and action planning.
Main Methods:
- Neuroimaging analysis of lesion locations in 42 LBD patients and 18 healthy controls.
- Behavioral assessment of tool grasping and demonstration of tool use.
- Lesion overlay analysis to identify overlapping damaged areas associated with specific deficits.
Main Results:
- Tool use impairment in 22 LBD patients showed lesion overlap primarily in the left supramarginal gyrus (SMG).
- Erroneous grasping in 12 LBD patients was linked to lesions in the left inferior frontal gyrus (IFG) and angular gyrus (ANG).
- Distinct lesion areas for grasping errors and general tool use impairment suggest specialized functions.
Conclusions:
- The left IFG appears critical for selecting appropriate grasping movements based on task demands and tool properties.
- The angular gyrus (ANG) may provide essential grasp-related information for specific tool actions.
- The SMG integrates online and learned information for planning the overall tool use action.
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