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Grasping at sticks: pseudoneglect for perception but not action
Laura E Hughes1, Tim C Bates, Anne Aimola Davies
1Macquarie Centre for Cognitive Science, Macquarie University, NSW 2109, Sydney, Australia. lhughes@maccs.mq.edu.au
Experimental Brain Research
|June 29, 2004
Summary
Visual cognition research shows perception for judgment and action may be separate. Bisection tasks revealed differing biases for lines versus rods, but actions showed no bias, supporting independent perception-action theories.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Visual Cognition
Background:
- A key debate in visual cognition concerns whether distinct cognitive processes support perceptual judgments versus perception for action.
- Bisection tasks are frequently employed to investigate dissociations between perception and action, particularly in brain-injured patients.
Purpose of the Study:
- To investigate the independence of perception for judgment and perception for action using bisection tasks in neurologically intact individuals.
- To examine potential differences in spatial biases between perceptual judgments and actions.
Main Methods:
- Forty neurologically intact participants performed a standard line bisection task.
- Participants also completed a rod bisection task, involving both perceptual judgments of the center and physical grasping actions to the center.
Main Results:
- A typical leftward bias was observed during the line bisection task.
- Perceptual judgments of the rod's center showed a distinct rightward bias.
- Actions of grasping the rod's center demonstrated no significant spatial bias.
Conclusions:
- The findings align with theories proposing independent systems for perception and action.
- While supporting dissociation, alternative explanations for the observed biases are acknowledged and warrant further consideration.