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From what to where: neuropsychological evidence for implicit interactions between object- and space- based attention
Glyn W Humphreys1, M Jane Riddoch
1Behavioural Brain Sciences Centre, School of Psychology, University of Birmingham, Birmingham, United Kingdom. g.w.humphreys@bham.ac.uk
Psychological Science
|August 22, 2003
Summary
This study on nonspatial extinction in a patient with parietal damage reveals that object-based attention implicitly guides spatial attention, even when location judgments are impaired.
Area of Science:
- Cognitive Neuroscience
- Neuropsychology
- Visual Perception
Background:
- Nonspatial extinction is a phenomenon where attention is biased towards more complex stimuli.
- Bilateral parietal damage can lead to deficits in spatial and nonspatial attention.
Observation:
- A patient (G.K.) with bilateral parietal damage exhibited nonspatial extinction.
- G.K. showed impaired detection of weaker perceptual groups, even when they were more complex.
- Object-based attention influenced G.K.'s report of stimuli at specific locations.
Findings:
- Nonspatial extinction was demonstrated, showing a bias towards stronger perceptual groups regardless of complexity.
- Spatial attention was implicitly drawn to the location of the dominant object, irrespective of explicit location awareness.
- A coupling between object-based and space-based attention was evident, where object competition determined spatial cueing.
Implications:
- The findings suggest that object-based attentional selection implicitly guides spatial attention.
- This implicit guidance operates even when explicit spatial judgments are compromised.
- Understanding this coupling offers insights into attentional mechanisms following parietal lobe injury.