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Functional dissociation of multiple-object tracking mechanisms based on hemispheric asymmetries
Hendrik Lesch1, Mircea Ariel Schoenfeld1,2,3, Christian Merkel2
1Kliniken Schmieder, Heidelberg, Germany.
Restorative Neurology and Neuroscience
|December 16, 2020
Summary
Multiple object tracking involves serial and parallel mechanisms. This study shows right hemisphere damage impairs tracking single items, while left hemisphere damage affects object-based attention, linking brain function to tracking strategies.
Area of Science:
- Cognitive Neuroscience
- Neuropsychology
- Visual Perception
Background:
- Multiple theories explain tracking multiple objects, including serial processing (spatial locations) and parallel processing (abstract spatial configurations).
- These models propose different mechanisms for maintaining information about tracked items over time.
Purpose of the Study:
- To investigate the link between serial/parallel object tracking mechanisms and hemispheric specialization.
- To explore the roles of the right hemisphere in space-based attention and the left hemisphere in object-based attention during tracking.
Main Methods:
- Recorded electrophysiological brain responses in patients with right and left hemispheric lesions.
- Administered a multiple object tracking task to assess performance and neural correlates.
Main Results:
- Right hemispheric patients failed to distinguish single item information and lacked a specific electrophysiological marker.
- Left hemispheric patients exhibited graded behavioral and electrophysiological responses based on stimulus congruence.
Conclusions:
- Hemispheric specialization contributes to distinct tracking mechanisms (serial vs. parallel).
- The right hemisphere is crucial for single item tracking, while the left hemisphere supports object-based attentional processing.
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