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Bilateral field interactions and hemispheric asymmetry in number comparison
E Ratinckx1, M Brysbaert, B Reynvoet
1Department of Experimental Psychology, Ghent University, Henri Dunantlaan 2, B-9000 Ghent, Belgium. elie.ratinckx@rug.ac.be
Neuropsychologia
|February 13, 2001
Summary
This study explored how the brain processes number comparison using different formats. Findings suggest complex interhemispheric interactions rather than strong hemispheric asymmetry in number magnitude representation.
Area of Science:
- Cognitive Neuroscience
- Psychology
- Neuroscience
Background:
- Investigating hemispheric asymmetry in numerical cognition.
- Understanding bilateral field interactions in number comparison tasks.
Purpose of the Study:
- To examine hemispheric asymmetry and bilateral interactions in number comparison across different notations.
- To determine the influence of visual field presentation on number magnitude representation.
Main Methods:
- A numerical comparison task using Arabic numerals, word numerals, and bar graphs.
- Simultaneous presentation of target and distractor stimuli in opposite visual fields.
- Participants manually indicated target magnitude while ignoring distractors.
Main Results:
- Limited evidence for left visual field (LVF) advantage in Arabic numeral comparison, challenging strong laterality.
- Significant interactions between target and distractor values observed, indicating robust interhemispheric communication.
- Interactions occurred at both response and input stages, evidenced by a bilateral identity effect.
Conclusions:
- Number magnitude representation is not strongly lateralized.
- Interhemispheric interactions play a crucial role in number comparison, influencing both early sensory processing and later response selection.