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Sex differences and functional hemispheric asymmetries during number comparison
TiAnni Harris1, Andrea Scheuringer1, Belinda Pletzer2,3
1Department of Psychology, Paris-Lodron University Salzburg, Hellbrunnerstrasse 34, A-5020, Salzburg, Austria.
Biology of Sex Differences
|January 10, 2018
Summary
The unit-decade compatibility effect in number comparison is stronger in the right visual field and in women, suggesting hemispheric differences in processing number magnitudes. Menstrual cycle phase did not influence this effect.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human Perception
Background:
- Numbers possess hierarchical structures, similar to global-local stimuli.
- The unit-decade compatibility effect in two-digit number comparison suggests decomposed number processing.
- This effect challenges holistic models and aligns with global-local processing principles.
Purpose of the Study:
- To investigate if visual hemifield, sex, and menstrual cycle phase influence the unit-decade compatibility effect.
- To explore hemispheric asymmetries in number magnitude processing.
- To compare number processing with global-local hierarchical stimulus processing.
Main Methods:
- 160 participants (77 women, 83 men) performed a two-digit number comparison task.
- Stimuli were presented in the right or left visual hemifield.
- Women's sessions were timed to early follicular or mid-luteal cycle phases.
Main Results:
- A stronger compatibility effect was observed in the right visual hemifield compared to the left.
- Women exhibited a stronger compatibility effect than men.
- No significant effect of menstrual cycle phase on the compatibility effect was found.
Conclusions:
- Hemispheric asymmetries in number processing (holistic vs. decomposed) were demonstrated for the first time.
- Number magnitude processing shows similar hemispheric modulation as global-local processing.
- These findings highlight the role of visual hemifield and sex in number comparison.
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