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Published on: October 27, 2016
Different effects of numerical magnitude on visual and proprioceptive reference frames
Elvio Blini1, Zaira Cattaneo, Giuseppe Vallar
1Department of Psychology, University of Milano-Bicocca Milano, Italy ; Department of Developmental Psychology and Socialization, University of Padova Padova, Italy.
Numerical magnitude influences spatial perception, affecting visual straight ahead tasks and rod bisection. This suggests the mental number line impacts egocentric frames of reference during active spatial exploration.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Spatial Cognition
Background:
- The relationship between numerical magnitude and spatial representation is a key area in cognitive science.
- Previous research suggests a link between number processing and spatial frames of reference.
Purpose of the Study:
- To investigate if numerical magnitude (small vs. large numbers) affects the setting of spatial coordinates, specifically the subjective straight ahead.
- To determine if auditory numerical stimulation influences egocentric spatial tasks.
Main Methods:
- 24 healthy participants completed four tasks: proprioceptive, visuo-proprioceptive, visual straight ahead, and rod bisection.
- Tasks were performed under passive auditory stimulation: numerical (small/large numbers) or neutral verbal ('blah').
- The visual task involved judging the straight ahead position of a moving light; rod bisection involved judging rod lengths.
Main Results:
- Numerical magnitude significantly modulated deviations in the visual straight ahead task (left-to-right movement) and the rod bisection task.
- Small numbers induced leftward deviations, while large numbers induced rightward deviations.
- No significant effects of numerical magnitude were observed in proprioceptive or visuo-proprioceptive tasks.
Conclusions:
- Auditory numerical magnitude influences spatial representations within an egocentric frame of reference.
- These effects are specific to tasks requiring active exploration of horizontal space, not passive proprioceptive judgments.
- The findings support the extension of mental number line activation to egocentric spatial processing under specific conditions.
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