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Oculomotor bias induced by number perception.
Martin H Fischer1, Nele Warlop, Robin L Hill
1Psychology Department, University of Dundee, Scotland. m.h.fischer@dundee.ac.uk
Experimental Psychology
|April 30, 2004
Summary
Eye movements reveal a spatial association with numbers. Participants responded faster to small digits on the left and large digits on the right, supporting the mental number line theory.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human-Computer Interaction
Background:
- Previous manual response studies suggest a link between numerical magnitude and spatial representation.
- The existence and nature of this number-space association in cognitive processes remain an active area of research.
Purpose of the Study:
- To investigate if eye movements, a more direct measure of cognitive processing, reflect the number-space association.
- To examine the relationship between digit parity, magnitude, and spatial response initiation using oculomotor measures.
Main Methods:
- Recorded eye movement responses from 15 healthy participants.
- Participants categorized digits 0-9 as odd or even.
- Analyzed response initiation times and movement amplitudes in relation to digit magnitude and parity.
Main Results:
- Response initiation was significantly faster to the left for smaller digits and to the right for larger digits.
- No systematic effect of number magnitude or parity on movement amplitudes was observed.
- Eye movement patterns provide evidence for the spatial orientation of numerical cognition.
Conclusions:
- The findings support the existence of a spatially oriented mental number line.
- Eye movements serve as a valid indicator of the number-space association, complementing manual response data.
- This research deepens our understanding of how numerical information is represented and processed in the brain.