Related Experiment Videos
The size-distance paradox is a cognitive phenomenon
M Mon-Williams1, J R Tresilian
1School of Psychology, University of St. Andrews, Fife, Scotland, UK.
Experimental Brain Research
|July 28, 1999
Summary
The size-distance paradox, suggesting perceived size influences distance perception, may not occur during action-based judgments. This challenges theories on how the brain combines visual information for perception.
Area of Science:
- Visual perception
- Cognitive neuroscience
- Psychophysics
Background:
- Perceived object size is linked to perceived distance.
- The size-distance paradox suggests perceived size influences distance perception.
- This challenges current models of sensory information integration in the brain.
Purpose of the Study:
- To investigate if the size-distance paradox is limited to conscious perceptual judgments.
- To test if action-based distance judgments eliminate the size-distance paradox.
- To re-evaluate the role of perceived size in distance perception.
Main Methods:
- Comparing verbal reports of distance with action-based pointing judgments.
- Participants judged target distance under conditions designed to elicit the size-distance paradox.
- Experimental manipulation of perceived object size and fixation distance.
Main Results:
- The size-distance paradox was observed in participants making verbal distance judgments.
- No paradoxical distance judgments were found in participants performing action-based pointing tasks.
- This indicates a dissociation between conscious and action-based distance perception.
Conclusions:
- The size-distance paradox is likely restricted to conscious perceptual judgments.
- The paradox should not be interpreted as evidence for perceived size influencing distance perception.
- This finding has implications for understanding multisensory integration and perceptual judgment.