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The effect of monocular viewing on heartbeat discrimination
1Department of Comparative Physiology, Eötvös Loránd University, Budapest, Hungary.
Psychophysiology
|July 1, 1994
Summary
Monocular vision creates hemispheric imbalance. Left-eye viewing, activating the right hemisphere, improved heartbeat discrimination compared to right-eye viewing, suggesting hemispheric lateralization in interoception.
Area of Science:
- Neuroscience
- Psychology
- Ophthalmology
Background:
- Monocular viewing conditions may induce an activational imbalance between cerebral hemispheres.
- This imbalance is hypothesized to depend on the viewing eye's laterality, influencing visual information processing.
- Morphological and physiological data suggest nasal optic fibers (contralateral hemisphere) receive more visual input.
Purpose of the Study:
- To investigate the effect of monocular viewing on cerebral hemispheric activation.
- To test the hypothesis that left-eye viewing enhances heartbeat discrimination due to right-hemispheric activation.
- To explore the relationship between hemispheric lateralization and interoceptive accuracy.
Main Methods:
- Thirty male, right-handed university students participated.
- Participants performed a Whitehead-type heartbeat discrimination task.
- Visual input was restricted to either the left or the right eye.
Main Results:
- Heartbeat perception accuracy was significantly better during left monocular viewing.
- Left-eye viewing, presumed to activate the right hemisphere, led to superior performance.
- Respiratory manipulation further enhanced heartbeat discrimination performance.
Conclusions:
- Monocular viewing induces lateralized hemispheric activation affecting interoception.
- Right-hemispheric dominance in heartbeat perception is supported by left-eye viewing advantage.
- Interoceptive accuracy can be modulated by visual input laterality and respiratory control.