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The lateralized flash-lag illusion: A psychophysical and pupillometry study.
Yuta Suzuki1, Sumeyya Atmaca2, Bruno Laeng3
1NTT Communication Science Laboratories, NTT Corporation, Kanagawa 243-0198, Japan.
Brain and Cognition
|February 3, 2023
Summary
The flash-lag illusion (FLI) is perceived differently in the left and right visual fields. This study found the FLI is larger in the left visual field, suggesting more efficient processing in that hemisphere.
Area of Science:
- Neuroscience
- Visual Perception
- Psychophysics
Background:
- The flash-lag illusion (FLI) demonstrates a perceived lag between a flashed object and a moving object.
- Previous research suggests potential hemispheric differences in visual processing.
Purpose of the Study:
- To investigate anisotropy of the FLI between the lateral visual fields.
- To compare psychophysical measures and pupillary responses in the left and right visual fields.
Main Methods:
- Psychophysical assessment of the FLI.
- Measurement of pupil dilation as an indicator of cognitive processing.
- Stimuli presented in the left and right visual hemifields.
Main Results:
- A significantly larger FLI was observed in the left visual field (LVF) compared to the right visual field (RVF).
- Pupil dilations were greater in the RVF than in the LVF.
- Pupil responses returned to baseline faster in the LVF.
Conclusions:
- Findings suggest greater efficiency in spatial and attentional processing, and motion extrapolation, in the LVF/right hemisphere compared to the RVF/left hemisphere.
- The observed FLI anisotropy supports hemispheric specialization in visual perception.
