Related Experiment Video
Updated: Oct 11, 2025
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Assessment of Audio-Tactile Sensory Substitution Training in Participants with Profound Deafness Using the Event-Related Potential Technique
Published on: September 7, 2022
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Reduced flash lag illusion in early deaf individuals
Maria Bianca Amadeo1, Alessia Tonelli1, Claudio Campus1
1U-VIP Unit for Visually Impaired People, Fondazione Istituto Italiano di Tecnologia, Via E. Melen 83, 16152 Genova, Italy.
Brain Research
|December 1, 2021
Summary
Early deafness reduces the flash-lag illusion (FLI), a motion-induced position shift. This suggests that lack of audition profoundly impacts early visual processing and spatial perception.
Area of Science:
- Neuroscience
- Visual Perception
- Auditory Neuroscience
Background:
- The flash-lag illusion (FLI) demonstrates a motion-induced position shift where a briefly flashed object appears to lag behind a moving stimulus.
- Auditory deprivation is associated with enhanced visual skills and altered temporal processing, factors potentially influencing FLI perception.
Purpose of the Study:
- To investigate the influence of early auditory deprivation on the flash-lag illusion.
- To explore potential correlations between central and peripheral visual field effects in deaf individuals.
Main Methods:
- A visual flash-lag illusion paradigm was employed.
- Participants included 13 early deaf individuals and 18 hearing individuals.
Main Results:
- A significant reduction in the flash-lag effect was observed in early deaf individuals compared to hearing individuals, across both central and peripheral visual fields.
- A positive correlation between central and peripheral FLI was found exclusively in the deaf group, indicating an expansion of underlying neural mechanisms.
Conclusions:
- Early auditory deprivation significantly modulates early visual processing, specifically reducing the flash-lag illusion.
- The findings suggest cross-modal plasticity where visual processing mechanisms adapt in response to the absence of audition.
