Reduced audiovisual recalibration in the elderly.

Area of Science:

• Neuroscience
• Sensory Perception
• Human Aging

Background:

• Perceived synchrony between visual and auditory signals is crucial for multisensory integration.
• Adaptation to audiovisual temporal offsets recalibrates perception, essential for accurate stimulus interpretation across distances.
• While healthy aging broadens synchrony perception, its effect on audiovisual recalibration remains unclear.

Purpose of the Study:

• To investigate the impact of aging on audiovisual recalibration.
• To compare the adaptation of audiovisual synchrony perception in younger and older adults.

Main Methods:

• Participants (younger and older adults) adapted to synchronous or asynchronous audiovisual stimuli (sound-lag of 230 ms).
• Audiovisual synchrony perception was measured using the method-of-constant-stimuli before and after adaptation.
• Adaptation effect quantified by the shift in psychometric functions.

Main Results:

• Both age groups showed a reduced perception of sound-lag stimuli as asynchronous after adaptation.
• Older adults exhibited a significantly smaller adaptation effect compared to younger adults.
• No adaptation effect was observed for sound-lead stimuli in either group.

Conclusions:

• Audiovisual synchrony perception adapts less effectively in older adults.
• Aging may impair the recalibration mechanisms involved in multisensory integration.
• These findings highlight age-related changes in the brain's ability to adjust sensory processing.