Visuotactile temporal order judgments in ageing

Area of Science:

• Neuroscience
• Psychology
• Sensory Processing

Background:

• Crossmodal temporal perception integrates information from different senses.
• Ageing is known to affect cognitive functions, but its specific impact on crossmodal timing remains under investigation.
• Previous studies often confounded spatial and temporal cues in crossmodal perception.

Purpose of the Study:

• To investigate the effects of ageing on crossmodal temporal perception.
• To determine if ageing impacts the ability to judge the temporal order of visual and vibrotactile stimuli.
• To examine crossmodal temporal processing while controlling for spatial location effects.

Main Methods:

• Participants: Young (mean age 21.7) and old (mean age 75.1) adults.
• Task: Temporal Order Judgment (TOJ) of visual and vibrotactile stimuli presented to either hand.
• Procedure: Varied stimulus onset asynchrony (SOA) using the method of constant stimuli; measured temporal precision via just noticeable difference (JND).

Main Results:

• Temporal precision (lower JND) was better for stimuli from different positions (101 ms) versus the same position (120 ms).
• Older adults exhibited poorer temporal precision (larger JNDs, 131 ms) compared to younger adults (98 ms).
• Age-related deficits in crossmodal temporal processing were observed even when spatial confounds were eliminated.

Conclusions:

• Ageing significantly impairs crossmodal temporal perception.
• Reduced temporal precision in older adults suggests a decline in multisensory integration timing.
• This study provides evidence for age-related changes in crossmodal timing independent of spatial factors.