A purely visual adaptation to motion can differentiate between perceptual timing and interval timing

Area of Science:

• Cognitive Neuroscience
• Visual Perception
• Psychophysics

Background:

• The brain's mechanisms for processing time information remain unclear, with debate on centralized vs. distributed systems.
• Visual adaptation has been a tool to study sub-second time perception (perceptual timing).

Purpose of the Study:

• To investigate if motion adaptation induces duration after-effects in supra-second time ranges (interval timing).
• To explore the role of visual motion adaptation in time perception across different scales.

Main Methods:

• Participants adapted to spatially localized drifting motion.
• Judged the relative duration of visual stimuli (600 ms and 1200 ms) after adaptation.
• Analyzed changes in perceived duration and discrimination thresholds.

Main Results:

• Motion adaptation significantly compressed the perceived duration of a 600 ms stimulus.
• A weaker compression effect was observed for a 1200 ms interval.
• Improved discrimination thresholds suggest the effect is not due to attention or increased noise.

Conclusions:

• Visual motion adaptation influences interval timing, extending beyond perceptual timing.
• A novel computational model explains duration perception and after-effects.
• Visual motion adaptation can serve as a tool to study time perception mechanisms across various scales.