Compensation for subliminal timing perturbations in perceptual-motor synchronization

Area of Science:

• Cognitive Neuroscience
• Psychology
• Motor Control

Background:

• Psychophysical limits of temporal discrimination are often assumed to constrain action timing.
• Perceptual-motor synchronization tasks investigate the relationship between perception and action timing.

Purpose of the Study:

• To challenge the assumption that temporal discrimination limits constrain action timing.
• To investigate the source of timing information used in perceptual-motor synchronization.
• To determine if automatic processes in action control utilize more accurate timing information than conscious judgment.

Main Methods:

• Five perceptual-motor synchronization experiments were conducted.
• Experiments involved auditory sequences with subliminal local changes in interval duration.
• Tasks included synchronized finger tapping, temporal order judgment, and detection tasks.

Main Results:

• Synchronized tapping rapidly compensated for subliminal changes in auditory interval duration.
• Compensation occurred even when changes were below the temporal order threshold.
• Factors affecting deviation detectability did not inhibit compensation.
• Compensation for timing perturbations did not rely on explicit detection.

Conclusions:

• Automatic processes for action timing have access to more accurate information than conscious auditory judgment.
• The limits of temporal discrimination do not constrain the timing information available for action control.
• Perceptual-motor synchronization relies on timing information not accessible to conscious awareness.