Transfer of learned perception of sensorimotor simultaneity

Area of Science:

• Neuroscience
• Cognitive Science
• Human Motor Control

Background:

• Motor responses to sensory stimuli typically exhibit a slight asynchrony, with the response preceding the stimulus.
• This sensorimotor asynchrony is influenced by feedback mechanisms, including visual, auditory, and somesthetic pathways.

Purpose of the Study:

• To investigate whether perceived simultaneity in one sensorimotor task can be altered by manipulating perceived simultaneity in a different, unrelated task.
• To determine if learning effects from a feedback-dependent task transfer to a task without explicit feedback.

Main Methods:

• Participants performed a key-pressing task synchronized with a visual stimulus (pacing task) with either immediate or progressively delayed feedback.
• Following the pacing task, participants performed a coincidence-anticipation task (line crossing) without feedback.
• Sensorimotor asynchrony was measured in both tasks to assess the impact of the pacing task's feedback manipulation.

Main Results:

• Asynchrony in the pacing task remained unchanged with immediate feedback but significantly increased with delayed feedback.
• Asynchrony in the subsequent line-crossing task also significantly increased, despite the absence of feedback in this task.
• Participants were unaware of the changes in their sensorimotor asynchrony.

Conclusions:

• Perception of simultaneity in sensorimotor tasks is not fixed but can be learned and adapted through experience.
• Learned adjustments in timing, potentially related to internal signal processing, can transfer across different sensorimotor tasks.
• This suggests that the brain's timing mechanisms are more adaptable than previously assumed, influenced by acquired experience rather than solely physiological latencies.