Intertap interval dependence of the subdivision effect in auditory-synchronised tapping

Area of Science:

• Cognitive neuroscience
• Auditory perception
• Motor control

Background:

• Precise temporal synchronisation between action and perception is vital for daily activities.
• Subdivision benefit describes enhanced tapping synchronisation accuracy in 1:n tapping compared to 1:1 tapping.
• Existing hypotheses propose interval underestimation or strong beat perception as explanations for the subdivision benefit.

Purpose of the Study:

• To investigate the underlying mechanism of the subdivision benefit in temporal synchronisation.
• To determine if the subdivision benefit is dependent on beat strength.
• To examine the influence of musical experience on the subdivision benefit.

Main Methods:

• A 1:3 tapping task with three-tone patterns was compared to a 1:1 tapping task with single tone repetitions.
• Inter-tap intervals (ITIs) of varying lengths were used.
• Variability of tapping and tap timing were measured to assess synchronisation precision.
• The effect of musical experience was analysed.

Main Results:

• The subdivision benefit was observed for inter-tap intervals of 900 ms or longer, irrespective of beat strength.
• Musicians demonstrated a greater subdivision benefit than non-musicians.
• Tap timing generally did not shorten with subdivision, except for an ITI of 900 ms.

Conclusions:

• The subdivision benefit arises from the additional temporal reference provided by subdivided tones, supporting the hypothesis that it is independent of beat strength.
• The benefit is contingent on the inter-tap interval length.
• Musical training enhances the subdivision benefit, suggesting a role for auditory-motor processing expertise.