Flexible tapping synchronization in macaques: dynamic switching of timing strategies within rhythmic sequences

Area of Science:

• Neuroscience
• Comparative Psychology
• Behavioral Biology

Background:

• Human musicality and dance rely on synchronizing movements to auditory rhythms.
• This rhythmic synchronization ability is rare in nonhuman species, though some primates show predictive synchronization to visual cues.

Purpose of the Study:

• To investigate macaques' ability to synchronize tapping movements to a visual metronome across a wide range of tempos.
• To characterize the precision and accuracy of their rhythmic timing.
• To determine if macaques use prior knowledge or error correction strategies for synchronization.

Main Methods:

• Macaques were trained on a visual synchronization tapping task with isochronous metronomes.
• Synchronization accuracy and precision were assessed across diverse tempos.
• An inference model analyzed timing control strategies, identifying distinct behavioral phases.

Main Results:

• Trained macaques exhibited high precision and accuracy in synchronizing to visual rhythms across various tempos.
• An inference model revealed a dynamic shift in timing strategies: initial reliance on prior interval statistics, transitioning to error correction.
• This switch occurred as macaques approached their preferred tempo, indicating adaptive timing control.

Conclusions:

• Primates possess sophisticated rhythmic timing mechanisms, capable of adapting to task demands.
• Macaques effectively utilize both internal priors and external cues for precise rhythmic synchronization.
• The findings provide compelling evidence for advanced temporal processing in nonhuman primates.