Fig 1.
Simple and complex auditory rhythms used in the perception and synchronization tasks.
Black and grey tones were sounded in the Perception condition. Black indicates sounded tones and grey indicates participants’ instructed taps that produced tones in the Synchronization task. Circles indicate stimulus beats on which asynchronies between sounded tones and produced taps were computed.
Fig 2.
Behavioral synchrony measures by rhythm condition in the synchronization task.
A): Mean absolute asynchrony by Rhythm condition (in ms). B): Mean signed asynchrony by Rhythm condition (in ms). C): Mean standard deviation of signed asynchrony by Rhythm condition (in ms). Circles = individual participants’ values.
Fig 3.
Mean recurrence rate (%) in the cardiac time series (beats per minute) by task (perception, synchronization) and rhythm (simple, complex).
Circles = individual data points.
Fig 4.
Sample cardiac time series (in beats per minute) and recurrence plots (in number of samples) from one participant for each auditory condition and rhythm condition.
A) Perception task: Simple rhythm (left) and Complex rhythm (right). B) Synchronization task: Simple rhythm (left) and Complex rhythm (right). Black dots in recurrence plots indicate points of recurring heartbeat intervals.
Fig 5.
A) Mean % Determinism in the cardiac time series (beats per minute) by Task. Circles = individual data points. B) Sample cardiac time series (in beats per minute) and recurrence plots (in number of samples) from one participant for each Auditory Condition with the Simple rhythm. Left) Perception task. Right) Synchronization task. Diagonal lines of black dots indicate determinism (predictability), sequential recurring heartbeat intervals in the cardiac time series.
Fig 6.
A) Mean Absolute Asynchrony and RMSSD, in ms, and B) Mean Standard Deviation of Signed Asynchrony and RMSSD, in ms.