Wikis > Glossary > Tactus

An isochronous pulse to which people will tap their finger or foot most naturally when listening to a piece of music. The mode for observed durations of the tactus is close to 600 ms (or 100 beats per minute), strikingly similar to the estimated value of the indifference interval.

Parncutt (1994) uses this 600-ms tactus as the center of a bell curve that is used to determine how salient any given pulse train in a sound sequence is. Similarly, Todd & Lee (1994) propose that 600 ms is the center frequency for a sensory-motor filter that takes as its input the output of the low-pass filters used to detect grouping.


One thought on “Tactus

  1. What is the “beats per minute” (bpm) equivalent to an inter-interval onset of 600 ms?

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