Key evidence & numbers
| Example tap time minus cue time | Interpretation | Status |
|---|---|---|
| −20 ms | Tap occurs before cue | Illustrative value |
| 0 ms | Registered events coincide | Definition of zero asynchrony |
| +20 ms | Tap occurs after cue | Illustrative value |
These examples define the sign convention, not a normal range or diagnostic threshold. The synchronization reviews document the tendency for taps to lead auditory cues and evaluate multiple explanations. The effect is about predictive coordination, not a simple reaction-time contest. Repp, 2005 Repp et al., 2013
Why prediction matters
To remain aligned with a repeating beat, a person can prepare the next movement based on its expected time. Waiting to detect each beat and only then initiating movement would be a different response strategy. The reviews distinguish phase correction, period correction and the role of timing information, rather than attributing synchronization to one simple reflex. Repp, 2005
The mean offset and variability also differ. A person could have a small consistent lead or taps scattered widely around zero. Those are different patterns and should not be compressed into a single judgement that every negative value is bad. Repp et al., 2013
Does the tempo change the task?
Preferred tempo and the range of rates people can track vary across development. McAuley and colleagues' lifespan study and the spontaneous-tempo review show why a single metronome rate is not equally informative for every person. Unpaced natural tempo is also different from synchronising to a supplied rhythm. McAuley et al., 2006 Desbernats et al., 2023
What affects it?
Equipment can shift the measured offset
The software's scheduled cue time may differ from physical sound onset, and a tap timestamp may differ from actual contact. Online timing evaluations document system-dependent delays and variability. A small measured lead therefore includes uncertainty from the apparatus, especially when sound delivery and input registration follow different pathways. Anwyl-Irvine et al., 2020 Bridges et al., 2020
Repeating a task can estimate some variability but cannot automatically calibrate a fixed offset. Without direct physical timing validation, do not subtract a generic device delay or interpret a few milliseconds as a precise neural prediction. Anwyl-Irvine et al., 2020
Is early tapping the same as beat deafness?
No. A slight anticipatory offset in a synchronization task is different from the particular impairment described in the beat-deaf case. That research concerns a broader pattern assessed across tasks, not a universal cutoff based on whether the mean tap is before zero. Phillips-Silver et al., 2011
What can you realistically practise or compare?
Compare the same task, tempo, input method and audio setup, and keep offset and variability separate. Practice may change coordination in a task, but these reviews do not provide a guaranteed training dose or a rule that everyone should force mean asynchrony to exactly zero. Repp et al., 2013
Short-run reliability also matters before classifying an individual. The reliability-paradox work provides a general reason to verify the stability of a score rather than infer a fixed trait from a brief demonstration. Hedge et al., 2017
The useful conclusion is that anticipation is part of rhythmic coordination. Slightly early recorded taps require interpretation of the task and apparatus; they are not a diagnosis, a measure of all musical skill or evidence of superhuman response speed. Repp, 2005 Anwyl-Irvine et al., 2020
Try the related free test
Musical ear test
Try the rhythm section of the musical ear test to reproduce a heard pattern. It is a listen-and-repeat task rather than continuous metronome synchronization. Its score cannot be interpreted directly as the negative-asynchrony measure described here.
Common questions
Are negative values errors?
They indicate that the registered tap preceded the cue under this sign convention. A small mean lead is a known synchronization phenomenon, not automatically a deficit. Repp, 2005
Does an early tap show a negative reaction time?
It reflects anticipation of a predictable event, not a response initiated after detecting a new unpredictable cue. Repp et al., 2013
Can Bluetooth or a phone affect the offset?
Audio and input pathways can add timing offsets. The exact amount needs measurement for the setup; a generic correction is not justified. Anwyl-Irvine et al., 2020
Sources
- Repp (2005). Sensorimotor synchronization: A review of the tapping literature.
- Repp et al. (2013). Sensorimotor synchronization: A review of recent research (2006–2012).
- McAuley et al. (2006). The time of our lives: Life span development of timing and event tracking..
- Desbernats et al. (2023). Which factors modulate spontaneous motor tempo? A systematic review of the literature.
- Anwyl-Irvine et al. (2020). Realistic precision and accuracy of online experiment platforms, web browsers, and devices.
- Bridges et al. (2020). The timing mega-study: comparing a range of experiment generators, both lab-based and online.
- Phillips-Silver et al. (2011). Born to dance but beat deaf: A new form of congenital amusia.
- Hedge et al. (2017). The reliability paradox: Why robust cognitive tasks do not produce reliable individual differences.
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