RHY.4:4 - Solution
RHY.4:4.1 - Choose the relation the performance needs
Name the reference and the contribution to be aligned with it. “The listener hears this accent with the click” differs from “the actuator contacts the surface when the command is due.” A partnered task may need a recognizable weight arrival that gives the other dancer time to respond.
State whether the target is coincidence, a lead, a lag or a bounded range. Obtain that target from the performance intention and actual interaction. Do not remove expressive displacement merely because a grid makes coincidence easy to display.
RHY.4:4.2 - Identify the relevant landmarks
Follow the action only as far as the question requires: command, movement, contact, sound or load change, and received cue. Choose the physical or response feature used to locate each relevant event.
For contact, the rule might be the first sustained contact visible in a suitable recording. For weight arrival, specify the mechanical or task criterion actually used; an audible footfall alone cannot provide it. For a perceived location, state whose judgement, which reference and which task supplies the estimate.
Treat an uncertain location as an interval or a spread of responses when appropriate. A threshold or detector identifies a feature under its rule; a large number of reported decimal places adds no warrant.
RHY.4:4.3 - Compare positions under compatible observations
Use a shared time reference when combining instrumented observations. Account for known recording or delivery delays if they could change the correction. If those delays are unknown and consequential, compare within a setup that cancels them or leave the physical delay unresolved.
For an auditory judgement, a listener may adjust a reference click relative to a repeated sound. A synchronization task instead asks someone to tap with the sound. These tasks answer related but different questions: the tapping result includes the performed response. Preserve the task used; do not label every response timestamp the sound’s P-center.
For movement, use a receiving task suited to the question. A partner can identify when a transfer becomes usable, or respond to it in an agreed simple continuation. That response helps judge the interaction. A claim about a general perceptual center in dance would require its own definition and evidence.
Begin with the available discrimination. If the receiving participant can already distinguish the usable variant from the unusable one, submillisecond instrumentation may add nothing to the rehearsal choice.
RHY.4:4.4 - Change the contribution that can improve the relation
Choose a controllable change: when preparation begins, when the action is triggered, the shape of the sound or pressure change, the cue used by the receiver, or the division of coordination work.
Hold other consequential conditions sufficiently stable to interpret the trial. A fixed timing shift is a candidate when the same cue has a repeatable offset under those conditions. If the shape, tempo, receiver or context changes, inspect the relation again rather than carrying the old offset forward automatically.
Check the result that motivated the correction. Earlier contact is useful only if it improves the intended timing or usable continuation. If the adjustment harms another contribution, retain the trade-off and compare another variant.
RHY.4:4.5 - Return the usable relation and its scope
The result states the chosen events, target relation, observation basis, correction if any, and conditions in which it worked or remains a proposal. Another performer should be able to tell what to attend to and what to change.
Use a numerical estimate only when it supports that action. Keep unresolved sensing delay, response variability or cue ambiguity separate from a finding of performer error. Broader transfer to other people, sounds or equipment requires its own basis.