Da capo: the same score, played again

This is the sixth and last paper of a series on task-required motor events. It isan essay rather than a study: every measurement it uses was made in the first fivepapers, and nothing new was recorded. The argument is a change of reading. A task is a score — turning points ranked bypersistence, ordered by arc length, recurring across cycles — and a person is aperformance of it. Five plates carry the reading: two kinds of score (walkingcloses into a ring; sit-to-stand is a chain with no closure), one score playedthree ways, six players each keeping their own place, a room of 131 healthy and 47stroke subjects, and two rooms side by side. One result is new here. Healthy players are much alike; stroke players are not(S = +0.114 against a chance level of +0.030, and +0.079 against +0.019 once eachcycle's common shift is removed). Each person still repeats their own offset,though the recordings are too short to estimate that for individual strokesubjects, and the figure says so on the sheet. Nothing here is a device, a classifier or a clinical instrument. There is nodiagnosis, no severity grading and no functional claim; the figures are arrangedfor the eye, and every number printed in them is a transcription of a frozenartefact.