Where does stride collide?

In the study of human walking, a stride is one full gait cycle: the interval and distance from the moment one foot contacts the ground to the next contact of that same foot, which spans two successive steps. Wilhelm and Eduard Weber's Mechanik der menschlichen Gehwerkzeuge (1836) founded the quantitative measurement of walking and treated the stride as the repeating unit whose length and timing describe a gait; Inman, Ralston, and Todd's Human Walking (1981) later made the stride the standard cycle for clinical and biomechanical gait analysis. Here the referent is a measured movement of the body through space, counted in metres and seconds, and it has nothing to do with a piano technique or a step taken by a filter over an image.[1][2]

Unit

One gait cycle, measured as stride length in metres and stride time in seconds

Recovery means

Not applicable

Measured by

Recorded by motion capture, instrumented walkways, or force plates as stride length, stride time, and cadence

In jazz piano, stride names a left-hand style in which the hand alternates rapidly between a low bass note or octave on the strong beats and a mid-range chord on the offbeats, so the hand appears to stride back and forth across the keyboard while the right hand carries the melody. The pianist James P. Johnson developed the style in Harlem in the 1910s and 1920s, with pieces such as Carolina Shout (recorded 1921) becoming its models, as documented in Scott E. Brown's A Case of Mistaken Identity: The Life and Music of James P. Johnson (1986). Here the referent is a performance technique and musical style, described by its rhythmic pattern and hand motion, not a walking cycle or a parameter in a neural network.[3]

Unit

A left-hand accompaniment pattern, described by its bass-to-chord alternation per bar

Recovery means

Not applicable

Measured by

Identified in performance and notation by the alternating bass-and-chord figure and its tempo