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Should the goal of practice be to reduce movement variability to as low a value as possible? Is high variability the signature of an unskilled performer or a necessity for effective learning?
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Articles/links:
A schema theory of discrete motor skill learning
Feedback-Induced Variability and the Learning of Generalized Motor Programs
Optimizing generalized motor program and parameter learning
Variability in baseball pitching biomechanics among various levels of competition
What variability tells us about movement expertise
The bliss (not the problem) of motor abundance (not redundancy)
Timing an attacking forehand drive in table tennis
Regulation of gait in long jumping
Inter-individual variability in the upper–lower limb breaststroke coordination
Differing Roles of Functional Movement Variability as Experience Increases in Gymnastics
The education of attention as explanation of variability of practice effects: learning the final approach phase in a flight simulator

Figures

Figure showing three different patterns of movement that could would produce the same overall variability measure.

Figure from Seiffert et al. (2011) showing inter-subject variability in swim strokes

More information:
My Research Gate Page (pdfs of my articles)
My ASU Web page
Podcast Facebook page (videos, pics, etc)
Twitter: @Shakeywaits
Email: robgray@asu.edu

Credits:
The Flamin’ Groovies – Shake Some Action
Mr Airplane Man – Very Bad Feeling
Dazie Mae – The Very Opposite of My Husband
The New Mystickal Troubadours – The Fully-Blissed Out
Leather Uppers – I Don’t Like You Very Much
Mark Lanegan – Saint Louis Elegy