Physical development
1941–2004Movement emerges in the moment
Esther Thelen
What in the child, the task, or the room is making this pattern?
The person and the problem
A developmental psychologist who, with dynamical-systems colleagues, showed that infant stepping “disappears” and reappears with changes in body mass and context — movement is not a stored program waiting to run.
The deeper idea
A skill is assembled from the child, the task, and the environment, right now. Change one constraint and a different pattern can show up. Development is plastic. The same child “can’t catch” in a loud gym and can catch on the floor with a scarf.
Evidence and limits
Do not throw out teaching. Constraints invite a pattern; children still need a cue, a model, and a reason to stay. Hands-off is not mind-off.
Teaching application · 18 mo–10
Change one thing
Open the Constraints lab. Pick throwing or landing. Change the ball, the start, or the wall. Count three attempts before you talk.
What to observe
Did the pattern change when the room changed? If yes, stop blaming the body for the environment.
Also
Parents: a different ball is not “dumbing it down.” It is asking a clearer question of the nervous system.
Start with: Week 3, dynamical systems on Theories, Constraints lab.