French term (edited): aspontaneit� motrice

First of all, on the web there's only one occurrence of aspontaneité in French.
There are lots of English aspontaneity, but it's either verbal or behavioral.
On the other hand, there are also lots of French akinesie, with or without 'extrapyramidal'.
We all understand 'aspontaneité motrice' to mean *lack of spontaneous movement* (a possible reply to the question).
Here are some definitions for akinesia:
Stedman's: Absence or loss of the power of voluntary movement, due to an extrapyramidal disorder.
Dorlands: absence, poverty, or lack of control of voluntary muscle movements.
[http://www.abess.com/glossary.html#akinesia] A state of motor inhibition or reduced voluntary movement.
On Google, one will also find many occurrences of akinesia defined as "lack of spontaneous movement".
So I believe the French should be akinesie and the English akinesia. Otherwise, the safe bet, 'lack of spontaneous movement'.