Much of movement education works with the effects of the startle
response, mostly those associated with a sustained response.
Taking Moshe to the Movies deals with
it a bit. New Understanding of the Machinery of
Flinching talks about a new study that investigated the effects of
various drugs on the response, termed flinching in the article. The
startle response or flinch occurs in two phases, an initial surprise
response and then a more dramatic tightening. It is sustaining this
later part of the response that results in so much chronic tension and
sometimes damage. The guys doing the study found that they could damp
the effects of the second part, but not the first. The flinch response
is just buried too deeply in the instinctive machinery of the nervous
system to be effected. Probably a good thing.