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for orbicularis oris superior, depressor anguli
oris (upper lip depressors), and orbicularis
oris inferior (lower lip elevator)...
Intersubject variabdity
The data presented reflect the compensa-
tory patterns for a group of five subjects...
However, Folkins and Zimmer-
mann (18) delivered most perturbations im-
mediately prior to or during the lower lip
movement...
In this vein, the present obser-
vations do not merely reflect changes in the
excitab'fiity of the motoneuron pool, as shown
previously (7, 25, 29, 33)...
The responsiveness of the perioral system
throughout the muscle action and movement
sequence also suggests that in normal cir-
cumstances the motor program parameters
may be specified only generally...
Using long-duration stimulus trains
that encompass the entire reaction and
movement times, movement times were
changed without concomitant changes in re-
action times...
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