Fig. 6.

Eyelid motility determines trigeminal reflex blink excitability. The mean excitability of the subject with right facial nerve palsy divided by the mean excitability of age-matched control subjects for the 250 msec interstimulus interval is plotted as function of the mean blink amplitude of the palsied eyelid divided by the mean blink amplitude of the unaffected eyelid for each day tested. ●, Data from stimulation of the SO ipsilateral to the right facial nerve palsy (right SO). ○, Data from stimulation of the contralateral SO (left SO).