Peripheral Facial Palsy is a frequent condition in outpatient neurological consultation. To correlate its clinical and neurophysiological features with outcome, we prospectively studied 32 patients (19 women and 13 men) with Bell's palsy who were evaluated between the 5th and 15th day of disease onset. Age ranged between 16 and 71 years (mean 35.5 years). Electrical stimulation of the facial nerve was practiced and the evoked response was picked up from frontalis, orbicularis oris, orbicularis oculis and nasalis, comparing latencies and amplitudes with the unaffected side. Bipolar needle electromygraphy of the same muscles but nasalis, was also practiced. Muscle response to electrical stimulus was the most valuable parameter which correlated significatively with electromyography and good prognosis at six weeks (p<0.03). The amplitude, but not latencies delay of the direct response elicited by stimulation of the facial nerve, was also of value in determining prognosis.