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Enhanced auditory postauricular evoked responses after corticobulbar lesions

Neurology and Medical Research Services, Veterans Administration Medical Center, and Department nf Neurology, University of Florida, Gainesville. FL.

The auditory postauricular response is an evoked "microreflex" that is generated in the posterior auricular muscle. This potential, which has two prominent components at latencies of 12 and 16 msec, is best recorded with neck extensor or facial muscles under tension, but it is not recorded if scalp muscles are relaxed. We describe markedly enlarged postauricular responses after upper motor neuron lesions above the foramen magnum.

Address correspondence and reprint requests to Dr. Hammond. Neurology Service (127). Veterans Administration Medical Center. Gainesville. FL 32602.

Supported by the Medical Research Service of the Veterans Administration.

Presented in part at the thirty-third annual meeting of the American Academy of Neurology. Toronto, Canada, April 1981, and at the thirty-sixth annual meeting, Boston, MA, April 1984.

Accepted for publication June 6, 1984