Enhanced auditory postauricular evoked responses after corticobulbar lesions.
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.
D000328:Adult; D000368:Aged; D002540:Cerebral Cortex / Q000503:physiopathology; D005072:Evoked Potentials, Auditory; D005155:Facial Nerve Diseases / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged; D009046:Motor Neurons; D009434:Neural Pathways; D009468:Neuromuscular Diseases / Q000503:physiopathology; D013116:Spinal Cord / Q000503:physiopathology