Myerson's sign or glabellar tap sign is a clinical physical examination finding in which a patient is unable to resist blinking when tapped repetitively on the glabella, the area above the nose and between the eyebrows. It is often referred to as the glabellar reflex. It is often an early symptom of Parkinson's disease, but can also be seen in early dementia as well as other progressive neurologic illness. It is named for Abraham Myerson, an American neurologist.
- Conley, Scott; Kirchner, Jeffrey (15 July 1999). "Parkinson's disease--the shaking palsy Underlying factors, diagnostic considerations, and clinical course". Postgraduate Medicine. 106 (1). doi:10.3810/pgm.1999.07.604. PMID 10418573.
- Sunohara, N; Tomi, H; Satoyoshi, E; Tachibana, S (Oct 1985). "Glabella tap sign. Is it due to a lack of R2-habituation?". Journal of the Neurological Sciences. 70 (3): 257–67. PMID 4056821.
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