Several of the primitive reflexes, such as corneomandibular, palmomental, and the glabella tap sign are common in parkinsonism. The glabella tap sign is particularly characteristic, and may change during the course of the therapy with L-dopa. The glabellar reflex is less likely to reverse under L-dopa when other primitive reflexes are associated with it.
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Klawans et al. (2007) studied this question.