When Does Glabellar Reflex Disappear?

Normally, the glabellar reflex habituates after 2–4 taps. Sustained glabellar reflex was observed in 10% of normal volunteers ages 65–69 years and in 37% of those aged 80 years and older (Jenkyn et al., 1985). In PD, this reflex may persist and in rare cases it may produce blepharospasm.

Is glabellar reflex normal?

The glabellar reflex is a primitive reflex - normally present in infants and absent in adults.

What is the glabellar reflex?

Definition. A type of primitive reflex that is elicited by repetitive tapping on the forehead. Normal subjects usually blink in response to the first several taps, but if blinking persists, the response is abnormal and considered to be a sign of frontal release.