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Glabellar tap

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The glabellar tap is a primitive reflex where the eyes shut if an individual is tapped lightly between the eyebrows. This reflex may normally be overcome rapidly - i.e. the individual soon fails to blink, usually less than five taps.

In a patient with frontal release signs the reflex cannot be overcome, and they continue to blink for as long as the examiner cares to keep tapping. A similar response is seen with late parkinsonism.


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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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