Definition: Reflexes normally present in infancy. Pathological in adults.
Causes: dementia, frontal lobe lesions, interrupted communication with higher cortical centres.
Listed in order of increasing loss of inhibition.
Tapping between eyes repeatedly causes blinking with no attenuation of response.
Stroking palm causes patient to grip fingers.
Stoking cheek produces rooting response. Thought to represent a greater loss of normal inhibition than suckling reflex (Paulson, 1977)
Tap on closed lips provokes pouting.
Scratching thenar eminence causes contraction of mentalis on ipsilateral side.