Grasp Reflex
A primitive reflex characterized by involuntary gripping when the palm is stimulated, typically indicating frontal lobe dysfunction.
Full Definition
The grasp reflex, also known as the palmar grasp reflex, is a primitive reflex that normally disappears in infancy but may re-emerge following brain injury, particularly frontal lobe damage. When the palm or fingers are lightly stroked, the patient involuntarily grasps and holds onto the stimulus object, often with considerable strength. This reflex can significantly interfere with rehabilitation activities and functional hand use. The presence of a grasp reflex in adults indicates disinhibition of primitive reflexes due to loss of cortical control. In severe cases, the reflex may be so strong that patients cannot release objects voluntarily, requiring specific therapeutic techniques to reduce its impact on functional activities.
Usage
Usage note: Document strength and bilateral presence; impacts therapy planning significantly.
In Context
- "The patient exhibited a strong grasp reflex bilaterally, significantly impacting her ability to release utensils during feeding tasks." — Occupational therapy evaluation
- "Presence of grasp reflex indicated frontal lobe involvement and required modified handling techniques during therapy sessions." — Physical therapy progress note