AP PSYCHOLOGY

Detailed explanation-1: -The palmar grasp reflex is elicited by placing an object or the examiner’s finger in the palm of the infant’s hand; this leads to an involuntary flexion response. This reflex subsides by 3 to 6 months of age and is replaced by voluntary grasping, which is necessary to allow transfer of objects from hand to hand.

Detailed explanation-2: -The palmar grasp reflex is a primitive, prehensile, involuntary response to a mechanical stimulus present in a newborn. It appears around 16 weeks of gestation and can be elicited in preterm infants as young as 25 weeks of postconceptional age.[1][2][3]

Detailed explanation-3: -The palmar grasp reflex is present at 28 weeks of gestation and becomes more forceful at 32–37 weeks. It becomes less apparent and then disappears after approximately 2 months of age, when voluntary grasping becomes apparent.

Detailed explanation-4: -Palmar grasp reflex (or grasp reflex) is a primitive and involuntary reflex found in infants of humans and most primates. When an object, such as an adult finger, is placed in an infant’s palm, the infant’s fingers reflexively grasp the object.