When Briana touched her infant's cheek, he turned his head toward the side that was touched and opened his mouth. Briana was eliciting the rooting reflex.
One of the frontal release reflexes, or involuntary primitive motor reflexes, which are mediated by the brainstem is the rooting reflex. It starts when an infant's mouth corner is stimulated. The baby will turn his or her head toward the stimulus and open the mouth with a tongue thrust when the mouth is touched or stroked.
The frontal lobe of the cerebral cortex develops and suppresses the primitive motor reflexes between 4 and 6 months after birth (about 28 weeks gestation), at which point the rooting reflex is present. Primitive reflexes are replaced by voluntary motor processes as the frontal lobe develops. Each primal response has a different disappearance age.
Learn more about the rooting reflex with the help of the given link:
brainly.com/question/6919391
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