Alternative definition : NICHD: An involuntary response in the neonate to the feeling of falling or a loud
noise characterized by the infant's arms symmetrically spreading out to the side and
then back to the midline, and flexion of the fingers and toes, that disappears by
4-6 months of age.; CDISC: An involuntary, primal response in the neonate to loud noise or the feeling
of falling. The response is characterized by the infant's arms symmetrically spreading
out to the side and then back to the midline, and involuntarily flexing the fingers
and toes.;