The Babinski Reflex, often classified with the Palmar Grasp, is an automatic response that healthy newborns have when the sole of their foot is stroked from toe towards heel. Their toes fan out and curl inwards. Often you'll see doctors testing this reflex in newborns. If a newborn has a good Babinski Reflex, it is generally a good indicator that they have a healthy nervous system.

See Babinski Sign. I'm not sure whether the author of that node and myself are talking about the same thing – but that writeup seems to be referring to a different phenomenon dealing with the same area of the nervous system.