A robust cerebral asymmetry in the infant brain: The rightward superior temporal sulcus

► We found four asymmetries in perisylvian regions of infant brains. ► A little known deeper right superior temporal sulcus (STS). ► A forward and upward shift of the posterior end of the right Sylvian fissure. ► An elongated left planum temporale and a larger left Heschl's gyrus. ► STS asymmetry should be studied as a genetic target for evolutionary pressure.