I found this article very interesting on how babies can recognized faces better than other objects. tI is said that babies tend to stare at face like images even when their vision lags. They have done studies on infants to see how they can zero in on a face. The researchers use net of electroencephalograhic sensors that measures the electrical activity of participants brains. The sensors were monitoring what are called steady state visual potentials – spikes in brain activity elicited by visual stimulation. By flashing photographs at infants and adults and measuring their brain activity at the same steady rhythm.