06/03/2014 09:22 am ET Updated Jun 03, 2014

The Search For Psychology's Lost Boy: A Decades-Old Mystery Of 'Little Albert'

The baby on the floor next to the unsmiling woman. The burning newspaper just beyond the baby’s grasp. The tiny monkey on a leash, led by the man in the tie. The parade continues: scraggly dog, rat, rabbit. Through it all, the baby, plump and serene, gazes on with mild interest. No tears, no tantrums.

These words appear on the screen:

"Fear of an animal may be experimentally set up by stimulating the infant with a loud sound just at the moment the animal is presented. Six combined stimulations produced the marked fear of the rat shown next."

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