Good for Joseph Campos (who looks like a stroke survivor, by the way) for not over-hyping his research findings. However, the fact that 76% of babies will override their sensory perceptions ("You are going to fall!") based on social referencing (their mother's happy face) and 0% of babies will cross the abyss if the mother shows a "fear face" also significantly buttresses the concept of attachment. What's more important to a baby's survival: Depth perception or mother love?
See also: Lexicon of Madness: Visual Cliff