We have shown that human adults have individual perceptual signatures: the way in which you perceive ambiguous visual stimuli, which is fairly stable in each individual but very different from one person to the next. You can measure some of your own perceptual signatures here (it takes one minute):
Where do these signatures come from? Why does one person have a given signature, and another person a different one? One way of approaching this question is by studying young infants. Do they already have stable, individual signatures? If so, then we can ask another question: we know that certain signatures are more common in adults than others. Is this already the case in young infants? You may wonder how we get babies to make perceptual decisions such as the ones in the above demos. It turns out that we don't have to! By measuring their eye movements, we can guess what they are perceiving.