We perceive and understand our environment using many sensory systems-vision, touch, hearing, taste, smell, and proprioception. These multiple sensory modalities not only give us complementary sources of information about the environment but also an understanding that is richer and more complex than one modality alone could achieve. As adults, we integrate the multiple signals from these sense organs into unified functional representations. However, the ease with which we accomplish this feat belies its computational complexity. Not only do the senses convey information about the environment...