During the first two stages of infancy, which correspond to the period before the child is able to reach for a visually perceived object, none of these criteria for a cognitive map is met. The permanence of perceived objects is best investigated by studying the child’s reaction to the disappearance of an object. During this period the child does not search for an object that is gone, nor does he anticipate where it might have gone. At best, he continues to feel or look at the place where it disappeared-i.e., he continues doing what he was doing at the time it disappeared. During this period, there is some integration of the senses. The child learns to look at an object that is making a noise; he can tie together tactual sensations from the hand, kinaesthetic sensations from limbs, and tactual sensations from the mouth. He can put what he touches into his mouth and suck it.