 According to Spelke (1988), the content of those representations appealed to in explaining the infant’s responses in tasks as those mentioned above is conceptual content. The manifest behavior reflects the infant’s incipient object concept and its capacity to utilize this concept in a primitive form of physical reasoning. However, if one has an account of what it is to possess a concept that makes it inappropriate to attribute mastery of the corresponding concept to the creature whose behavior is being explained, then the appeal to representations in the explanation of its behavior is also motivation for the notion of nonconceptual representational content.