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Two hypotheses about primate cognition are proposed. First, it is proposed that primates, but not other mammals, understand categories of relations among external entities. In the physical domain primates have special skills in tasks such as oddity, transitivity, and relation matching that...
Human infants have considerable understanding of why objects move and what causes them to take one trajectory over another. Here, we explore the possibility that this capacity is shared with other nonhumans and present results from preferential looking time tests with a New World monkey, the...
Although chimpanzees generally grasp small objects imprecisely between the knuckle joint of the index finger and thumb, they are capable of a true precision grip, which resembles the human pincer grip. They also grip small objects between the index and middle finger. The development of these...
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