The real hallmark of symbolic reasoning is the ability to compare and manipulate symbols. On this ground, we have evidence that chimpanzees are capable of symbolic logic. Chimpanzees can be trained to use linguistic symbols to ask for certain items, and two similarly trained chimps can conduct simple conversations with one another on the basis of these symbols.
Andere behaupten, dass solches Verhalten auch bei Menschen zu beobachten wäre. Das ist allerdings eine umstrittene These und bedarf der Verifizierung.
