Abstract

Aristotle’s restriction of intellect to humans raised the problem of how animals are able to react to and learn from their environment if they lack the ability to recognize classes of objects, an ability supposedly conferred by intellect. Aristotle’s delineation of the internal senses into the common sense, imagination, and memory did not include a locus for the cleverness or prudence that he found animals to possess in varying degrees. Avicenna supplemented Aristotle’s internal senses by adding the estimative power, which allowed animals to recognize the value of a perceived object in terms of its potential benefit or harm. Albert the Great, who showed more interest than most medieval philosophers in the problem of animal behavior, adopted the estimative power and began his inquiry by considering pygmies, which he judged to be the highest form of animal. This inquiry led Albert to weaken but in the end to retain the distinction based on intellectual abilities between animals and humans.