It has never before been possible to mimic human anxiety so thoroughly through the use of drugs alone. The biology of fear and anxiety. And so here we have the laboratory evidence for what ought to have been assumed all along. Nevertheless, one can expect to hear that until we can climb inside an animal's skull, we must not assume that that animal shares experiences with us. For each mammalian species, there exists a set of predetermined behaviors.
Behavioral science assumes that animal species behave in predictable ways.
After all, the aim of animal field studies is to determine the components of such patterns. Psychologist Jean Piaget nevertheless tells us that the concept of predetermined behavior is at odds with modern scientific thought. Every animal, from protozoan up to man, presents behavior patterns. In other words, while scientists cannot deny the fact of orderliness in behavior, many nonetheless deny that such orderliness has been predetermined, and instead look to passive experiences, i.e., to the theory of evolution, for the answer to why predictable behavioral patterns exist. The feared anthropomorphism to which Piaget refers is not the assertion that animals possess characteristics of man.