摘要
[Ilt may be that ... reason, self-consciousness and self-control which seem to sever human intellect so sharply from that of all other animals are really but secondary re- sults of the tremendous increase in the number, delicacy and complexity of associations which the human animal can form. It may be that the evolution of intellect has no breaks, that its progress is continuous from its first appearance to its present condition in adult ... human beings. If we could prove that what we call ideational life and reasoning were not new and unexplainable species of intellectual life but only the natural consequences of an increase in the number, delicacy, and complexity of associations of the general animal sort, we should have made out an evolution of mind comparable to the evolution of living forms. (p. 286). © 1996 Academic Press Inc.