Originally published in 1978, this book is a collection of chapters based on the papers read at a conference in 1976 at Dalhousie University in Halifax, Nova Scotia. The title starts with an introductory essay in which a metatheoretical and philosophical approach to the problem of cognition in animals is discussed. The succeeding chapters are arranged, topically, from basic associative processes to higher mental operations. Problems derived from models of association are discussed; as well as work on attention, memory, and the processing of stimulus information; other deal with time, spatial, and serial organization of behaviour, and concept formation.