In earlier studies with rats, the effectiveness of the auditory element of a tone--light discriminative stimulus was enhanced when the conditioned incentive value of the compound was negative rather than positive. The present experiment systematically replicated these results in pigeons trained to press a treadle in the presence of a tone--light…

The greater part of this paper is dedicated to a non-technical discussion and criticism of the principles of Skinnerian behaviorism. Various aspects of the theory are examined, and its inability to deal with verbal behavior as a productive and creative activity is asserted. The author's point of view is that expressed by Noam Chomsky in his…

Describes recent research findings in the area of neurobiology and its relationship to learning and memory. The article provides definitions of associative and nonassociative learning, identifies essential memory trace circuits of the mammalian brain, and discusses some neural mechanisms of learning. (TW)