DISCUSSION: Dr. Victor Rosen disagreed that Freud's metapsychological theory parallels the clinical theory of sexuality. He also questioned Dr. Klein's implicit equation of 'sensual' and 'sexual'. He suggested that drive discharge theory more accurately describes the clinical connections of diverse observations than does clinical theory. Although he agreed with the separation of two essentially different theories, Dr. Leo Spiegel commented on the different ways he and Dr. Klein regarded the role of discharge and pleasure in drive reduction theory. Dr. Charles Fisher cited experimental neurophysiological evidence that demonstrates that peremptory drivelike behavior can be brought about independently of any evidence of activation of the drive in the physiological sense.