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Lynch discusses extensive work with dogs in with significant physiological variables are correlated with the animals' interactions with human beings—for example, major changes in the dog's blood pressure, aortic blood flow, and coronary blood flow. Similar emotional changes have been observed in such varied relationships as those of parents with their children and the doctor with his patient. The suggestion from a number of the animal studies is that at least part of the physiological response elicited from the dog by a human is learned. For example, petting the dog is a far more effective means of eliminating prior conditioned fear responses than simply having the person enter and leave without petting the dog. In his generalizing to the human interaction situation, the author draws on the work of Spitz who speaks of the need for a 'dialogue' between two living organisms. This important aspect of socialization and human development is then discussed in the light of certain technological changes that may impinge significantly on the process of human attachment. An example of this would be the use of such devices as teaching machines.