Abstract
In Part I the author shows that EEG can provide a measure of physiological activity as related to S, to R, and that activity is conditioned by a substratum which can be simultaneously sampled by other available techniques. Part II reviews the studies which used EEG as a technique. The electrical potentials and their properties are described, and the investigations are classified under interindividual and intra-individual variability. Under the former classification the relation of EEG to personality and intelligence as well as EEG constancy is discussed. Intraindividual variability includes a discussion of EEG as related to the stimulus, the response, and other physiological measures. 4 propositions are formulated in Part III as an outgrowth of the various findings that have appeared. Bibliography of 73 titles.