Preliminaries to speech analysis: The distinctive features and their correlates. By Roman Jakobson, C. Gunnar M. Fant, and Morris Halle. (Technical report No. 13, 2d printing with additions and corrections.) Pp. viii, 58. Cambridge, Mass.: Acoustics Laboratory, Massachusetts Institute of Technology, 1952.

This report proposes some questions to be discussed by specialists working on various aspects of speech communication.These questions concern the ultimate discrete components of language, their specific structure, their inven- tory in the languages of the world, their identification on the acoustical and perceptual levels and their articulatory prerequisites.We regard the present list of distinctive features, and particularly their defi- nitions on different levels, as a provisional sketch which is open to discussion and which requires experimental verification and further elaboration.The nature of these problems calls for coordinated research by linguists, psycho- logists, experts in the physiology of speech and hearing, physicists, communications and electronics engineers, mathematicians, students in symbolic logic and semiotics, and neurologists dealing with language disturbances, as well as the investigators of the poetic use of speech sounds.I