Unmasking Identity: Speaker Profiling for Forensic Linguistic Purposes

Abstract

ABSTRACTWhen an anonymous speech sample is associated with a criminal matter, for example in the case of a phoned-in bomb threat or ransom demand, forensic linguistic profiling may be used to infer attributes of the speaker from his or her linguistic characteristics. In this review, we present research and case examples outlining what types of speaker characteristics are discoverable via speaker profiling by expert linguists, for example, gender, age, and region of socialization. We also consider different methods in speaker profiling, including aural-perceptual, acoustic phonetic, and automated, and briefly discuss expert versus nonexpert speaker profiling, as well as the proper role of linguistic profilers versus law enforcement and legal professionals, government agencies, and others with whom forensic linguists work. Finally, we address the problem of voice and dialect disguise, including what types of disguises criminals may effect and what methods can be used to unmask them, including human and automated. We illustrate our points by alluding, throughout the review, to various elements of a case in which we recently served as expert linguistic profilers.