Studying infant speech perception is important and valuable to elucidate the process of language acquisition. In the past decades, there have been many studies on the perception of segmental features related to phonemic contrasts, as well as the perception of supra-segmental features related to the prosodic pattern of the utterances. For these studies, several types of methods have been developed to measure infant speech perception abilities, and researchers choose an appropriate method depending on the purpose of the study. In this paper, the behavioral measures that are most frequently used in infant speech-perception studies are reviewed. These procedures are the high-amplitude sucking procedure, the operant headturning procedure, and the headturn preference procedure.
