The vocal tract is the area in the human body that is responsible for producing speech sounds. It includes the throat, mouth, and nasal passages. Research in the field of vocal tract examines how these structures work together to produce different sounds, how speech sounds are formed, and how variations in vocal tract shape and size affect speech production. This research area also explores how speech therapy and interventions can help individuals with speech disorders or difficulties in producing speech sounds. Overall, the study of the vocal tract is essential to understanding the mechanics of speech production and communication.