Busch, D. 1982. "Introversion-extroversion and the EFL proficiency of Japanese students". Language Learning 32: 109-132.
Trazo da personalidade que fai ao aprendiz pouco participativo na interacción social, opóñendose así ao aprendiz extravertido. Algunhas investigacións relacionan o grao de introversión e extraversión dos aprendices co éxito na aprendizaxe da segunda lingua; con todo, os resultados obtidos non son concluíntes.
Bibliografía:
Krashen, S. D. 1981. Second Language Acquisition and Second Language Learning. Oxford: Pergamon Press.
Naiman, N., Frölich, M., Stern, H. & Todesco, A. 1978. The Good Language Learner. Research in Education Series No. 7. Toronto: The Ontario Institute for Studies in Education.
Rossier, J. 1975. "Extroversion-introversion as a significant variable in the learning of English as a second language". University of Southern California. Dissertation Abstracts International 36: 7308ª-7309ª. (Tesis doctoral inédita).
Strong, M. 1983. "Social styles and second language acquisition of Spanish-speaking kinder-garteners". TESOL Quarterly 17: 241-258.