The proceedings of the fourth colloquium of the Groupe de recherche en didartique des langues (Language Teaching Research Group) include eleven papers and four synopses. The papers, three in English (E) and the rest in French (F), cover these topics: cognitive presence in language teaching/learning (F); interlanguage and metalanguage (F); interrelations between cognitive and affective dimensions in language learning (F); cerebral mechanisms and learning processes (F); neurolinguistic evidence on cognitive processes in language learning and teaching (E); the role of cognitive styles and manual preference in foreign language learning (E); cognitive development and the bilingual child (F); cognition and language: toward a dynamic conception of language (F); parameters in the acquisition of foreign languages (F); cognitive processes in learning the target language's phonological system (F); and the moment of reference to the known in the making of a new utterance (F). The synopses include summaries of pedagogical, metalinguistic, and neurolinguistic perspectives of the conference, and a summary of the conference in general. (MSE)