Abstract : The object of this research is to determine and define the interactions observable between man and numerical machines with sensory modality interfaces. It explores in depth the concepts of virtuality, multisensoriality, interactivity, etc...and makes explicit the interest -- even appetence -- towards new technologies (i.e. Information and Communication Technologies). The framework of this research is the study of collective representations based on analysis of tittles of the French daily " Le Monde " over a period of five years and surveys established on questionnaires and semi-guided interviews. It takes into account the aspect of sociality which is part of decision making in acquisition and practice of computers and networks. On this basis, a sampling has been made of seventeen individuals who are submitted to a systematic observation of an ethological type, according to a novel methodology, segmented into three phases : First, an interview which allows to approach, through the verbal medium, the various individual stands linked to ICT. Transcribed and analysed with the Alceste program for contextual analysis of speech, the obtained material permits, among other results, to determine the elaboration of four classes of users which must be differentiated from the recognized levels of competence and experience. This is followed by the filming of practices, commented at first by the subject in the presence of the researcher and then left to himself, which underscore the importance of sense modalities and proxemies as factors of specific behaviours. Those are then compared to behaviours observed among twenty-four young individuals (age 3 to 6). This multidisciplinary process emphasizes the interest of establishing connection between human sciences of information and communication, educationnal approaches and ethology, when the linking of social identifications, behavioural realizations and individual conducts is concerned.