Since 1968, according to the French higher education law, elected students must participate in the different academic boards in every university. As trustees, they must formulate opinions about the institutional policy. Moreover, they must deliberate on equal terms with teachers. According to a common discourse, this democratic activity is still considered as a nonsense because of some students structural weaknesses: very low turnout at the elections of their representatives, very high absenteeism rate of these miselected representatives and incapacity to formulate responsible and pragmatic proposals. This students uselessness in the academic participatory governance process would come from a post-modernist air du temps: youth apathy, individualism, democratic societies crisis... In accordance with the scientific questioning about the contemporary processes of political communication, I propose an alternative set of explanations focused on the spirit and practices which rule French academic boards. I assume that the development and improvement of student participation are also limited by endogenous factors that are closely linked with the functioning of the academic boards. I propose an ethnographic analysis of a French university board. I compare the elected students absenteeism to the others members (teachers, staff members and guests) attendance rates. Then I study the cultural patterns which structure the interactions. Discursive freedom would be the sine qua non condition of academic autonomy and the structural explanation of weak student participation by teachers.