PURPOSE: to analyze the maternal perception on the introduction and use of alternative and augmentative communication boards in cerebral palsy language clinic. METHODS: semi-structured interviews were conducted and used to created analysis categories based on three guiding aspects: a) the constitution of maternal function and its execution with individuals with cerebral palsy; b) dialogic interaction under Bakhtinian perspective; and c) the effects of language clinic on the maternal role and on the dialogue between mothers and their children. RESULTS: the results indicate different types of resource usage in the mother-child dyad, which are related to the quality of the maternal role and to the form of presenting the resource to users and their family. When the conception of language with which the resource is implemented does not include the family or consider the exercise of maternal role, the results in its generalization and maintenance are precarious. In cases where there was a debate on family use of the communication board, favoring the process of intersubjectivity between subjects without orality and their family, use and generalization were increased. CONCLUSIONS: it may be concluded that Bakhtin conception on dialogic language crossed by psychoanalysis allows for a more efficacious approach as for the probed communicative device.