Relationship between the client's adaptive verbalizations and the therapist's verbal behaviour in the clinic context

Today's clinical psychology advocates for empirically validated treatments. This supports the need for outcome-driven research, but may overlook the importance of process-driven research, which can respond to the question of why psychological treatments work. Functional analysis of behaviour has received a new boost with the emergence of the third wave of psychological therapies, which stress the importance of verbal behaviour in therapy as a way to access and modify client problems. The case presented in this work was analysed in order to make an approach to the strengthening processes that take place in therapy through verbal interaction. First, we developed and applied a categorization system of client's adaptive verbalizations. We found that this type of verbalizations increase significantly after the first few sessions, remain high in the middle sessions, and gradually decrease towards the end of the therapy. We subsequently developed and used a system of categorization of therapist's verbal behaviour. We found that agreeable verbalizations were concentrated in the middle sessions, being replaced by other verbalizations in the final sessions.