Liaison psychiatry consists of an activity of consultation for patients affected by somatic diseases and of an activity of liaison for clinicians. The liaison work can take different forms, such as teaching of patient-physician relationship, supervision or support. To illustrate psychiatric liaison research, we present four studies conducted in our service, which explore (a) the relations between medical students' mental health and their interpersonal competence, (b) the dreams of medical students and what they reveal of their subjectivities, (c) the stakes for primary care practitioners when asking for a specialist's consult, and (d) the situated clinical practice. These studies contribute to nourish psychiatric liaison, which can use their results for training or support of clinicians.