When caregivers deal with acute stressful adverse events, cognitive overload and negative emotions can impair cognitive abilities and decrease clinical performance. The beneficial effect of positive communication on patients' emotions has widely been studied. However, the emotional and cognitive impact of positive communication between caregivers remains uninvestigated. The primary purpose of this trial is to study the impact of positive communication between anaesthetic teams during medical transmissions on clinical performance for managing a subsequent stressful unexpected adverse event. Secondary outcomes are to study the impact of positive communication on physiological (heart rate variability) and psychological (psychometric scales) levels of stress.