“…In derived conditioning, in contrast to respondent and operant conditioning, stimuli (objects, words, thoughts, etc.) receive their functions (e.g., fear) indirectly via and according to their specific relations to other stimuli [29]. Based on this approach, specific interventions in ACT aim to undermine problematic functions of cognitions and language, for example, by means of acceptance (i.e., noting experiences of, e.g., pain/distress, without attempting to change them) and perspective-taking exercises (i.e., placing yourself as an active observer of such thoughts/experiences), and to facilitate adaptive and flexible behavioral repertoires in line with motivating verbal antecedents (i.e., personal values) [30,31].…”