ACT therapy (Acceptance and Commitment Therapy) does not aim for symptom reduction as its primary goal. Its target is psychological flexibility, which is the ability of an individual to maintain or modify behavior based on what their values require, even in the presence of aversive internal experiences. This positioning clearly distinguishes it from traditional CBT protocols focused on cognitive restructuring.
Experiential avoidance and rigidity: the psychopathological model of ACT
ACT is based on its own psychopathological model. Clinical suffering does not directly arise from negative thoughts or emotions, but from experiential avoidance, which is the systematic tendency to flee, suppress, or control internal experiences deemed unpleasant. This process becomes pathological when it rigidifies and reduces the patient’s behavioral repertoire.
In practice, we observe that this psychological rigidity manifests in very different clinical presentations: generalized anxiety, depression, chronic pain, eating disorders, addictions. Therefore, ACT proposes a transdiagnostic model. Recent syntheses confirm its effectiveness on issues that cross DSM categories, such as burnout, perfectionism, or rumination.
It is precisely this functional reading (what is the patient avoiding, and at what cost?) that guides case formulation, rather than a checklist of symptoms. To delve deeper into ACT therapy in psychology, it is essential to understand that the intervention does not seek to change the content of thoughts, but the relationship the patient has with them.
Cognitive defusion and acceptance: two processes often confused in clinical practice
Cognitive defusion and acceptance are frequently presented as the same therapeutic gesture. In reality, they operate on distinct levels. Defusion targets language and the literalness of thoughts. It aims to reduce the regulatory function that the patient attributes to their internal verbalizations. A classic exercise involves repeating a word until it loses its emotional impact, thus revealing the arbitrary nature of the link between the word and the experience.
Acceptance, on the other hand, concerns emotions and bodily sensations. It invites the patient to make space for aversive experiences without attempting to modify them. It is neither resignation nor passive tolerance: it is an active posture of openness oriented towards action.
The confusion between these two processes sometimes leads to poorly calibrated interventions. A patient who fuses with the thought “I am worthless” needs defusion. A patient who avoids the sadness associated with a loss needs acceptance. Treating defusion when the problem is emotional avoidance delays therapeutic progress.
Values and committed actions: the engine of behavioral change in ACT
Clarifying personal values is the lever that distinguishes ACT from a simple mindfulness practice. In ACT, values are not achievable goals, but freely chosen life directions. They function as a horizon: one never reaches them, but gets closer through concrete actions.
Working on values helps identify why a patient would be willing to go through difficult experiences. Without this step, acceptance remains an abstract exercise. We recommend clarifying values early in the therapeutic process, as they serve as a compass for everything that follows.
- Values are distinct from goals: “being a present parent” is a value, “picking up my child from school three times a week” is a committed action aligned with that value
- Committed actions must be observable, specific, and achievable within a short timeframe to maintain the patient’s motivation
- The therapist regularly checks whether the committed actions reflect the patient’s values or those imposed by their surroundings, culture, or thoughts
A patient who acts according to their values tolerates psychological discomfort better, because this discomfort has meaning. This mechanism explains the effectiveness of ACT in chronic pain and progressive somatic illnesses: the pain does not disappear, but it ceases to govern the behavioral repertoire.
ACT and chronic pain: an underestimated clinical application
The application of ACT to chronic pain represents a rapidly expanding clinical field. The approach directly targets the struggle against pain, which often constitutes the main factor of disability, more than the pain itself. ACT does not promise to reduce pain, but to restore a functional life despite it.
Recent clinical publications position ACT as a preferred approach for progressive physical illnesses, precisely because it does not rely on the promise of symptomatic improvement. The patient learns to redirect their attention towards their values rather than the constant monitoring of their sensations.
This application illustrates the transdiagnostic scope of the model. Whether it is anxiety, depression, or chronic pain, the pathological process remains the same: experiential avoidance that restricts life. And the therapeutic process is the same: acceptance, defusion, commitment to values.
- In the context of chronic pain, defusion often focuses on catastrophic thoughts (“this pain will never stop”) rather than identity beliefs
- Contact with the present moment helps the patient distinguish the actual painful sensation from the anxious anticipation that amplifies it
- Committed actions are calibrated to the patient’s actual physical capacity, not to an ideal prior to the illness
ACT is also deployed in adapted formats, including teletherapy. Various clinical setups now integrate this remote approach, expanding access for patients with reduced mobility or those far from specialized centers.
The theoretical framework of ACT, relational frame theory, continues to fuel fundamental research on language and cognition. For the clinician, the concrete contribution remains the same: a functional reading grid that adapts to the patient, not to the diagnosis.