Decoupling · Atlas

1. Introduction

Version followed: the "Free from BFRB" self-help manual, Version 1.4 (26 Oct 2021; Moritz, Penney, Weidinger & Schmotz, University Medical Center Hamburg-Eppendorf), which contains decoupling (DC), decoupling in sensu (DC-is) and self-help habit reversal. DC-is follows the revised protocol of Moritz, Rufer & Schmotz (2020). The original 2011 movement-decoupling papers (Moritz & Rufer 2011; Moritz, Treszl & Rufer 2011) are not drawn on directly; their procedure is taken from the authors' later descriptions [uncertain where noted].

Decoupling is a brief self-help technique for body-focused repetitive behaviours (BFRBs): hair pulling (trichotillomania), nail biting, skin picking, and lip or cheek biting. It was developed in Hamburg in 2010 by Steffen Moritz and Michael Rufer and is delivered as a free downloadable manual with photographs. No practitioner training is required. The authors describe it as a variant of habit reversal training (HRT). In HRT the competing response is static (for example, clenching the fists). In decoupling it is dynamic: the person starts the usual approach movement toward the target, then sharply redirects it just before contact. [source: UKE decoupling page; Moritz, Penney & Schmotz 2023 BCP case report; Moritz, Hoyer & Schmotz 2023 CTR]

Theory of change: the habit is an automatic motor chain. Rehearsing the opening of that chain, then deliberately deflecting it, does two things. It reroutes the chain toward a harmless ending, and the deflection creates an irritation that brings the normally unnoticed behaviour into awareness, so the person can intervene. The authors say the behaviour is redirected rather than suppressed and that repeated practice serves to "unlearn" it. In DC-is only the final phase is imagined, so the full routine is not rehearsed, which the authors presume helps generalisation. [source: Moritz et al. 2021 Behav Modif; Moritz, Rufer & Schmotz 2020; Moritz, Hoyer & Schmotz 2023]

2. Framework

Decoupling is a single technique delivered as self-help, not a multi-phase therapy. The authors give a sequence of steps rather than formal phases. In the trials participants used the manual alone for about 4 weeks. The phases below are the manual's sequence; the session plan for clinicians is [synthesis]. [source: Free from BFRB manual v1.4; Moritz et al. 2021 Behav Modif]

Phase A: Understanding and observation (a few days).

Goal: the person learns the manual's "perfect storm" model of BFRBs (sensory, behavioural and psychological factors interacting) and records when, where, in what activity and in what mood the behaviour occurs. They do not try to change anything yet.
They may ask people close to them to point out episodes.
Move on when the person can name their typical motor pattern (which hand, which approach path, which target) and their high-risk times and situations. [source: manual v1.4 pp. 3–4; Moritz et al. 2021]

Phase B: Choosing the technique and movement patterns.

Goal: pick DC, DC-is, or the manual's habit-reversal response, and design no more than two decoupling movements matched to the person's own approach sequence.
In the trials, DC worked less well for skin picking, so DC-is or another technique may be preferred for pickers [source: Moritz et al. 2021 Behav Modif]. Choosing the technique by profile is [synthesis].
Move on when the person can perform the chosen movement correctly: same start, deflection shortly before the target, with speed and tension. [source: manual v1.4 pp. 6–7]

Phase C: Daily scheduled practice (about 4 weeks in trials).

DC: 10 repetitions in a row, at least three times a day, prompted by phone alarms, ideally at times shown in the log, and not in public.
DC-is: 5 repetitions, several times a day; the manual's per-session duration is ambiguous [uncertain; see DC-is below].
Practice happens in both symptom-free and symptomatic periods. This differs from HRT, which is used only when the urge or behaviour occurs. [source: manual v1.4; Moritz, Penney & Schmotz 2023 BCP; Moritz, Hoyer & Schmotz 2023]

Phase D: Application in critical situations.

Goal: use the deflection when the urge arises or the hand starts moving. In the tic case, the best results came when practice was timed to the premonitory urge. [source: Moritz, Penney & Schmotz 2023 BCP]

Phase E: Review and maintenance.

The manual sets no fixed review point. It says daily, consistent use will most likely show an effect and that new behaviours need time to take hold.
Practice continues even after clear improvement. Slips are not relapse.
If there is no progress despite consistent practice, the manual recommends considering psychotherapy. [source: manual v1.4 pp. 8–9]
Reviewing at about 4 weeks, matching the trial period, is [synthesis].

Clinician-supported format [synthesis]. The authors have not published a therapist-delivered protocol. A practical embedding:

Session 1: psychoeducation, hand out the manual, assign the observation log.
Session 2: review the log, design and rehearse one or two movements in session, set alarms.
Sessions 3–4, one to two weeks apart: check the movement, troubleshoot, add DC-is or switch technique if needed.
About week 4–6: review and plan maintenance.

In the tic case, the first author taught the technique in person, which shows that direct coaching is compatible with the method. [source: Moritz, Penney & Schmotz 2023 BCP]

3. Guiding principles

[source: manual v1.4; Moritz et al. 2021 Behav Modif; Moritz, Rufer & Schmotz 2020; Moritz, Hoyer & Schmotz 2023; Moritz, Penney & Schmotz 2023, unless tagged]

Redirect, don't suppress. Coach a movement that goes somewhere else, not a freeze or a struggle against the urge.
Start like the habit. The opening of the movement must copy the person's real approach path and hand shape, so build it from their own pattern, not a generic one.
Deflect late. The turn comes just before contact with the hair, nail, skin or mouth, not halfway.
Deflect with speed and tension. The redirection is accelerated and forceful; a finger snap at the end can help. A limp, slow turn misses the point.
End harmlessly, then return to neutral. The hand finishes at a safe spot (earlobe, back of neck, pushed away) and then rests.
Observe before intervening. A few days of neutral logging come first; the log also tells you when to practise.
Few patterns. Start with no more than two movements.
Practise when well, too. Rehearse in symptom-free periods as well as in risk situations; it is training, not only a response to urges.
Dose and reminders. Practise daily, at least three sessions, prompted by alarms; consistency matters more than intensity.
Private practice. Do not rehearse in public.
Imagery for generalisation. If the person has several routines or the overt version does not transfer, imagine only the final approach and do the physical deflection (DC-is).
Slips are data, not relapse, but no licence. Treat an occasional slip as part of learning, but do not consciously permit the behaviour.
Supports must not become avoidance. Gloves, plasters, caps and similar aids are fine, but check whether each one helps or just helps the person avoid.
Low threshold, stepped care. This is self-help; if consistent practice brings no progress, offer psychotherapy. Attend to the low mood and low self-esteem that often co-occur.
Tailor, don't script [synthesis]. The manual's examples are templates; the clinician's job is to fit the movement to the individual's motor chain and target site.

4. Intervention inventory

The primary manual contains these components: psychoeducation, observation log, decoupling with variants, decoupling in sensu, self-help habit reversal, alarm-based practice, and general tips including handling slips. Items 4.13 and 4.15 come from later case reports. The UKE site also offers a separate habit-replacement manual (Moritz et al. 2023 JAMA Dermatology); it is not covered here [uncertain]. All example language is illustrative unless quoted.

4.1 Psychoeducation: the "perfect storm" model

Purpose / when: First contact. Reduces shame, shows that BFRBs are common and treatable, and explains why a motor technique makes sense. [source: manual v1.4 pp. 2–3]
Steps:
1. Name the person's behaviour as a BFRB and list the family (hair pulling, nail biting, lip and mouth biting, skin picking).
2. Explain the model in your own words: sensory pulls (texture, tension, bumps), behavioural automaticity (the hand moves without decision), and psychological states (boredom, stress, tension) combine.
3. Acknowledge consequences: shame, hiding, social avoidance.
4. Explain that the technique targets the automatic motor chain: catch it early and send it elsewhere.
5. Give the manual and explain that it is self-help with your support [synthesis].
Example language (illustrative): "Most of the time your hand gets there before 'you' do. We're not going to fight the urge head-on. We're going to retrain where the hand goes."
Watch for: Shame or minimising. Signs it is working: the person can describe their behaviour as a habit with triggers rather than a character flaw.

4.2 Neutral observation and self-monitoring log

Purpose / when: Before any technique, for a few days. Identifies triggers, high-prevalence times and the exact motor pattern. Also provides the practice schedule and later the outcome baseline. [source: manual v1.4 pp. 3–4; Moritz et al. 2021; Moritz, Hoyer & Schmotz 2023]
Steps:
1. Give a simple log with columns for place/time, activity, feeling, and what the behaviour was.
2. Instruct the person to observe neutrally and not intervene yet.
3. Optionally enlist a trusted person to flag episodes.
4. In session, review the log for clusters (such as screen work, driving, reading in bed, evening fatigue) and for the motor sequence: which hand, what path, which finger shape, which target, what happens before contact (scanning or touching the area).
Example language (illustrative): "For the next few days, be a curious scientist, not a judge. Don't try to stop. Just note where, when, what you were doing and how you felt."
Watch for: Logs that are empty because the behaviour is unnoticed. Use informant feedback and ask about end-of-day evidence such as hair on the floor or damaged nails [synthesis]. Working: the person can predict their next high-risk situation.

4.3 Mapping the motor sequence and selecting movement patterns

Purpose / when: After the log, before practice. Builds the person's personal decoupling movement(s), at most two to start. [source: manual v1.4 pp. 6–7]
Steps:
1. Ask the person to demonstrate their usual approach in slow motion, stopping short of the target. The demonstration in session is [synthesis]; the manual has the person do this alone.
2. Name the phases: start position, lift, approach, pre-contact (fingers shaping for a pinch or bite), contact.
3. Pick a deflection point just before contact.
4. Pick a harmless endpoint: another body part (earlobe, ear, neck, nose) or pushing the hand away into space.
5. Choose the one or two most frequent routines (for example, the right hand to the crown while reading).
Example language (illustrative): "Show me how your hand usually travels, slowly, and freeze just before you'd touch. That's the spot where we'll turn it."
Watch for: An endpoint that is itself damaging or likely to become a new habit, such as hard tugging on the earlobe. Choose a light touch or a push-away instead [synthesis]. Working: the person can produce the movement smoothly without looking at the manual.

4.4 Movement decoupling: core procedure (DC)

Purpose / when: The core technique for hand-to-target BFRBs. Trial data suggest it suits non-pickers best. Practised on schedule in good and bad periods. [source: manual v1.4 pp. 6–7; Moritz et al. 2021 Behav Modif; Moritz, Hoyer & Schmotz 2023]
Steps:
1. Start the movement toward the mouth or head exactly as you usually would.
2. Shortly before contact, redirect it to another body part or push it away.
3. Make the redirection with acceleration and tension. A finger snap at the end can help.
4. Return the hands to a neutral resting position.
5. Repeat: 10 times in a row, at least three times a day, ideally at the high-risk times from the log, cued by phone alarms, and not in public.
Description from the authors: the person "jerks the hand away in a different direction with acceleration and tension" (Moritz, Hoyer & Schmotz 2023).
Example language (illustrative): "Same start as always, then right before you touch, whip it away, fast and firm. Snap. Hands back down. That's one. Nine more."
Watch for: Slow or limp deflections, or deflecting too early so the start no longer matches the habit. Skipped sessions: completion was lowest for DC in the three-arm trial. Working: more noticed approaches in daily life ("I caught my hand halfway"), fewer completed episodes, and the deflection starting to happen spontaneously [synthesis for the last point].

4.5 DC variant: nail biting

Purpose / when: Fingers-to-mouth routines. [source: manual v1.4; Moritz, Hoyer & Schmotz 2023; Moritz in The Star 2026]
Steps:
1. Raise the hand toward the mouth as usual.
2. Just before the fingertips reach the lips, deflect them to the earlobe or ear, or push the hand away with tension.
3. Snap the fingers, then lower the hands to neutral.
Example language (illustrative): "Hand up like you're going to bite, and at the last moment, over to your earlobe instead. Quick. Then rest."
Watch for: The earlobe touch becoming a fidget. Keep it light and brief [synthesis].

4.6 DC variant: hair pulling (trichotillomania)

Purpose / when: Hand-to-scalp, brow or lash routines. [source: manual v1.4; Moritz & Rufer 2011 as described by the authors]
Steps:
1. Move the hand toward the pulling site as usual, with the same fingers and approach.
2. Just before the fingers reach the hair, deflect to the back of the neck and massage it, or flick the hand forward and away.
3. Return to neutral.
A secondary self-help site also lists a sudden stretch above the head or tugging the ear as endpoints [source: TrichStop; secondary].
Example language (illustrative): "Your hand goes up toward your crown, and right before your fingers find a hair, slide it back to your neck and give it a squeeze."
Watch for: Pullers who select hairs by touch first (stroking or searching). The deflection may need to come before the searching phase, not just before the pull [synthesis]. Working: fewer pulling episodes, and earlier awareness when the hand rises.

4.7 Alternative ending: light nail brushing

Purpose / when: For nail biters who are driven by the tactile feel of the nail edge. Offers a harmless sensory ending. [source: manual v1.4 p. 7, Figure 7]
Steps:
1. Instead of biting, lightly brush the nails across the soft part of the other palm or the thumb.
2. Hold the nail at roughly a right angle and apply no pressure.
3. This can be combined with the deflection away from the mouth.
Example language (illustrative): "If what you're really after is the feel of the edge, let it brush lightly over your palm, no pressure, then let go."
Watch for: Pressing hard or scraping, which turns it into damage. If edges are rough, file them rather than bite (the manual's tip).

4.8 DC variant: mouth-based behaviours (lip and cheek biting)

Purpose / when: Cavitadaxia and other mouth-only routines with no hand involved. [source: Moritz et al. 2021 Behav Modif]
What the source says: for these, the redirection involves part of the mouth. No specific movements are given in the sources [uncertain].
Steps (derived) [synthesis]:
1. From the log, identify the starting cue (for example, the tongue finding a rough spot, or the jaw shifting).
2. Begin the jaw or tongue movement.
3. Just before the teeth close on the tissue, redirect: open the jaw, or move the tongue sharply to the palate or another neutral spot.
4. Relax the mouth.
Example language (illustrative): "As soon as your teeth start to line up on your cheek, swing your jaw open and press your tongue up. Then let your face go soft."
Watch for: Mouth guards should come through a dentist, per the manual. Refer to a dentist if there are lesions [synthesis].

4.9 Decoupling in sensu (DC-is; revised decoupling protocol)

Purpose / when: An imagery-plus-movement variant. The approach exists only in imagination; the physical deflection is real. Use it:
- for skin picking, where overt DC did less well;
- when there are several routines;
- when overt DC feels awkward or does not generalise;
- when the person cannot practise overt movements privately.
In the three-arm trial it had the best completion and was rated favourably by participants. [source: Moritz, Rufer & Schmotz 2020; Moritz et al. 2021 Behav Modif; manual v1.4 pp. 8–11]
Steps:
1. Sit comfortably and close the eyes.
2. Imagine the characteristic approach toward the face or head, such as the hand nearing the mouth with the teeth about to bite skin by a nail. Stop the image just before the act.
3. At that moment, physically and quickly push the hand away: clench a fist, thrust the arm forward or downward, and spread the fingers wide.
4. Relax.
5. Repeat about 5 times in a row, several times a day.
Dose: In the published case the patient practised twice daily on most days of the week. The manual's per-session wording, as extracted, says at least three minutes per session; a secondary site says 2–3 minutes [uncertain].
Description from the authors: the revised protocol "combines behavioral elements with imagery" (Moritz, Rufer & Schmotz 2020).
Example language (illustrative): "Eyes closed. See your thumb coming up, feel the edge under your teeth, almost there. Now: fist, push it away, fingers wide. Breathe out."
Watch for:
- Weak imagery. Have the person describe the scene aloud the first time in session [synthesis].
- Ending the imagined sequence after contact, which rehearses the act. The image must stop before contact.
- Working: fewer episodes, and the counter-movement starting to appear when real urges arise. In the published case, picking and biting stopped almost immediately, with one slip after 3 days.

4.10 Alarm-cued scheduled practice

Purpose / when: Ensures daily dose and links practice to risk periods. Use throughout Phase C. [source: manual v1.4 pp. 12–13; Moritz, Hoyer & Schmotz 2023; Moritz, Penney & Schmotz 2023]
Steps:
1. Set at least three daily phone alarms, placed at or just before high-risk times from the log.
2. At each alarm, do one block (DC: 10 repetitions; DC-is: about 5).
3. Tick a practice record [synthesis].
4. Practise even when no urge is present.
Example language (illustrative): "Let's put the alarms where your log says trouble starts: 10:30 at your desk, 4 pm, and 9 pm on the sofa."
Watch for: Alarms dismissed without practice. Working: at least about 80% of blocks done [synthesis threshold].

4.11 In-situation use at the urge or early movement

Purpose / when: Transfers training to real episodes, at the moment of urge or when the hand begins its approach. [source: Moritz et al. 2021; Moritz, Hoyer & Schmotz 2023; Moritz, Penney & Schmotz 2023]
Steps:
1. When the urge or the start of the movement is noticed, run the practised deflection once or a few times.
2. If you are in public, use a discreet form: a smaller movement, or the manual's habit-reversal hold [synthesis].
3. Return the hands to neutral or to a hands-busy activity.
Example language (illustrative): "The moment you feel your hand lifting, finish it the new way, the way you've drilled it."
Watch for: Using it only after the behaviour has already happened. In that case, add awareness cues for earlier links in the chain [synthesis]. Working: episodes stop at the approach stage.

4.12 Self-help habit reversal (static competing response; alternative in the same manual)

Purpose / when: The manual's alternative to decoupling. It suits people who prefer an unobtrusive response, or who need something usable in public. Optional; not part of decoupling proper. [source: manual v1.4 pp. 4–5; Moritz et al. 2021]
Steps:
1. Notice the urge or the behaviour.
2. Switch at once to a fixed, incompatible, inconspicuous posture: fists clenched, sitting on the hands, hands clasped, or tongue pressed to the palate.
3. Hold it for 1–3 minutes.
4. Practise especially in the logged risk situations, with alarms.
Example language (illustrative): "Urge comes, fists close, and you hold for a minute or two while the wave passes."
Watch for: In the tic case, static tensing increased later tics; decoupling was used instead. The self-help version lacks components of full clinician HRT. [source: Moritz, Penney & Schmotz 2023; Moritz, Hoyer & Schmotz 2023]

4.13 Supportive measures and the avoidance check

Purpose / when: Practical aids that reduce opportunity and harm while practice builds. [source: manual v1.4 pp. 12–13; Moritz in The Star 2026]
Steps:
1. Keep the hands busy.
2. Use behaviour-specific aids:
  - plasters or gloves over picking or biting sites;
  - caps for pullers;
  - mouth guards, obtained via a dentist;
  - avoiding mirror checking;
  - keeping nails short and carrying a nail file, so broken nails are filed, not bitten;
  - bitter pharmacy nail products.
3. Do not pop pimples or pull grey or split hairs.
4. For each aid, ask whether it helps or is just avoidance, and drop those that are avoidance.
Example language (illustrative): "Gloves while you watch TV: fine for now. But let's check in two weeks whether they're a bridge or a crutch."
Watch for: Aids replacing practice entirely, or growing social avoidance.

4.14 Handling slips and maintenance

Purpose / when: After early gains, and at any slip. [source: manual v1.4 pp. 8–9]
Steps:
1. Frame an occasional slip as normal and not a relapse.
2. Do not consciously allow the behaviour (no "just this once").
3. Review what preceded the slip in the log and add a practice block at that time [synthesis].
4. Keep practising after improvement, because new habits need time to take hold.
5. If there is no progress despite consistent practice, refer for psychotherapy.
Example language (illustrative): "One bite on Thursday doesn't erase three good weeks. What was happening just before?"
Watch for: All-or-nothing thinking after a slip, and dropping practice once symptoms fall.

4.15 Adaptation to tics (experimental)

Purpose / when: Single-case adaptation for Tourette syndrome. Use only as an experimental, clinician-taught add-on. [source: Moritz, Penney & Schmotz 2023 BCP]
Steps:
1. Identify the tic and its premonitory urge.
2. Design a hand or finger movement that resembles the tic and deviates just before the tic would occur. In the case, for an eyelid tic, the index finger was flexed and bent forcefully back toward the back of the hand.
3. Practise 2–3 times daily with a phone timer, at first at many points in the day.
4. Later, practise mainly at the premonitory urge.
Example language (illustrative): "When you feel that pressure behind your eye, let your finger do the movement instead, sharp and strong."
Watch for: In the case it helped eye tics but not other tics. The authors speculated this was because eye tics had a weaker premonitory urge [uncertain]. The adapted appendix is not drawn on [uncertain].

5. Handling problems

The primary sources say little about troubleshooting. They note low completion and lower subjective credibility for DC, poorer response in skin picking, slips, residual symptoms, and the referral route. Everything tagged [synthesis] is my own clinical guidance. [source: Moritz et al. 2021 Behav Modif; Moritz, Hoyer & Schmotz 2023; manual v1.4]

Non-adherence (the most likely problem with DC). In the head-to-head trial, completion for DC was the lowest of three self-help techniques and participants rated it as less effective than the alternatives, even though objective improvement was good. [source: Moritz et al. 2021]
- Shrink the dose to a reliable minimum: one alarm and 10 repetitions [synthesis].
- Attach practice to an existing routine [synthesis].
- Review the practice record each contact [synthesis].
- Offer DC-is, which had better completion [source: Moritz et al. 2021].
"It feels silly" / low credibility.
- Explain the rationale (redirect, not suppress; the irritation creates awareness) [source: Moritz, Hoyer & Schmotz 2023].
- Rehearse it with the person in session so it stops being strange [synthesis].
- Remind them that practice is private by design [source: manual v1.4].
Stuck: practice done, no change after about 4 weeks [synthesis on timing].
- Check fidelity: does the start really match their habit, is the deflection late and fast, is it practised at risk times?
- Check that log-based targeting was done.
- Then switch: DC to DC-is, or to the manual's habit-reversal hold, or to the group's habit-replacement manual.
- The manual's own route is referral for psychotherapy [source: manual v1.4]. Full clinician-delivered HRT or comprehensive behavioural treatment is a logical next step [synthesis].
Skin picking. DC was less effective for pickers [source: Moritz et al. 2021]. Prefer DC-is, which was developed in a picking and nail-biting case [source: Moritz, Rufer & Schmotz 2020]. Add barrier measures and mirror limits [source: manual v1.4]. Refer to a dermatologist for infected or scarring lesions [synthesis].
Generalisation failure: it works in drills but not in real episodes [synthesis].
- Move practice blocks into the actual risk contexts (desk, car, bed).
- Use DC-is, which is not tied to one routine [source: Moritz, Hoyer & Schmotz 2023].
- Add awareness of earlier links in the chain, such as touching or searching.
Unaware or "automatic" episodes. Use informant feedback [source: manual v1.4]. Also try wearable cues, such as a bracelet on the habit hand, and gloves at high-risk times [synthesis].
Focused, urge-driven, or emotionally driven episodes [synthesis]. Decoupling targets the motor chain, not the emotion. Add emotion-regulation or stimulus-control work. Low mood and low self-esteem commonly co-occur; the manual suggests addressing them, for example with the authors' free COGITO app [source: manual v1.4]. Screen for depression.
Substitution: the new movement becomes a habit, or other fidgeting persists. The published case still fidgeted with his hands after recovery [source: Moritz, Rufer & Schmotz 2020]. Keep endpoints light and non-damaging, rotate harmless endpoints, and do not treat fidgeting as failure [synthesis].
Overwhelm or shame after a slip. Normalise occasional slips but do not permit the behaviour deliberately [source: manual v1.4]. Do a brief chain analysis of the slip and add one targeted practice block [synthesis].
Public situations. Do not practise overtly in public [source: manual v1.4]. Use a scaled-down deflection, DC-is held only in the mind with a small fist-and-release under the table, or the static habit-reversal hold [synthesis].
Mouth-only behaviours. The sources give no specific movement [uncertain]. Use the derived jaw or tongue redirection (4.8) and a dentist-provided guard [synthesis plus manual v1.4].
Tics: competing responses make things worse. In the tic case, static tensing increased tics and decoupling helped eye tics only. Treat this as experimental and refer to a tic-specialist service using comprehensive behavioural intervention for tics as standard care [source: Moritz, Penney & Schmotz 2023; referral is synthesis].
Ruptures (when clinician-supported) [synthesis]. These usually come from the client feeling that "a hand trick" trivialises their suffering, or from shame about failing homework.
- Validate the burden.
- Present the technique as one tool within a broader plan.
- Collaboratively reduce demands.
- Never shame missed practice.
Children and adolescents [uncertain]. The trials recruited adults through online self-help forums. If adapting for young people, involve parents in prompting and praise, and simplify to one movement [synthesis].
Medical red flags [synthesis]. Signs of eating swallowed hair (trichophagia: abdominal pain, nausea), infected wounds, or severe tissue damage need medical referral. Self-harm with intent to injure is not a BFRB and needs standard risk assessment.
Conflicting descriptions [uncertain]. One secondary summary of the 2011 nail-biting trial describes a timed fist clench and release. That is inconsistent with every primary description of decoupling (a dynamic deflection of the approach movement) and is not followed here.

Sources

Sources:

Further reading (not drawn on) [uncertain]:

Moritz, S., & Rufer, M. (2011). Movement decoupling: a self-help intervention for the treatment of trichotillomania. Journal of Behavior Therapy and Experimental Psychiatry, 42, 74–80.
Moritz, S., Treszl, A., & Rufer, M. (2011). A randomized controlled trial of a novel self-help technique for impulse control disorders: a study on nail-biting. Behavior Modification, 35, 468–485.
Weidt, S., et al. (2015). Internet-based self-help for trichotillomania: a randomized controlled study comparing decoupling and progressive muscle relaxation. Psychotherapy and Psychosomatics, 84, 359–367.
Moritz, S., Penney, D., Missmann, F., Weidinger, S., & Schmotz, S. (2023). Self-help habit replacement in individuals with BFRBs. JAMA Dermatology.

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