Mirror Therapy After Stroke: How It Works, the Evidence and the Dose

Mirror therapy is a rehabilitation technique that uses a mirror to reflect your good limb into the position of your weak one, so the brain ‘sees’ the affected side moving, and it is a positively recommended adjunct after stroke with a small-to-moderate benefit for movement. It is added to your usual physiotherapy and occupational therapy rather than replacing them, and a common protocol is about 30 minutes a day, 5 days a week, for around 4 weeks¹².

The first time a therapist set up the mirror box in front of me, I thought it was a bit of a gimmick. My right hand had barely moved in weeks, and here was someone asking me to stare at a reflection of my left. Then I flexed the good hand, watched the reflection where my dead one should be, and felt something I can only describe as my brain flinching, as if it had been reminded of a thing it used to know. That is the honest sell of mirror therapy: modest, strange, and worth doing. This sits inside the wider picture of neuro-rehabilitation, and it works because of how neuroplasticity drives recovery.

What is mirror therapy?

Mirror therapy places a mirror vertically between your two arms so the reflection of the unaffected hand appears exactly where the affected hand is hidden, giving your brain the visual impression that the weak side is moving normally. You move the good hand, watch its reflection, and try to move the hidden weak hand at the same time; the trick is the visual feedback, not the mirror itself¹.

It sounds almost too simple, and in a way it is. The kit can be a single mirror or a purpose-made mirror box, and the affected hand stays out of sight behind it. What matters is attention: you have to actually watch the reflection and stay with the movement. This is usually led by the occupational therapist or physiotherapist on your team, so it fits naturally with occupational therapy after stroke and the roles set out in the rehabilitation team.

How does mirror therapy work in the brain?

Mirror therapy is thought to work by feeding the brain a visual signal that the affected limb is moving, which helps re-engage the movement networks on the damaged side. That fits the core principle of stroke recovery, that the brain can reorganise through practice and feedback, the same neuroplasticity that underpins intensive, repetitive rehabilitation³.

Recovery is fastest in the first 3 to 6 months, with heightened plasticity around 60 to 90 days, which is often when mirror therapy is introduced, though gains continue beyond that window³. I will not pretend I felt my brain rewiring. What I did notice, over weeks rather than days, was that the reflection stopped feeling like a trick and started feeling like a target. The mechanism story is worth understanding in full in how neuroplasticity drives recovery.

Does the evidence support mirror therapy?

The best evidence, a large Cochrane review, found mirror therapy produces a small-to-moderate improvement in movement and in everyday arm function compared with other approaches, and it may also reduce pain. On that basis the UK NICE guideline (NG236) recommends it as an adjunct after stroke, so it is a genuinely endorsed technique, not a fringe one¹².

I want to be straight about the size of that effect, because the network I write for exists partly to stop the overselling. Small-to-moderate means helpful, not miraculous. It adds to conventional therapy; it does not do the heavy lifting on its own. That honesty is the point: the arm is the worst-recovering part after a stroke, with about half of people regaining some useful function by 6 months and complete arm recovery in under about 15%, and no single adjunct changes those numbers by itself³. For the fuller reckoning see arm and hand recovery after stroke.

What is the typical mirror therapy dose?

A common protocol across the trials is about 30 minutes a day, 5 days a week, for around 4 weeks, delivered alongside your usual physiotherapy and occupational therapy rather than instead of it. These figures are a typical starting point, not a fixed prescription; your team will set the schedule around what you can tolerate and what you are working towards¹.

That 5-days-a-week rhythm mirrors the wider intensity consensus in stroke rehabilitation, where guidelines converge on at least 3 hours of therapy a day on at least 5 days out of 7 for people who can tolerate it². Mirror therapy is one slice of that total, not the whole of it. If you want to understand where dose fits in the bigger programme, read how much therapy do you need. Practically, 30 minutes is longer than it sounds when you are concentrating hard on a reflection, and I found short, focused sessions beat one long distracted one.

Which limb is mirror therapy used for?

Mirror therapy is used mainly for the affected arm and hand, where the evidence is strongest and the benefit for everyday function is clearest. It has been trialled for the lower limb as well, but the case for the leg is less established, so most programmes apply it first to the upper limb¹. Upper-limb motor recovery is often tracked on the Fugl-Meyer scale, which scores arm impairment from 0 to 66, so your team can see whether the movement you are practising is translating into measurable change⁴.

This is why it slots so neatly alongside occupational therapy and hand-focused work rather than gait work. It is not the tool for getting you walking again; that is the job of physiotherapy after stroke and gait-specific training. Mirror therapy earns its place on the fine, frustrating business of coaxing a hand back, which is where I needed the most help and the most patience.

Can you do mirror therapy at home?

Yes: once a therapist has assessed you and shown you the technique, mirror therapy can be practised at home because it is safe, low-cost, and needs little more than a mirror or a mirror box. That accessibility is one of its real strengths, especially as formal therapy time is often limited and the 3-hours-a-day target is not always met in practice².

The part no one warns you about is that doing it alone is harder than doing it with someone watching. It is easy to let the weak hand creep into view, or to go through the motions while your mind wanders. When I was disciplined about it, keeping the bad hand hidden and genuinely watching the reflection, it felt like work; when I was lazy, it felt like nothing, and it did nothing. Home practice is where an adjunct like this either becomes useful or becomes wallpaper, which is worth remembering when you are staying motivated in long-term rehab.

How does mirror therapy fit with other treatments?

Mirror therapy is an adjunct, one of several techniques layered on top of conventional, task-specific rehabilitation, never a replacement for it. The core of recovery remains repetitive, task-specific practice, the approach with the strongest guideline grade, with adjuncts added where they suit the person³.

It sits in the same family as other movement adjuncts you may hear about, each with its own eligibility and evidence: constraint-induced movement therapy for people with some residual wrist and finger movement, functional electrical stimulation for stimulating weak muscles, and task-specific training as the backbone of the lot. The skill is not in finding one magic technique but in stacking the right adjuncts onto a solid base, which is a conversation to have as part of goal-setting in rehabilitation.