EMDR Tapping vs Eye Movements: Does BLS Type Matter?

Not entirely, and it depends on what you’re measuring. Direct comparisons show eye movements have a modest edge in reducing a memory’s distress and vividness. But for calming your body, heart rate and brain activity, research shows tapping and eye movements perform about the same. Neither is the “real” version of bilateral stimulation.

What are we actually comparing?

Bilateral stimulation is the alternating left-right rhythm at the center of EMDR. It comes in three common forms: visual (eyes tracking a moving target), auditory (tones switching between ears), and tactile (taps alternating between the two sides of the body, often just called tapping). “Tapping” is the informal name for that tactile version, whether it’s a therapist tapping your knees, a handheld pulser, or the butterfly hug, where you cross your arms and tap your own shoulders.

Most EMDR research over the past three decades tested eye movements, simply because that’s the form Francine Shapiro discovered first. That imbalance in study volume, not a settled verdict on effectiveness, is a big part of why eye movements look like the “default.” Whether the modality itself changes the outcome is a narrower question, and the evidence on it is more mixed than either “eye movements win” or “it’s all the same” would suggest.

For the short, direct version of this question, see does tapping work as well as eye movements? This page goes deeper: the mechanism behind modality, the head-to-head evidence, and what the research doesn’t yet settle.

Why would the modality matter at all?

The leading explanation for how bilateral stimulation works is the working memory theory. Holding a distressing memory in mind uses part of your limited working memory, and tracking a moving target, listening for alternating tones, or feeling alternating taps uses more of that same limited space. Compete for the same resource, and the memory comes out “taxed”: less vivid, less emotionally loaded.

A 2012 review in the Journal of Experimental Psychopathology by van den Hout and Engelhard lays out this account and the evidence behind it.

If that’s the real mechanism, modality shouldn’t matter much. What matters is how much mental effort the task demands, not which sense it enters through. A 2008 study in Behaviour Research and Therapy supports that reading indirectly: Gunter and Bodner found vertical eye movements reduced memory vividness and emotional intensity about as well as the “classic” horizontal ones. The direction of the movement didn’t matter; the demand of tracking it did.

That’s a reasonable basis for expecting other channels, tones and taps included, to work through the same route.

What happens when eye movements and tapping are tested directly against each other?

Direct, head-to-head comparisons are rarer than you’d expect given how often the question comes up. A few do exist.

A 2013 study in the Journal of Behavior Therapy and Experimental Psychiatry gave 64 patients a disturbing memory to hold in mind, half with PTSD and half with other mental health conditions, then compared eye movements to alternating tones. De Jongh and colleagues found a trend toward eye movements reducing the memory’s emotional charge more than tones did, in both groups.

The more relevant comparison comes from real sessions, not a lab. A 2021 survey in Frontiers in Psychology asked 23 therapists about 102 videoconference EMDR sessions and found eye movements produced significantly larger drops in subjective distress than tapping, by around 24%. That’s a meaningful gap on paper. Two caveats temper it: this was therapists’ reported observations, not a randomized trial, and remote “tapping” usually means a client tapping their own knees rather than a therapist-guided device, a less controlled comparison than it sounds.

Does tapping calm your body just as well as eye movements do?

Here the picture flips, and it’s the most useful nuance in this whole comparison. A 2025 study in BJPsych Open tested both modalities in the same 40 people, 20 with PTSD and 20 healthy controls, each trying visual and tactile bilateral stimulation in turn. Both produced similar increases in calming brain activity and similar gains in heart-rate variability, regardless of which one participants used and regardless of group.

So the honest answer splits by outcome. On subjective distress and a memory’s felt vividness, the thinner evidence available leans toward eye movements. On the body’s autonomic response, heart rate variability, EEG markers of calm, tapping holds even. Our deeper look at how bilateral stimulation affects your nervous system covers that autonomic research in full; this page is about what changes, if anything, when you swap the channel.

Eye movements vs. tapping, at a glance

	Eye movements	Tapping (tactile)
Volume of research	Deepest; the original, most-studied channel	Thinner, but growing
Distress/vividness reduction	Modest edge in direct comparisons	Real effect, trails slightly in head-to-head tests
Calming the body (HRV, EEG)	Strong, well-documented	Matches eye movements closely
Practical fit	Default in clinics and self-guided practice	Telehealth, eye strain, dissociation risk, or personal preference
Self-guided options	Moving on-screen target, following a finger	Butterfly hug, knee taps, handheld pulsers

Is there solid proof the alternating rhythm adds anything at all?

Before ranking modalities, it’s worth asking a more basic question the field still debates: does alternating stimulation of any kind add something beyond simply holding a memory in mind? The answer isn’t unanimous.

An older, often-cited 2001 meta-analysis in the Journal of Consulting and Clinical Psychology by Davidson and Parker found no added benefit from eye movements when EMDR was compared with the identical procedure minus the eye movements. A larger, later 2013 meta-analysis in the Journal of Behavior Therapy and Experimental Psychiatry by Lee and Cuijpers pushed back, pooling 15 clinical comparisons and 11 lab studies. It found eye movements added a moderate, significant reduction in distress in the clinical trials (Cohen’s d = 0.41) and a larger effect in the lab studies (d = 0.74).

Two careful reviews, opposite headline conclusions, on the same underlying question. That disagreement matters here: if researchers can’t fully agree whether eye movements add anything over plain recall, a confident ranking of eye movements over tapping deserves the same caution. The honest summary, in both places, is a lean rather than a verdict.

Why does EMDR default to eye movements if the evidence is this mixed?

Mostly history, not a trial result. Psychologist Francine Shapiro discovered the effect by accident in 1987, noticing that a disturbing thought lost its charge while her eyes moved rapidly back and forth on a walk. She built the first published study and the therapy that followed around what she’d stumbled onto, and researchers since have studied that same channel far more than the alternatives.

Tones and taps came later, added as practical accommodations, not as downgrades. The EMDR Institute lists all three, eye movements, tones, and taps, as legitimate forms of what it calls dual attention stimuli. A trained therapist switches between them based on what works for a given client: eye strain, a screen-based telehealth session, or a client who dissociates more easily while tracking a moving target are all reasons to switch, not signs that tapping is a lesser substitute. Our companion piece on why EMDR uses eye movements goes deeper on that history and the working-memory account behind it.

Is this the same “tapping” as EFT?

No, and it’s a common mix-up worth clearing up here. EMDR’s tapping is a plain alternating left-right rhythm, standing in for eye movements or tones, with no fixed sequence. EFT tapping is a different technique entirely: a set sequence of acupressure points, tapped in order while you name the problem out loud. They share a word and a physical motion, not a theory.

What this means if you’re practicing bilateral stimulation yourself

For everyday stress, the practical takeaway is straightforward: use whichever channel you can actually sustain attention on. If following a moving point with your eyes feels natural, do that. If it feels tiring, or you’d rather keep your eyes closed, the butterfly hug, crossing your arms and tapping your shoulders in a slow, alternating rhythm, draws on the same tactile channel the research above tested, and it costs nothing to try.

EmEase, a self-guided EMDR app, builds in two of the channels this research covers: a moving on-screen target for visual bilateral stimulation, and alternating audio tones if you’d rather close your eyes, both paced and adjustable at app.emease.com. Prefer a tactile rhythm like the butterfly hug above? That’s a manual practice you can pair with either one. Either way, treat this as a wellness practice for everyday stress and looping thoughts, not a stand-in for therapist-led work on anything heavier.

What the research doesn’t yet settle

A few honest limits belong here. Most of the modality comparisons above involve small samples, several dozen participants at most, and single-session lab or clinic measures rather than full courses of treatment tracked over months. The 2021 videoconference survey was observational, based on therapist recall, not a controlled trial designed to isolate modality as the one variable that changed. And none of this research tested a self-guided app specifically; it studied modality differences inside therapist-delivered sessions or lab paradigms, a different setting than practicing alone at home.

The bottom line

Does the type of bilateral stimulation matter? A little, and only on some measures. Eye movements carry the deepest research base and a modest edge on reducing a memory’s distress and vividness in direct comparisons.

Tapping matches eye movements closely on calming the body, and it’s a genuinely solid choice whenever eye movements are uncomfortable, impractical for telehealth, or just not your preference. The bigger, more honest point is that researchers still debate how much the alternating rhythm itself adds, regardless of channel. Pick the one you’ll actually keep using: the evidence doesn’t clearly punish that choice.