Can Bilateral Stimulation Be Too Fast?

Can Bilateral Stimulation Be Too Fast?

Short Answer: Yes, bilateral stimulation can be too fast for a particular person or moment if it becomes difficult to follow or demands so much attention that you cannot stay engaged with the memory, thought, feeling, or body sensation you are working on. However, there is no single speed that is universally “too fast.” Research suggests that faster eye movements can place greater demands on working memory and may sometimes produce stronger effects than slower movements, but faster is not automatically better. The useful pace is one you can follow while still staying connected to the EMDR process.

Key Takeaways

• There is no universal maximum speed for bilateral stimulation.
• Faster eye movements generally place greater demands on attention and working memory.
• A pace can become too fast if you cannot reliably follow the stimulation.
• Faster does not automatically mean more effective.
• The speed can be adjusted during Eye Movement Desensitization and Reprocessing (EMDR).
• Different people—and even different sessions for the same person—may work better with different speeds.

What Does “Too Fast” Mean in EMDR?

In EMDR, bilateral stimulation may involve:

• Following a visual target from side to side
• Listening to alternating sounds
• Feeling alternating taps or pulses

Each of these can be delivered at different speeds.

“Too fast” does not refer to one specific number that applies to everyone.

Instead, the speed may be too fast when the stimulation stops being a workable dual-attention task.

For example, if a visual target moves so quickly that you repeatedly lose it or spend nearly all your attention trying to keep up, the pace may no longer be useful for that moment.

The goal is not simply to move your eyes, hear tones, or feel taps as quickly as possible.

Why Can Faster Stimulation Have a Stronger Effect?

One leading explanation for EMDR involves working memory.

Working memory is the limited mental space you use to temporarily hold and work with information.

Recalling a vivid or emotional memory uses some of that capacity. Following eye movements at the same time also uses mental resources.

Research has found that faster eye movements can place greater demands on working memory than slower movements. In experimental studies, faster movements have also produced larger reductions in memory vividness and emotionality than slower movements.

This supports the idea that making the secondary task more demanding can influence how strongly it competes with memory recall.

But that does not mean the best strategy is simply to make the stimulation faster and faster.

Why Isn't Faster Always Better?

A dual-attention task needs to demand attention without becoming the only thing you can pay attention to.

If the stimulation becomes so fast that all your effort goes into following it, you may have difficulty maintaining attention on the memory or other focus at the same time.

That would change the balance of the task.

EMDR involves doing both:

keeping some attention on the material being processed + following the bilateral stimulation

The purpose is not to replace the memory task with a speed-tracking exercise.

Research supports the idea that more demanding eye movements can increase working-memory load, but studies have not established a rule that the fastest possible movement produces the best therapeutic result.

Is There a Maximum Recommended Speed?

There is no single scientifically established maximum speed that applies to everyone.

Experimental studies often use standardized movement speeds so researchers can compare conditions.

For example, one study compared eye movements at approximately 0.8 cycles per second with faster movements at approximately 1.2 cycles per second. Faster movements produced stronger effects on memory vividness and emotionality in that experiment.

Those research settings should not be interpreted as universal instructions for exactly how fast every EMDR session should be.

In practice, speed is an adjustable part of bilateral stimulation.

How Can You Tell if Visual Stimulation Is Moving Too Fast?

A practical sign is simply that you cannot consistently follow the visual target.

You might notice that:

• Your eyes repeatedly lose the target
• You have to guess where the target is going
• Tracking it requires nearly all of your concentration
• It becomes difficult to stay connected to the memory or other focus

In that situation, slowing the target can make the task easier to follow.

That does not mean slower stimulation is inherently better.

It means the stimulation needs to remain usable.

Can Eye Movements Also Be Too Slow?

Potentially, yes.

If the eye movements are extremely easy and barely require attention, they may place less demand on working memory.

Research comparing slow and fast eye movements has found that faster movements can create greater cognitive load and stronger reductions in memory vividness and emotionality.

So the goal is not simply “slow enough to be comfortable.”

The stimulation should still require some attention.

The useful range is generally somewhere between so easy that it demands almost no attention and so difficult that you cannot follow it while staying engaged with the memory.

Does the Right Speed Depend on the Person?

Yes.

People differ in:

• How quickly they can comfortably track visual movement
• How attention-demanding a particular speed feels
• How vivid or absorbing the memory feels
• Which type of bilateral stimulation they are using

Researchers have tested whether eye-movement speed should be mathematically matched to a person's measured working-memory capacity.

One study found that faster eye movements produced stronger effects overall but did not find support for precisely tailoring the speed according to individual working-memory capacity.

So individual adjustment can still make practical sense, but science has not produced a simple formula for calculating everyone's ideal speed.

Someone working through stress may also find that the same stimulation speed feels different depending on how demanding the material feels that day.

Can the Right Speed Change During a Session?

Yes.

A speed that works well during one part of a session may feel different later.

The material being processed can change from set to set.

For example, you may move from:

• A vivid image to a less vivid one
• One emotion to another
• A memory to a body sensation
• One association to a different memory

Your attention can also change.

Because of that, the speed of bilateral stimulation does not have to remain identical throughout the session.

A practitioner may make it faster or slower depending on how easily you are following it and how the processing is unfolding.

The pace may also feel different when EMDR is being used for memories connected to grief, because the material being processed can shift from set to set.

Can the Same Speed Feel Different on Different Days?

Yes.

The same setting can feel easy during one session and more demanding during another.

Attention, familiarity with the stimulation, the memory being processed, and the overall task can all influence how the speed feels.

Research on working memory also shows individual variation in how strongly different attention-demanding tasks affect memory.

So there is no requirement that one speed always feel the same.

What About Auditory Bilateral Stimulation?

Alternating sounds can also be delivered at different speeds.

The same general principle applies: the sound should alternate clearly enough to create an attention task without becoming difficult to follow.

However, auditory stimulation and eye movements are not identical tasks.

Research comparing alternating beeps with eye movements found that both taxed working memory, but eye movements created a larger working-memory demand and larger reductions in memory vividness in that experiment.

That means a numerical speed used for auditory stimulation should not automatically be assumed to have the same effect as that same numerical speed in visual stimulation.

What About Tactile Bilateral Stimulation?

Tapping or tactile pulses can also be faster or slower.

Again, there is no universal number that defines “too fast.”

A useful rhythm should remain clear enough that you can follow the alternating pattern while also staying engaged with what you are processing.

Visual, auditory, and tactile bilateral stimulation involve different sensory systems, so they do not necessarily need to use identical speeds.

Does Faster Stimulation Mean the Session Is More Powerful?

No.

How fast the stimulation is should not be treated as a score for how strong or successful the session is.

Faster eye movements can increase working-memory demand, but EMDR includes much more than stimulation speed.

The process also involves:

• What you are focusing on
• How the memory changes
• What thoughts or emotions arise
• What happens between sets
• How the processing develops over time

Speed is one adjustable variable within that larger process.

What About Speed in Self-Guided EMDR?

Speed can also be adjusted in online and self-guided EMDR.

With the Virtual EMDR self-guided program, users manage their own pacing and can adjust available bilateral stimulation settings.

The same practical principle applies: the goal is not to choose the fastest available setting.

A useful speed is one that demands attention while still allowing you to stay engaged with the memory, thought, feeling, image, or body sensation you are working on.

Conclusion

Bilateral stimulation can be too fast for a particular person or moment, but there is no universal speed at which it suddenly becomes too fast.

Research suggests that faster eye movements can demand more working-memory resources and may sometimes have stronger effects on memory vividness and emotionality than slower movements.

But faster is not automatically better.

The stimulation still needs to be something you can follow while remaining engaged with the memory, thought, feeling, image, or body sensation you are processing.

The practical goal is therefore not maximum speed. It is an attention-demanding but workable pace that allows both parts of the EMDR task to happen at the same time.