What Is Visual Bilateral Stimulation?

What Is Visual Bilateral Stimulation?

Short Answer: Visual bilateral stimulation is a form of stimulation used during Eye Movement Desensitization and Reprocessing (EMDR) in which you follow a visual target moving back and forth, usually from left to right. The target might be a therapist’s fingers, a light, or a dot moving across a screen. While following the movement, you also briefly focus on a memory, thought, feeling, image, or body sensation. Visual bilateral stimulation is the form most closely associated with EMDR, although alternating sounds and tapping can also be used.

Key Takeaways

• Visual bilateral stimulation usually involves following a target moving from side to side.
• The target may be a hand, light, moving dot, or other visual object.
• Your eyes track the target while part of your attention remains on the material being processed.
• Visual eye movements are one of the best-known and most studied forms of bilateral stimulation in EMDR.
• The speed and width of the movement can be adjusted.
• Visual stimulation is one part of EMDR, not the entire treatment process.
• EMDR can also use auditory or tactile stimulation instead of eye movements.

What Does “Visual Bilateral Stimulation” Mean?

Visual means that the stimulation is something you see.

Bilateral means that it involves two sides.

In EMDR, visual bilateral stimulation usually means repeatedly following a target as it moves across your visual field from one side to the other.

A simple pattern might look like:

Left → right → left → right

Your eyes follow that movement while your head generally stays relatively still.

Because the movement repeatedly travels across your visual field, it creates the side-to-side eye movements most people associate with EMDR.

What Can Be Used as the Visual Target?

Different things can be used.

In therapist-guided EMDR, a practitioner may move their fingers or another object from side to side.

Other options can include:

• A moving light
• A light bar
• A handheld target
• A dot moving across a computer screen
• Another clearly visible object that travels back and forth

The specific object is less important than your ability to track the movement consistently.

In online or self-guided EMDR, the visual target can be generated digitally rather than moved by another person.

How Is Visual Bilateral Stimulation Used During EMDR?

During the reprocessing parts of EMDR, you usually bring a particular memory or other focus to mind.

That might include:

• An image
• A thought
• An emotion
• A belief
• A body sensation

You then follow the visual target for a brief set.

A simplified sequence might look like this:

1. Bring the memory or other focus to mind.
2. Follow the moving target with your eyes.
3. Continue for a brief set.
4. Pause.
5. Notice what thoughts, images, emotions, memories, or body sensations are present now.
6. Continue with another set.

The visual tracking gives your attention another task while you remain connected to what you are processing.

This same process may also be used when someone is working with experiences connected to stress.

Why Does EMDR Use Eye Movements?

Researchers are still studying exactly why eye movements contribute to EMDR.

One of the leading explanations 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 a moving target with your eyes also requires attention and mental resources.

When you do both at the same time, the two tasks may compete for limited working-memory capacity.

Experimental research has found that recalling an unpleasant memory while making eye movements can reduce how vivid or emotionally intense the memory feels.

A systematic review also found reasonable support for working-memory explanations, while noting that EMDR’s full mechanism is still being studied.

Visual bilateral stimulation may be used when EMDR is focused on memories connected to childhood trauma.

Does the Target Have to Move Left and Right?

Horizontal, side-to-side movement is the traditional and most recognizable pattern.

However, research suggests that the exact horizontal direction may not be the only important feature.

Studies have found that other eye-movement patterns can also affect memory vividness and emotionality, which has led researchers to focus more on the attention demands created by the eye-movement task rather than assuming that left-to-right movement itself is the entire explanation.

So horizontal movement remains standard and familiar, but it is probably too simple to say that EMDR works only because the eyes move left and right.

How Fast Should the Visual Target Move?

There is no single speed that is correct for everyone.

The target may move faster or slower depending on:

• How easily you can follow it
• What part of the EMDR process you are in
• How attention-demanding the movement feels
• How the processing is unfolding

Research suggests that faster eye movements can place greater demands on working memory, but faster is not automatically better.

The target still needs to move at a pace you can follow while staying engaged with what you are processing.

How Wide Should the Eye Movements Be?

Visual stimulation usually needs enough horizontal range to create noticeable eye movement across the visual field.

The exact width can vary depending on the method being used and the distance between you and the target.

A very narrow movement may require less eye movement, while a wider movement can create a more obvious tracking task.

The practical goal is to create a clear visual movement that you can follow comfortably and consistently.

Do You Move Your Head or Just Your Eyes?

Usually, the goal is to follow the target mainly with your eyes rather than turning your entire head from side to side.

This creates the rapid eye-movement pattern associated with visual EMDR stimulation.

Small natural head movements may happen, but the task is primarily visual tracking.

Do Your Eyes Have to Stay Open?

Yes, if you are using visual bilateral stimulation.

You need to see the moving target in order to follow it.

If you prefer to keep your eyes closed, another form of bilateral stimulation—such as alternating sounds or tapping—can be used instead.

This is one important difference between visual, auditory, and tactile stimulation.

Is Visual Bilateral Stimulation the Same as Watching Any Moving Object?

No.

Simply watching something move from side to side is not the same as completing EMDR.

During EMDR, the visual stimulation is used within a structured process that also involves focusing on particular material, using sets, pausing, noticing changes, and continuing the processing.

EMDR includes much more than the eye movement itself.

Is Visual Bilateral Stimulation Better Than Sounds or Tapping?

Research does not support saying that one method is always best for everyone.

Eye movements have been studied more extensively than some alternatives, and research has found measurable effects from eye movements during memory recall.

For example, one study comparing eye movements with alternating beeps found that eye movements taxed working memory more strongly and produced larger reductions in memory vividness in that experiment.

That does not mean sounds or tapping cannot be used.

It means the different methods should not automatically be treated as scientifically identical.

What Does Visual Bilateral Stimulation Feel Like?

The experience can vary.

You might notice that:

• The target is easy to follow
• Your eyes feel actively engaged
• The movement requires concentration
• You become less aware of the target as your attention shifts toward the memory
• The same speed feels different from one session to another

None of these reactions automatically tells you whether the session is working better or worse.

The visual task is one part of a larger process.

Can Visual Bilateral Stimulation Be Adjusted?

Yes.

Several features can be changed, including:

• Speed
• Width of movement
• Length of each set
• The type or appearance of the visual target

A practitioner may adjust these settings during therapist-guided EMDR.

Digital and self-guided programs can also allow visual settings to be changed.

The goal is not to keep every session mechanically identical. The stimulation can be adapted while the broader EMDR process remains the same.

Visual Bilateral Stimulation in Online and Self-Guided EMDR

Visual bilateral stimulation works well in digital formats because a moving target can be displayed directly on a screen.

With the Virtual EMDR self-guided program, users can select and adjust available bilateral stimulation settings themselves.

This means visual EMDR does not require a therapist to physically move a hand in front of you.

A computer, tablet, or other screen can create the same basic visual tracking task in an online or self-guided format.

Conclusion

Visual bilateral stimulation is the side-to-side visual tracking most commonly associated with EMDR.

You follow a moving target with your eyes while also briefly focusing on a memory, thought, feeling, image, or body sensation.

The target may be a therapist’s fingers, a light, or a moving object on a screen. Its speed, width, and other settings can be adjusted.

Researchers continue to study exactly why eye movements contribute to EMDR, but evidence suggests that performing the visual tracking task while recalling a memory can affect memory vividness and emotionality.

The simplest way to understand visual bilateral stimulation is this: you follow something moving back and forth with your eyes while part of your attention remains on what you are processing.