Why Do Eye Movements Help With Distressing Memories?
It sounds strange at first.
You remember something painful.
At the same time, you follow a moving target with your eyes.
And afterward, the memory may feel different.
Less sharp.
Less immediate.
Less emotionally intense.
Sometimes farther away.
This happens in therapies including EMDR and Accelerated Resolution Therapy, or ART.
But why?
Why would moving your eyes change the way a memory feels?
The most scientifically responsible answer is:
Researchers do not yet know the entire mechanism.
But we do have some strong clues.
One of the best-supported explanations involves working memory.
A distressing memory uses mental resources
When you bring a vivid memory to mind, your brain is doing work.
You may see the image.
Hear sounds.
Feel what happened in your body.
Remember words.
Experience emotion.
That mental representation requires cognitive resources.
At the same time, following a moving target with your eyes also takes attention.
So now your brain is trying to do two things at once.
That competition appears to change the memory.
Working memory has limited capacity
Working memory is the mental system that allows you to temporarily hold and manipulate information.
It has limits.
You can experience this in ordinary life.
Try remembering a phone number while doing complicated mental math.
Both become harder.
The same principle may apply when you recall an emotionally vivid memory while performing another demanding task.
The memory and the eye movements compete for limited working-memory capacity.
This is often called the working-memory account of eye movements in trauma therapy.
What happens when the two tasks compete?
According to this theory, there are not enough working-memory resources available to maintain the distressing memory at its original level of vividness while also tracking the visual stimulus.
The memory may become:
less sharp,
less detailed,
less immersive,
or less emotionally intense.
When the memory is later retrieved again, some of that change may persist.
Laboratory studies have repeatedly found that performing eye movements while recalling negative autobiographical memories can reduce subsequent ratings of vividness and emotionality compared with recalling the memory alone.
The effect seems stronger for vividness than emotion
This is one of the more interesting findings.
A 2020 meta-analysis of 15 laboratory studies involving 942 participants found that eye movements reduced both vividness and emotionality of negative autobiographical memories compared with control conditions.
But the reduction was larger for vividness than for emotionality.
That pattern makes sense within working-memory theory.
The immediate effect may be strongest on the sensory representation of the memory.
The picture becomes less vivid.
And when the picture feels less vivid, the emotional response may also decrease.
Imagine turning down the resolution
One way to picture this is to imagine a memory as a high-resolution image.
Before processing, it may feel:
bright,
close,
detailed,
and immediate.
Now you bring that image to mind while also doing a demanding visual task.
The image has fewer cognitive resources available to remain at full resolution.
It may become fuzzier.
Less immersive.
Less intense.
The factual memory is still there.
But the sensory experience of remembering may change.
Eye movements do not erase memory
This distinction is essential.
The goal is not amnesia.
You usually still know what happened.
You remember:
who was there,
what occurred,
what it meant,
and why it mattered.
What may change is how strongly the memory activates you.
Instead of:
“I know this happened, and I feel like I am back there,”
the experience may become:
“I know this happened, but it feels like something that happened in the past.”
That is a very different relationship to memory.
Why does vividness matter so much?
Distressing memories can be especially powerful because they are sensory.
You do not merely know what happened.
You can see it.
Hear it.
Feel it.
The memory can arrive almost like a present-tense event.
That is why intrusive images can be so disruptive.
If the sensory vividness decreases, the memory may become easier to hold as ordinary autobiographical information rather than something that repeatedly hijacks attention.
This may help explain why eye-movement tasks appear to affect vividness particularly strongly.
Is it really the eye movement that matters?
This question gets very interesting.
Researchers have compared eye movements with other tasks that also compete for working-memory resources.
These have included things such as counting and other attention-demanding tasks.
The same 2020 meta-analysis found that alternative dual tasks also reduced memory vividness and emotionality.
Eye movements showed a small advantage for vividness over alternative tasks, but the overall pattern suggested that the broader dual-task effect may be important.
That supports the idea that what matters may not be some mysterious property unique to moving your eyes left and right.
The cognitive competition itself may be doing part of the work.
So is “bilateral stimulation” the right explanation?
Clinically, the term is useful.
Scientifically, it can be misleading if it implies that the key ingredient is simply alternating stimulation from the left side to the right.
Current research gives us good reasons to think about:
working-memory taxation,
dual attention,
memory retrieval,
cognitive load,
and emotional processing.
Those concepts may be more useful than saying bilateral stimulation “balances the brain.”
Does this mean tapping and sounds work exactly the same way?
Not necessarily.
Different tasks place different demands on working memory.
Some may be more visually demanding.
Some more auditory.
Some more motor-based.
And the amount of cognitive load may matter.
The 2020 meta-analysis found that alternative dual tasks could reduce vividness and emotionality too, but it also noted that the laboratory evidence is limited and does not automatically tell us which procedures work best clinically.
So we should not assume every alternating stimulus is equivalent.
Why not just use the hardest possible task?
Because there may be an optimal level of difficulty.
If the secondary task is too easy, it may not compete enough with the memory.
If it is too difficult, you may not be able to keep the memory active.
The goal is not to overwhelm working memory completely.
It is to create enough competition to change how the memory is being experienced while still keeping the relevant material accessible.
That balance is one reason the therapeutic context matters.
What is dual attention?
Another useful concept is dual attention.
Part of your attention is on the distressing memory.
Part is on something happening in the present.
The therapist.
The moving hand.
The room.
The task.
That means you are simultaneously:
there,
and here.
The memory is active.
But you are also anchored in present experience.
This may help reduce the sense that the past event is happening again right now.
Why trauma memories can feel present
One of the striking features of trauma is that memory can feel unusually immediate.
A trigger happens.
Suddenly your body reacts.
The image appears.
The emotion arrives.
You may intellectually know:
“This is over.”
But your nervous system responds:
“This is happening.”
Therapies such as ART and EMDR may help the memory become more clearly encoded and experienced as past rather than present.
Eye movements may contribute to that shift.
Does memory reconsolidation play a role?
Possibly.
When a memory is retrieved, it may temporarily become more open to modification before being stored again.
This process is commonly discussed as memory reconsolidation.
That makes it tempting to say:
“The eye movements reconsolidate the memory.”
But that is too definitive.
Memory reconsolidation may be one piece of the explanation.
Working-memory changes may influence what is being re-stored.
New emotional information may matter.
Changes in imagery may matter.
Reduced arousal may matter.
We still do not know exactly how these processes interact clinically.
What about the orienting response?
Researchers have also proposed that eye movements may trigger an orienting response.
Humans naturally orient toward changing stimuli.
Movement captures attention.
The body initially becomes alert.
When the stimulus turns out not to be dangerous, that response may shift toward reduced arousal.
Some researchers have proposed that repeated orienting may help people contact distressing memories without remaining at the same level of physiological activation.
This may contribute.
But it is probably not the whole story.
Do eye movements work by connecting the two sides of the brain?
This is one of the most popular explanations.
It is also much too simplistic.
You may hear:
“The eye movements activate both hemispheres.”
“They integrate the logical left brain and emotional right brain.”
“They synchronize both sides of the brain.”
These statements sound impressive.
But they do not reflect an established explanation of how eye movements reduce traumatic memory distress.
The brain does not operate as two mostly separate systems that become “balanced” by watching something move left and right.
Current evidence fits much better with more complex explanations involving attention, working memory, arousal, and memory processing.
Do eye movements imitate REM sleep?
This is another popular theory.
Rapid eye movements occur during REM sleep.
Memory and emotion are also processed during sleep.
So the comparison is understandable.
But similarity does not prove identical mechanism.
We cannot currently say that EMDR or ART works by recreating REM sleep while someone is awake.
It remains an interesting hypothesis rather than an established explanation.
What happens in EMDR?
In EMDR, the client identifies a target memory and related imagery, beliefs, emotions, and body sensations.
During reprocessing, the client engages with that material while completing sets of bilateral stimulation, often visually guided eye movements.
The therapist then asks what the client notices.
New images, thoughts, sensations, emotions, or related memories may emerge.
The process is generally associative.
The client's memory network helps determine where the work goes next.
What happens in ART?
ART also uses visually guided eye movements while emotionally meaningful material is active.
But the structure is different.
ART tends to be more directive.
It incorporates:
memory recall,
attention to body sensations,
repeated eye-movement sets,
and deliberate imagery procedures.
That means broader eye-movement research may help explain one part of ART.
But ART also includes other therapeutic mechanisms that cannot be reduced to working memory alone.
Why can ART and EMDR both use eye movements but feel so different?
Because the eye movements are not the therapy.
They are one component.
Imagine two recipes using the same ingredient.
That does not make the meals identical.
ART and EMDR differ in:
protocol structure,
therapist direction,
imagery,
associative processing,
cognition work,
body awareness,
pacing,
and what happens between eye-movement sets.
A shared eye-movement mechanism could operate inside two very different treatment experiences.
What about imagery?
Imagery is especially important in ART.
Distressing memories are often stored or experienced visually.
An image may become the part that keeps intruding.
The hospital bed.
The accident.
The moment you discovered a betrayal.
A loved one's final moments.
A humiliating experience.
ART combines eye movements with structured imagery work.
If eye movements reduce vividness while imagery procedures change how the scene is internally represented, those mechanisms may interact.
That possibility is especially interesting scientifically.
Can eye movements help with imagined future events too?
Potentially.
Working-memory research has examined not only past memories but also distressing mental imagery.
People can become activated by scenes that have not happened.
The presentation.
The medical procedure.
The difficult conversation.
The flight.
The confrontation.
The feared future.
If the internal image itself is vivid and emotionally charged, similar working-memory principles may be relevant.
That is one reason trauma-focused therapies sometimes work with future imagery as well as past events.
Why can a memory remain upsetting even when you understand it?
Because understanding does not necessarily change sensory or emotional activation.
You may know:
“I am safe.”
And still feel panic.
You may know:
“It wasn't my fault.”
And still feel shame.
You may know:
“The relationship is over.”
And still see the discovery scene.
You may know:
“The medical procedure happened years ago.”
And still feel your body brace.
Insight and memory processing are related.
They are not identical.
Why do some memories seem especially suited to this work?
Eye-movement approaches may be especially relevant when distress is strongly linked to:
a particular image,
a vivid scene,
an intrusive memory,
a body response,
or a feared future image.
For example:
“I keep seeing the accident.”
“I cannot stop seeing the message on the phone.”
“I see the hospital room every time I think about my mother.”
“I know the presentation will probably be fine, but I keep seeing myself fail.”
Those are highly imaginal experiences.
Changing the vividness or emotional charge of the imagery may be clinically meaningful.
Does less vivid mean less important?
No.
A memory can become less vivid without becoming less meaningful.
This distinction is essential.
The goal is not to trivialize what happened.
It is not to make the person stop caring.
It is not to rewrite their values.
A memory can still matter enormously without repeatedly flooding the nervous system.
You can know:
“That changed my life.”
without feeling:
“It is happening again.”
Is the mechanism completely understood?
No.
And that should not be embarrassing.
Many effective treatments were used long before every underlying biological mechanism was understood.
Research tells us that eye movements and other dual tasks can reduce the vividness and emotionality of negative memories under laboratory conditions.
Working-memory competition provides a strong explanation for those findings.
But the leap from laboratory memory effects to complete clinical recovery is not fully mapped.
The 2020 meta-analysis specifically cautioned that laboratory findings cannot simply be generalized to clinical treatment and noted that the link between changes in vividness/emotionality and symptom improvement remains an important research question.
That nuance matters.
What we can reasonably say
We can reasonably say that:
Eye movements require attention.
Emotional memories require working-memory resources.
Doing both simultaneously creates cognitive competition.
Experimental studies show that this can reduce memory vividness and emotionality.
Other demanding tasks can create similar effects.
The effect appears particularly strong for vividness.
These mechanisms may contribute to therapies such as EMDR and ART.
And we still do not know exactly how all the pieces interact during successful clinical treatment.
What we probably should not say
We should be cautious about claiming:
“Eye movements erase trauma.”
“Bilateral stimulation balances the hemispheres.”
“EMDR switches off the amygdala.”
“ART rewires the brain.”
“Eye movements recreate REM sleep.”
“Your traumatic memory gets moved into another part of the brain.”
These statements make complicated science sound settled when it is not.
The actual research is more interesting.
Why I care about the science
I use both ART and EMDR.
Learning both therapies has made me increasingly interested in what the eye movements are actually doing.
Not the marketing explanation.
Not the neuroscience soundbite.
The mechanism.
Why does vividness change?
Why do some images become less emotionally charged?
What role does working memory play?
What does imagery contribute?
What does dual attention contribute?
What happens when the body response changes?
Why does ART's more directive imagery work feel so different from EMDR's more associative reprocessing?
Those questions matter clinically.
They also matter because clients deserve explanations that distinguish evidence from theory.
Working with Laura Geftman, LCSW
I use Accelerated Resolution Therapy and EMDR as part of a broader trauma-focused practice.
My work may also incorporate IFS, Cognitive Processing Therapy, Prolonged Exposure, CBT, psychodynamic, interpersonal, attachment, and schema therapies depending on the client and the clinical question.
I offer focused trauma therapy and therapy intensives for adults in Pennsylvania, New Jersey, New York, and Florida.
In-person therapy intensives are available in Ardmore, PA, on the Main Line near Philadelphia.
Virtual therapy may also be available when clinically appropriate.
Interested in ART, EMDR, or focused trauma therapy?
If you understand what happened but a particular memory, image, trigger, body response, or emotional reaction still feels stuck, ART, EMDR, or another focused trauma approach may be worth exploring.
The goal is not to choose a modality because eye movements sound unusual.
The goal is to understand what kind of work fits the memory, the client, and the treatment goal.
Suggested Reading
If you are interested in eye movements, bilateral stimulation, ART, EMDR, or trauma memory, these related articles may be helpful:
How Do Eye Movements Work in Accelerated Resolution Therapy?
ART vs. EMDR: How Is Bilateral Stimulation Used Differently?
FAQ
Why do eye movements help with distressing memories?
One leading explanation is working-memory competition. Recalling a vivid emotional memory and simultaneously making eye movements both require cognitive resources. Because working memory has limited capacity, performing both tasks at once may reduce the memory's vividness and emotional intensity.
Do eye movements erase traumatic memories?
No. Eye movements do not erase autobiographical memory. The person generally still knows what happened. What may change is how vivid, immediate, or emotionally activating the memory feels.
Does bilateral stimulation activate both sides of the brain?
The idea that bilateral stimulation works simply by balancing or integrating the brain's left and right hemispheres is not an established scientific explanation. Current evidence better supports mechanisms involving working memory, dual attention, cognitive load, and memory processing.
Why does a memory become less vivid after eye movements?
The working-memory account proposes that eye movements compete with the memory for limited cognitive resources. Laboratory research has found that eye movements during recall can reduce subsequent memory vividness, with effects on vividness generally larger than effects on emotionality.
Do tasks other than eye movements work too?
Yes, some laboratory studies have found that other demanding dual tasks can also reduce the vividness and emotionality of negative memories. This supports the idea that working-memory competition may be important.
Does EMDR work because of eye movements?
Eye movements appear to contribute to memory effects, but EMDR is a complete psychotherapy protocol containing many other components. The exact contribution of eye movements to clinical recovery remains an area of research.
Do ART eye movements work the same way as EMDR eye movements?
They may share some mechanisms, particularly working-memory competition and dual attention, but ART and EMDR use eye movements within different protocols. It cannot be assumed that their complete mechanisms are identical.
Is memory reconsolidation involved?
It may be. Reactivated memories can become modifiable under some circumstances, and reconsolidation may contribute to trauma therapy. But it has not been established as the single mechanism explaining the effects of eye movements.
Do eye movements reproduce REM sleep?
That has been proposed, but it is not established. The fact that both REM sleep and these therapies involve eye movements does not demonstrate that they work through the same biological process.
Is working-memory theory proven?
Working-memory theory has substantial experimental support and explains many findings involving eye movements and emotional memories. It does not yet explain every aspect of how ART or EMDR produces clinical improvement.