Retained Primitive Reflexes in Adults: Signs and Support

You went looking for answers about your child. Somewhere in a list of symptoms, you stopped. The startle at every unexpected sound. The tension you can never quite set down. The car sickness. The sense that you have been clumsy your whole life. You recognized yourself on almost every line.

Now you are wondering something you did not expect to wonder. Is this me too? And is it too late to do anything about it?

It is not too late. Retained primitive reflexes in adults are more common than most people realize, and the same nervous system that learned to work around them can still learn something new.

What are primitive reflexes, and why do they usually fade in infancy?

Primitive reflexes are automatic movements you are born with, controlled by the brainstem, and a healthy brain usually switches them off within the first year of life. A newborn cannot yet run the higher areas of the brain, so these built-in patterns handle survival first.

The Moro reflex, often called the startle reflex, throws the arms wide at a sudden change and helps a baby take that first breath. The asymmetrical tonic neck reflex (ATNR) links head turning to arm movement. The spinal Galant reflex makes the lower back arch when the side of the spine is touched.

As the brain matures, these infantile reflexes are meant to give way to voluntary motor skills. Most fade between four and six months and the first birthday, according to the medical reference StatPearls. That handoff is one of the earliest developmental stages, where fine motor control, balance, and coordination begin to build.

Why do some adults still have retained primitive reflexes?

Sometimes a reflex is retained because the brain never fully completed the movement patterns that switch it off. The reflex does not vanish. It stays quietly active in the background, woven into how the nervous system organizes everything else.

The reasons are usually about circumstance, not character. A stressful or traumatic birth, an early illness, limited floor time as a baby, or a skipped crawling stage can all interrupt the sequence. The persistence of primitive reflexes past infancy is not a personal failing or a sign of low intelligence.

Many adults who carry them were the child who could not sit still, who walked on toes, or who wet the bed longer than other kids. Those childhood clues fade from memory, but the underlying retention of primitive reflexes can travel with you into adult life. This is exactly the pattern a movement-based program works with.

What is NeuroDevelopmental Movement? NeuroDevelopmental Movement (NDM) is a gentle, movement-based program that guides the brain back through the developmental movement patterns it may have missed the first time around. Active Healing in Danvers, MA has used it for more than 30 years to support children and adults working through developmental and neurological challenges. Learn how NDM works.

Signs of retained primitive reflexes in adults

In adults, retained reflexes rarely look dramatic. They show up as patterns you have lived with so long they feel like personality rather than physiology.

• Retained Moro reflex. An easy startle, a nervous system that feels stuck on alert, sensitivity to bright light, loud sound, or crowds, and a hard time switching off at night. The startle reflex keeps sounding the alarm when there is no real threat, which many people experience as constant anxiety.
• Retained ATNR. Trouble with balance when you turn your head, motion sickness and car sickness, difficulty crossing the midline of the body, and fine motor tasks like handwriting that never felt natural. The tonic neck pattern keeps the head and arms tied together when they should move on their own.
• Retained spinal Galant reflex. Fidgeting, a genuine inability to sit still for long, and irritation from waistbands or clothing tags. As a child this same spinal Galant reflex is often linked to bedwetting past the usual age.
• Retained postural reflexes. Slumped posture, low muscle tone, poor spatial awareness, and a body that works harder than it should just to stay upright.

These signs also overlap with attention and focus challenges. One 2023 review in Frontiers in Psychiatry found a moderate association between ADHD and two retained reflexes, the asymmetrical tonic neck reflex and the symmetric tonic neck reflex. That is an association, not a diagnosis. Retained primitive reflexes and ADHD can share the same surface signs without one causing the other, and only a qualified professional can sort that out. If you first found this while reading about your child, our guide to the signs parents notice in children covers these same reflexes from the other side.

Why compensating for retained reflexes is so exhausting

The tiredness is not in your head. Holding a nervous system on alert all day burns real energy, and compensation is quiet, constant work.

When a reflex is retained, you build workarounds without noticing. You avoid the roller coaster, the boat, the crowded room. You concentrate harder on the fine motor skills and balance tasks that other people do automatically, because the development of motor skills never fully became automatic for you.

All of that draws down the same resources you need for focus, short-term memory, and calm. It is why coping can feel fine for years and then, under stress or poor sleep, suddenly does not.

Can adults integrate primitive reflexes? What the research suggests

Yes, adults can work on reflex integration, because the brain keeps its ability to form new neural pathways well into adulthood. Age closes fewer doors here than people assume.

Reflex integration is not about forcing the reflex to stop. It is about giving the central nervous system another chance to complete the slow, repeated movement patterns of those early developmental stages, so the reflex finally settles. Researchers describe retained reflexes as amenable to change, with specific motor exercises able to stimulate neuroplasticity over time.

We want to be honest about where the science stands. The formal evidence for primitive reflex integration in adults is still developing, and researchers themselves note the limits. This is support and education, not a cure. What we can say plainly is that the capacity for change does not expire on your first birthday.

What adult NDM sessions look like

An adult NDM program starts with an evaluation, not exercises. Someone watches how you move, checks which reflexes still seem active, and builds a picture of where your nervous system got interrupted. Nothing about it is strenuous.

The work itself is small and slow on purpose. Gentle, repeated movements revisit the developmental movement patterns a reflex belongs to, done one on one with an experienced guide and practiced at home between visits. Integrating primitive reflexes is patient work measured in weeks and months, not a single session.

Active Healing has done this in Danvers for more than 30 years, and that history includes adult clients, not only children. To compare it against what home checks can and cannot tell you, you can also run a simple set of at-home reflex screening checks first.

Ready to see if this fits what you have been feeling?

If you read the signs above and quietly recognized yourself, that recognition is worth acting on. The next step is not a commitment, it is a conversation.

Reach out and we will tell you honestly whether reflex integration is a fit for what you are dealing with, or whether something else would serve you better. You can book an adult NDM evaluation whenever you are ready.