What Are Primitive Reflexes?

Primitive reflexes are automatic, involuntary movements that develop in utero and play a crucial role in early motor and neurological development. These reflexes help infants survive, develop muscle tone, and establish the foundation for voluntary movement and cognitive function. Ideally, these reflexes should integrate (disappear) as higher brain functions mature. However, when they remain retained beyond infancy, they can impact cognitive, physical, and social-emotional development, particularly in neurodivergent individuals.

In this post, we will explore three major primitive reflexes—Asymmetrical Tonic Neck Reflex (ATNR), Moro Reflex, and Spinal Galant Reflex—and their impact on children’s development. We will also discuss how their retention into adulthood can affect function and how neurodivergent-affirming occupational therapy can support integration in a way that respects and honours individual differences.

The Three Major Primitive Reflexes

1. Asymmetrical Tonic Neck Reflex (ATNR)

Function: The ATNR is often called the “fencer’s reflex” because when an infant turns their head to one side, the arm and leg on that side extend while the opposite limbs bend. This reflex develops in utero and helps with birth canal navigation and early hand-eye coordination.

Impact on Development:

• Cognitive: Retention of ATNR can make it difficult for children to cross the midline, impacting reading and writing skills.
• Physical: Can cause difficulties with bilateral coordination, making activities like catching a ball or riding a bike challenging.
• Social-Emotional: Frustration and self-esteem issues may arise when children struggle with motor tasks that peers find easy.

2. Moro Reflex

Function: The Moro reflex, or “startle reflex,” is an automatic reaction to sudden stimuli. Infants extend their arms and legs, then pull them inward as a response to perceived danger. This reflex is crucial for early survival and developing the fight-or-flight response.

Impact on Development:

• Cognitive: Retention can lead to heightened sensitivity to stimuli, impacting focus and learning.
• Physical: Can cause postural instability, poor balance, and excessive fight-or-flight responses.
• Social-Emotional: Children may be easily overwhelmed, anxious, or experience emotional dysregulation in social settings.

3. Spinal Galant Reflex

Function: The Spinal Galant Reflex helps with movement and posture. When the lower back is stroked, the infant’s hip will tilt to that side. This reflex is involved in preparing for crawling and walking.

Impact on Development:

• Cognitive: Retention can contribute to difficulty concentrating due to physical discomfort and sensory sensitivities.
• Physical: May cause poor posture, fidgeting, and bedwetting beyond the expected age.
• Social-Emotional: Can create challenges in classroom settings where sitting still for long periods is expected.

Retained Reflexes into Adulthood

When these reflexes persist beyond childhood, they can manifest in various ways:

• ATNR: Difficulty with coordination, chronic tension, or challenges in sports and driving.
• Moro: Anxiety, hypersensitivity, and exaggerated stress responses.
• Spinal Galant: Chronic fidgeting, lower back pain, and discomfort with tight clothing.

These lingering reflexes can contribute to challenges in daily life, particularly in neurodivergent individuals who may already experience sensory processing differences.

Neurodivergent-Affirming Occupational Therapy for Reflex Integration

Traditional approaches to reflex integration often focus on standard exercises and structured interventions. However, neurodivergent-affirming occupational therapy respects individual differences and seeks to create supportive environments rather than forcing conformity.

Affirming Approaches Include:

• Sensory-Friendly Movement: Encouraging natural movements like swimming, yoga, and dance to integrate reflexes in a non-restrictive way.
• Emotional Regulation Strategies: Providing tools to manage stress, such as deep pressure input, music, and personalized sensory breaks.
• Accommodations Instead of “Fixing”: Recognizing that some retained reflexes may not need to be eliminated but instead accommodated to support function and comfort.
• Empowerment and Autonomy: Allowing individuals to explore movement at their own pace rather than imposing rigid exercises.

Final Thoughts

Understanding and addressing primitive reflex retention is an essential part of supporting children’s cognitive, physical, and emotional development. A neurodivergent-affirming approach acknowledges that movement and sensory processing needs vary from person to person. Rather than focusing solely on integration, the goal should be to create supportive environments where children and adults can thrive on their own terms.

By embracing movement, regulation, and accommodation strategies that respect each individual’s needs, occupational therapy can become a truly inclusive and affirming practice.