Clinical Tests for Primitive Reflexes and the CPRIMS Scale
Biological purposes, triggers, and clinical test protocols of Moro, ATNR, STNR, Spinal Galant, Babinski, Palmar, and Rooting/Sucking reflexes, alongside the psychometric validity of the 2025 CPRIMS scale.
Primitive Reflexes and Clinical Test Protocols
Many studies have shown that children with ADHD exhibit a significantly higher rate of unintegrated primitive reflexes compared to their neurotypical peers. Several behavioral symptoms—such as hyperactivity, impulsivity, and inattention—often result from involuntary physical and sensory reactions triggered by these retained reflexes.
The list below outlines the clinical characteristics, test protocols, and ADHD behavioral phenotype expressions of the seven primary primitive reflexes associated with ADHD:
1. Moro Reflex (MR)
**Biological Purpose:** Early defense and startle response; stimulates the sympathetic nervous system and initiates the first breath at birth. Present at birth, it normally integrates between 2 and 6 months.
**Clinical Test Protocol:** The child is placed in a supine position or seated. Support under the head is suddenly and slightly dropped backward to simulate a gravity change.
**Trigger Stimulus:** Sudden noise, bright light, change in gravity, or unexpected tactile contact.
**ADHD and Clinical Expressions:** Constant "fight-or-flight" state, chronic anxiety, sensory hypersensitivity (light/sound), high distractibility, impulsivity, and emotional dysregulation.
2. Asymmetrical Tonic Neck Reflex (ATNR)
**Biological Purpose:** Assists passage through the birth canal; initiates early hand-eye coordination. Starts at 18 gestations, integrates between 5 and 9 months.
**Clinical Test Protocol:** The child is placed in a quadruped (on hands and knees) or standing position. The head is slowly and fully rotated to one shoulder and held for 10 seconds.
**Trigger Stimulus:** Active or passive lateral rotation of the head.
**ADHD and Clinical Expressions:** Involuntary locking of the elbow when writing, difficulty crossing the midline, eye tracking deficits, line skipping during reading, and poor motor coordination.
3. Symmetrical Tonic Neck Reflex (STNR)
**Biological Purpose:** Prepares the infant for crawling by lifting the body against gravity. Appears at 6–9 months, integrates between 9 and 11 months.
**Clinical Test Protocol:** In a quadruped position, the child's head is slowly moved to maximum flexion (down between the legs) and then to maximum extension (up toward the ceiling).
**Trigger Stimulus:** Flexion (bending) or extension (lifting) of the head along the vertical axis.
**ADHD and Clinical Expressions:** Inability to sit upright at a desk, constant slumping or fidgeting in chairs, "ape-like" walking style, and difficulties with visual accommodation when switching focus from a board to a notebook.
4. Spinal Galant Reflex (SGR)
**Biological Purpose:** Facilitates birth through lateral hip movements. Appears at 20 weeks in utero, integrates between 3 and 9 months.
**Clinical Test Protocol:** While the child is on hands and knees, a firm line is drawn down one side of the spine along the lumbar region using a finger or small brush.
**Trigger Stimulus:** Tactile and pressure stimulation to the paramedian area of the back.
**ADHD and Clinical Expressions:** Inability to lean back against a chair, excessive fidgeting, poor attention span, discomfort with tight clothing around the waist, and late-onset enuresis (bedwetting).
5. Babinski Reflex
**Biological Purpose:** Facilitates sensory development of the sole of the foot prior to walking. Present at birth, replaced by the plantar reflex as the child begins walking.
**Clinical Test Protocol:** A firm object is stroked in a curved line from the heel upward and across the metatarsal pad.
**Trigger Stimulus:** Deep tactile and proprioceptive stimulation to the sole of the foot.
**ADHD and Clinical Expressions:** Balance issues, clumsiness, improper gait, poor ankle coordination. Asymmetric reactions raise suspicion of corticospinal tract developmental delay.
6. Palmar Grasp Reflex
**Biological Purpose:** Develops early grasping, holding, and exploration behaviors. Starts at 16 gestations, integrates between 3 and 6 months.
**Clinical Test Protocol:** The child's palm is stroked or pressed lightly along the lifeline toward the wrist.
**Trigger Stimulus:** Local tactile or proprioceptive contact in the palm.
**ADHD and Clinical Expressions:** Excessive pencil gripping pressure, weak fine motor skills, failure to develop a mature pincer grasp, rapid hand fatigue during writing, and involuntary finger twitching.
7. Rooting and Sucking Reflexes
**Biological Purpose:** Facilitates locating the breast and feeding. Fully active at birth, integrates around 4 months as voluntary eating coordination develops.
**Clinical Test Protocol:** A brush or finger is stroked outward three times from the corner of the mouth to the cheek; the lips are lightly pressed.
**Trigger Stimulus:** Tactile stimulation around the mouth, cheeks, and lips.
**ADHD and Clinical Expressions:** Speech articulation deficits, difficulty chewing or swallowing solid foods, hypersensitivity around the mouth, and involuntary chewing or facial movements.
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Clinical Measurement Methods and Psychometric Analysis of the CPRIMS Scale
A variety of assessment tools have historically been used to detect retained primitive reflexes in developmental screenings. The INPP test battery, developed by Sally Goddard Blythe, has long been considered the gold standard for measuring neuromotor immaturity and dysfunction in the vestibulo-spinal and vestibulo-ocular pathways. However, behavioral questionnaires based on parent or teacher observations (e.g., the Bender-Purdue Reflex Test) contain significant validity and reliability limits as they measure indirect behavioral phenomena rather than direct physical actions.
To bridge this standardization gap, a new diagnostic scale was developed in 2025: the Children's Primitive Reflex Integration Measurement Scale (CPRIMS).
Validated on a sample of 555 children aged 7–8 in Shenyang, China, the scale consists of 17 items that rate each reflex from "0 = Absent (Integrated)" to "3 = Strong/Pathological."
The structural properties and CFA fit indexes of the CPRIMS scale are:
Structural Validity: Consists of 7 sub-scales: Moro, ATNR, STNR, TLR, Spinal Galant, Spinal Perez, and Landau reflexes.
Total Variance Explained: The sub-scales explain 88.2% of the total variance.
Reliability (Cronbach's α): Alpha coefficients for the sub-scales range from 0.730 to 0.945.
CFA Fit Indexes: $\chi^2/\text{df} = 1.631$, $\text{RMSEA} = 0.044$, $\text{NFI} = 0.950$, $\text{CFI} = 0.980$, $\text{IFI} = 0.932$, $\text{TLI} = 0.972$.
The CFA fit parameters confirm that the CPRIMS scale is a highly valid, reliable, and standardized tool for assessing primitive reflex integration levels globally.