Symmetrical Tonic Neck Reflex STNR

Onset: 4-6 months

Stimulus:  Head position, flexion or extension

Response: When head is in flexion, arms are flexed and legs are extended; when head is in extension, arms are extended and legs are flexed.

Integration: 8-12 months

Negative Effects if Persistent:
Ability to prop the body on the arms in prone position
Crawling reciprocally
Sitting balance when looking around
Attaining and maintaining hands and knees position
Use of hands when looking at the object in hands ( in sitting)

Source:  Dreeben page 421