behavioral and neurological AE posture abnormal AE 10036436 JX, YH a behavioral and neurological AE that refers to rigid body movements and chronic abnormal positions of the body. This symptom is not the same as showing poor posture or slumping over. Rather, it is often the result of a serious spinal cord or brain injury. WEB: http://www.healthline.com/symptom/posture-abnormal