Asymmetrical Tonic Reflex

The asymmetrical tonic reflex (ATNR) is a primitive reflex in infants. In order to elicit a correct response, the infant starts in the supine, lying on back, position. Once in position, the infant's head is turned to the side. The normal response is displayed by same side arm and leg extension.¹

Normally the ATNR weakens and then becomes extinct after an infant reaches six months. A retained ATNR has developmental consequences as a child grows. In infancy, actions such as rolling over and crawling become difficult. In childhood, persistent ATNR prevents actions that cross the midline of the body. Retained ATNR is often associated with dyslexia and ADHD.²

^{Certain exercises may be performed to help alleviate the strength of the reflex as seen below.}

https://www.youtube.com/watch?v=XzHRVy-t2Z0

1. Haywood, K., & Getchell, N. (2009). Life span motor development. Champaign, IL: Human Kinetics.

2. ATNR - Occupational Therapy for Children. (n.d.). Retrieved August 02, 2016, from http://occupationaltherapyforchildren.over-blog.com/article-atnr-105923600.html