Crossing the Midline

Crossing the midline is spontaneously reaching a hand, foot, or eye across the body’s imaginary center line to act on the opposite side. It is usually established by around age three to four, alongside a dominant hand. Difficulty with it is one observation occupational therapists use within a broader bilateral-coordination assessment.

This is a short glossary definition. For signs, causes, research, and how therapy can help, see the complete guide to crossing the midline. Browse more terms in the DrSensory glossary.