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The human body is bilateral, and the sensory organs of eyes and ears function best when accessing the midfield where left and right sensory input overlap, providing a supportive whole-body context for one-sided activities and allowing the two sides to work together instead of inhibiting one to access the other. Consider that children today engage in few activities, besides walking, running, or swimming, that emphasize alternating bilateral motion. Yet they take part in many activities that are one-sided. The one-sided activities, such as handwriting or using scissors, are important for developing dexterity and specialized skills, yet the use of one side at the expense of the other is quite different from the use of one side while resourcing both.

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