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When observing preschoolers complete complex motor tasks, you may observe an increase in motor activation displayed as extraneous movements in body parts not actively involved in the current task.  These extraneous movements are sometimes called motor overflow, mirror movements or associated movements.

Perceptual and Motor Skills published research examining what is associated with motor overflow in preschool children.  The study participants included 476 preschool children (average age: 3.88 years).  Three assessments were completed on each preschooler.  Contralateral associated movements (motor overflow)were measured with the Zurich

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