Figure 1.

Experimental setup: children sat in front of a computer monitor in a darkened room, hands resting on a table. Supported postural condition included hip straps that keep the pelvis aligned vertically and a rigid support around the thoracic spine ~ 1 inch below arm pit. The straps were released and support bar removed for the unsupported condition. Magnetic sensors were attached to a headband and to the index finger of dominant hand.