A physiologic explanation of our findings is that cerebral
processing during dual-task conditions apparently modifies
how the central nervous system controls postural stability.
Under normal conditions, balance is controlled via
integration of sensory information provided by the visual,
vestibular, and somatosensory systems.5,13 Input based on
limb positioning is transmitted to the basal ganglia. This
signal is integrated with planned actions developed in the
premotor cortex and supplementary motor cortex in the
cerebellum. The descending pathway continues via alpha
motor neurons, which innervate skeletal muscle, allowing