Standing with eyes closed activated the prefrontal cortex (Brodmann area 8/9). Standing in tandem was accompanied by activation within the visual association cortex, the anterior and posterior vermis as well as within the midbrain.
Compared with the supine posture, standing with feet together activated the cerebellar anterior lobe and the right visual cortex (Brodmann area 18/19), and standing on one foot increased cerebral blood flow in the cerebellar anterior vermis and the posterior lobe lateral cortex ipsilateral to the weight-bearing side. Normal volunteers were instructed to adopt several postures: supine with eyes open toward a target standing with feet together and eyes open or eyes closed and standing on one foot or with two feet in a tandem relationship with eyes open toward the target. We investigated neural substrates for maintaining standing postures in humans using PET with our mobile gantry PET system. The regulatory mechanism of bipedal standing in humans remains to be elucidated.
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