Postural stability measurements in upright stance (25.6 s. duration).

For 15 and 12 control adolescents and for the 27 subjects together. Means and standard errors of surface of CoP, standard deviations of lateral (SDx) and of anteroposterior (SDy) body sway, variance of speed, PII, and PI and CI for each plane (respectively PIy, PIx, CIy and CIx) for each frequency bands (0.05–0.50 Hz, 0.50–1.50 Hz and 1.50–10.00 Hz) for each condition i.e. the quiet fixation task (FT), the Stroop interference test (SIT) and the Stroop flexibility test (SFT).