Fig. 2From: Correlation of balance posturographic parameters during quiet standing with the berg balance scale in patients with parkinson’s diseasePSD analysis diagram of a sample PD patient’s COP signal at the EO state: (A) in the ML direction; (B) in the AP direction. PSD = Power Spectral Density, ML = medial-lateral, AP = anterior-posterior, x = ML, y = AP.Back to article page