if an individual has ideal posture. COP excursion and velocity are indicators of control over COG and are key factors for identifying proper posture and the ability to maintain balance. COP excursion is defined by Collins & De Luca (1992) as the Euclidean*LINK* displacement in the anterior/posterior and medial/lateral directions within the base of support (perimeter around the feet). With poor posture and / or exaggerated spinal curvatures it is possible that the COP excursion would increase which can cause instability as the COP shifts towards the perimeter of the base of support. Types of tests The test protocols usually include a Sensory Organization Test (SOT), Limits of Stability Test (LOS), a Motor Control Test (MCT) and an Adaptation Test (ADT). The SOT test was developed by Nashner and is a computerized system that is made up of dual movable force plates and movable visual screen (EquiTest). During the test the patient is instructed to stand still and quietly with eyes open or closed depending on which of the six tests is being administered. The patient performs multiple trials per test; a description of these tests can be found in the table below. The SOT test is based on the fact that there are three sensory systems mainly involved in maintaining balance (vision, vestibular, and proprioceptive). Minute spontaneous body sways are measured as well as reactions provoked by unexpected abrupt movements of the platform and the visual surroundings. Differences in these sways and reactions to system perturbations help to determine the patients ability to effectively use visual, vestibular, and proprioceptive input to maintain posture. Wrisley et al. (2007) found that there are learning effects associated with the SOT test and therefore it could be used clinically to assess, improve and track changes in balance. SOT results are subdivided in an Equilibrium Score, a Sensory Analysis, a Strategy Analysis and COG Alignment. The sensory analysis calculates 4 different scores: somatosensory (SOM), visual (VIS), vestibular (VEST) and visual preference (PREF) (otherwise known as "visual dependence", an excessive reliance on visual information even when it is inappropriate). The scores are respectively calculated as ratios of the 6 different scores of the equilibrium score: MCT results include instead the Weight Symmetry, both for forward and for backward translations, Latency Scores for forward and backward translations, and Amplitude Scaling, which refers to the capacity of the participant to generate a response force adequate to the