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Cannon, M., Percival, D., Caccia, D., Raymond, G. and Bassingthwaighte, J. (1997) Evaluation scaled windowed variance methods for estimating the hurst coefficient of time series. Physica A, 241, 606-626. doi:10.1016/S0378-4371(97)00252-5

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• TITLE: About the structure of posturography: Sampling duration, parametrization, focus of attention (part II)

  AUTHORS: Patric Schubert, Marietta Kirchner, Dietmar Schmidtbleicher, Christian T. Haas

  KEYWORDS: Center of Pressure; Sample Duration; Posturographic Parameters; Exploratory Factor Analysis; Nonlinear Methods; Dual-Task; Focus of Attention

  JOURNAL NAME: Journal of Biomedical Science and Engineering, Vol.5 No.9, September 19, 2012

  ABSTRACT: There exists a great variety of posturographic parameters which complicates the evaluation of center of pressure (COP) data. Hence, recommendations were given to use a set of complementary parameters to explain most of the variance. However, it is unknown whether a dual task paradigm leads to different parametrization sets. On account of this problem an exploratory factor analysis approach was conducted in a dual task experiment. 16 healthy subjects stood on a force plate performing a posture-cognition dual task (DT, focus of attention on a secondary task) with respect to different sampling durations. The subjects were not aware of being measured in contrast to a baseline task condition (BT, internal focus of attention) in the previously published part I. In compareson to BT a different factor loading pattern appears. In addition, factor loadings are strongly affected by different sampling durations. DT reveals a change of factor loading structure with longer sampling durations compared to BT. Specific recommendations concerning a framework of posturographic parametrization are given.