Browsing Brage NIH by Author "Stergiou, Nicholas"
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Filtering affects the calculation of the largest Lyapunov exponent
Raffalt, Peter Christian; Senderling, Benjamin; Stergiou, Nicholas (Peer reviewed; Journal article, 2020)The calculation of the largest Lyapunov exponent (LyE) requires the reconstruction of the time series in an N-dimensional state space. For this, the time delay (Tau) and embedding dimension (EmD) are estimated using the ... -
Inter-limb coupling in individuals with transtibial amputation during bilateral stance is direction dependent
Raffalt, Peter Christian; Kent, Jenny A.; Stergiou, Nicholas (Peer reviewed; Journal article, 2021)We investigated the control of upright standing in individuals with unilateral transtibial amputation (TTA) by assessing the inter-limb coupling and the coupling between the center of pressure beneath both limbs combined ... -
The temporal pattern and the probability distribution of visual cueing can alter the structure of stride-to-stride variability
Raffalt, Peter Christian; Stergiou, Nicholas; Sommerfeld, Joel H.; Likens, Aaron D. (Peer reviewed; Journal article, 2021)The structure of the stride-to-stride time intervals during paced walking can be altered by the temporal pattern of the pacing cues, however, it is unknown if an altered probability distribution of these cues could also ... -
To walk or to run - a question of movement attractor stability
Raffalt, Peter Christian; Kent, Jenny A.; Wurdeman, Shane R.; Stergiou, Nicholas (Peer reviewed; Journal article, 2020)During locomotion, humans change gait mode between walking and running as locomotion speed is either increased or decreased. Dynamical systems theory predicts that the self-organization of coordinated motor behaviors ...