Causality detection in cardio-postural interaction under orthostatic stress induced by quiet standing using transfer entropy

2016 ◽  
Author(s):  
Ajay K. Verma ◽  
Amanmeet Garg ◽  
Andrew Blaber ◽  
Reza Fazel-Rezai ◽  
Kouhyar Tavakolian
Keyword(s):  
Transfer Entropy ◽  
Quiet Standing ◽  
Orthostatic Stress

Corticomuscular Coupling Analysis Based on Improved LSTM and Transfer Entropy

2021 ◽  
pp. 136012
Author(s):  
Fei Ye ◽  
Ziyang Sun ◽  
Donghui Yang ◽  
Huijiao Wang ◽  
Xugang Xi
Keyword(s):  
Transfer Entropy ◽  
Coupling Analysis

scholarly journals Response to perturbation during quiet standing resembles delayed state feedback optimized for performance and robustness

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ambrus Zelei ◽  
John Milton ◽  
Gabor Stepan ◽  
Tamas Insperger
Keyword(s):  
State Feedback ◽  
Postural Sway ◽  
Fast Response ◽  
Neural System ◽  
Feedback Mechanism ◽  
Quiet Standing ◽  
Deterministic Models ◽  
Measured Time ◽  
Delayed State Feedback ◽  
Damped Oscillator

AbstractPostural sway is a result of a complex action–reaction feedback mechanism generated by the interplay between the environment, the sensory perception, the neural system and the musculation. Postural oscillations are complex, possibly even chaotic. Therefore fitting deterministic models on measured time signals is ambiguous. Here we analyse the response to large enough perturbations during quiet standing such that the resulting responses can clearly be distinguished from the local postural sway. Measurements show that typical responses very closely resemble those of a critically damped oscillator. The recovery dynamics are modelled by an inverted pendulum subject to delayed state feedback and is described in the space of the control parameters. We hypothesize that the control gains are tuned such that (H1) the response is at the border of oscillatory and nonoscillatory motion similarly to the critically damped oscillator; (H2) the response is the fastest possible; (H3) the response is a result of a combined optimization of fast response and robustness to sensory perturbations. Parameter fitting shows that H1 and H3 are accepted while H2 is rejected. Thus, the responses of human postural balance to “large” perturbations matches a delayed feedback mechanism that is optimized for a combination of performance and robustness.

scholarly journals Efficient computation and statistical assessment of transfer entropy

2015 ◽  
Vol 3 ◽  
Author(s):  
Patrick Boba ◽  
Dominik Bollmann ◽  
Daniel Schoepe ◽  
Nora Wester ◽  
Jan Wiesel ◽  
...  
Keyword(s):  
Transfer Entropy ◽  
Efficient Computation ◽  
Statistical Assessment
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