title: Observations from unperturbed closed loop systems cannot indicate causality.
authors.forename: H
authors.initials: H
authors.lastname: van der Kooij
authors.forename: F C T
authors.initials: FC
authors.lastname: van der Helm
mesh_terms: D001696:Biomechanical Phenomena; D001330:Electronic Data Processing; D006801:Humans; D009119:Muscle Contraction / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology; D011187:Posture / Q000502:physiology*; D011434:Proprioception / Q000502:physiology*; D013997:Time Factors