Coupling/locking relations between components.

<p>Phase synchrony and Granger causality between the three components. Asterisks (*) denote statistically significant normal-patient group pairs (student’s <i>t</i>-test, <i>p</i> < 0.05). Compared with the normal group, phase synchrony is stronger while Granger causality is weaker in the patient group which indicates ‘locked’ relations between the components in patients.</p><p>Coupling/locking relations between components.