PubMed · 11332791
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M T Stein, I Rapin, D Yapko. 2001. Selective mutism.. https://pubmed.ncbi.nlm.nih.gov/11332791/
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This study examined the differences of heart rate variability measures between children of parents with panic disorder and children of healthy controls using linear as well as nonlinear techniques. Supine and standing heart rate variability indices were measured in all children using power spectral analysis and a measure of chaos, the largest Lyapunov exponent (LLE) of heart rate time series. No significant differences emerged between the children of panic disorder parents and children of normal controls on any of the spectral heart rate variability measures. However, children of patients with panic disorder had significantly lower LLE of heart rate time series in supine posture, suggesting a relative decrease of cardiac vagal function in this group of children. This suggests a possible heritable effect of certain measures of heart rate variability, as previous studies showed decreased heart rate variability in patients with panic disorder using spectral as well as nonlinear techniques. Recent evidence also suggests that some of these nonlinear measures are superior or of additional value to the traditional time and frequency domain measures of heart rate variability to predict serious ventricular arrhythmias and sudden death.
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There is accumulating evidence of a relationship between secure attachment and children's understanding of emotion (Fonagy & Target, 1997; Harris, 1999). The current experiment asked if this relationship is particularly evident when the test of emotion understanding includes attachment-related material or is equally marked on tests with and without attachment-related material. Children ranging from 3-6 years were given a novel test of emotion understanding (the Mother-Infant Separation Test Video) that incorporated provocative attachment themes and also an affectively neutral test of emotion understanding. They performed quite consistently on both types of test-either passing both or failing both. In addition, attachment security, measured concurrently by means of the Separation Anxiety Test, contributed to a correct performance on both tests. This contribution remained when other individual differences were controlled for (age, verbal mental age and gender). Possible explanations of the relationship between attachment and emotion understanding are discussed.