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I liked this sentence: Low resting heart rate (RHR) has been viewed either as an indicator of a chronically low level of psychological arousal, which may lead some people to seek stimulating experiences, or as a marker of weakened responses to aversive and stressful stimuli, which can lead to fearless behavior and risk taking.
Almost related news item: AP posted a story today about a Connecticut family suing Children's Hospital in Boston for distress resulting from a medical diagnosis that then caused the state of Massachusetts to take custody of their 17 year old daughter.
This: The daughter was diagnosed with a [genetic] mitochondrial disorder affecting cellular respiration. The family sought a second opinion. Second opinion? Psychiatric illness.