A high level of norepinephrine (adrenaline) is often associated with high levels of brain arousal, shyness, low sensory thresholds, and blue eyes. Higher levels may be due to direct genetic influences or to stress-related activities (e.g., norepinephrine lowers the threshold of reaction in the amygdalae). (Ornstein, Robert, PhD. The Roots of the Self. p 40-45. NY: HarperCollins, 1995.)

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