Perception or estimation of one's heartbeat. A mental tracking score can depend on timing, beliefs about ordinary heart rate and response strategy as well as sensitivity to actual cardiac signals; such a score is not automatically a pure measure of interoceptive accuracy.[ref]
Heart-beat perception, panic/somatic symptoms and anxiety sensitivity in children by Thalia C. Eley and others. Behaviour Research and Therapy 42, 439–448; 79 children aged 8–11, mental tracking and symptom/sensitivity measures
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