Your brain constructs pain from heart rate signals

Pain is not a direct reflection of tissue damage. The brain continuously predicts what will happen in the body and adjusts pain perception accordingly. This idea is known as interoceptive inference: the brain interprets bodily signals based on prior expectations. The researchers tested whether they could manipulate those expectations by giving participants false information about their own heartbeat before a mild electric shock.

Faster fake heartbeat, more pain perceived

Participants who heard a faster heartbeat (while their actual heart rate was unchanged) experienced the same electric stimulus as more intense and unpleasant. Their real heart rate also decelerated more strongly in anticipation of the pain, a physiological response that occurs when a threat is expected. Both effects largely disappeared in a control condition where the sound was not presented as a bodily signal.

This suggests that the brain does not merely register bodily signals, but actively uses them to align the body’s physical state with the anticipated experience. The brain prepared the body for a pain it had constructed on the basis of false information.

What this means for pain treatment

The findings were published in the journal eLife. They are relevant to chronic pain treatment, where expectations and prior experience play a large role. If the brain partly constructs pain through internal bodily signals, it may also be possible to influence pain via that same route. The researchers flag this as a direction for future research, not a proven therapy.

From a longevity standpoint, a broader implication is notable: bodily signals like heart rate are not neutral carriers of information but are actively interpreted by a brain that models the future. How this system changes with aging remains an open question.

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