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New research has shown that chronic pain can be objectively measured using brain signals, a report in The Conversation said. According to the report, a team of researchers conducted a study using brain implants capable of recording neural signals over an extended period. Their aim was to identify reliable markers of chronic pain severity in four patients as they went about their daily lives. While pain is typically a subjective experience, there is still much to discover about how pain signals are processed in the brain. Previous studies often relied on artificial settings, and the relationship between acute and chronic pain circuits remained unclear. To investigate this further, the researchers surgically implanted electrodes in the brains of four patients experiencing post-stroke pain and phantom limb pain. Neural signals were recorded in specific brain regions associated with planning, expectation, and emotion. The patients were then asked to report their pain severity levels multiple times a day for up to six months. Machine learning models were developed to analyse the recorded brain activity signals and predict the patients' self-reported pain intensity scores.