A new Canadian study published in the journal eBioMedicine suggests that long-term effects of COVID-19 may involve lasting changes in the dopamine system of the brain. Researchers compared brain scans of 24 adults with long-term COVID symptoms to those of 24 healthy individuals of similar age and found that people with long-term COVID had approximately 18% fewer dopamine nerve endings than healthy controls. These changes were observed in both MRI and PET scans and were linked to various symptoms including reduced motivation, slower movement, difficulty with memory and word finding, and trouble with daily tasks. The findings suggest that some neurological changes may persist beyond the acute infection phase, even in individuals who have had COVID-19 for over four years. The study also noted that even healthy participants who had previously contracted COVID-19 showed reduced dopamine levels compared to those who had not been infected. While the study was small and cannot be generalized to the entire population, the results provide an objective biological marker for symptoms that are often difficult to diagnose through standard tests. Researchers believe these findings could inform未来的
Bias read (Center): The article presents scientific research without overt ideological framing. It discusses medical findings related to long-term effects of COVID-19 without taking a political stance. While the topic relates to public health, which can be politically sensitive, the article remains focused on the study
Why factuality (85): This article closely follows the primary source document, accurately reporting the study's methodology, results, and implications. It includes key details such as the 18% reduction in dopamine nerve endings, the regions affected (ventral, dorsal, and caudate striatum), and the duration of long COVID
Why objectivity (85): The article remains objective, presenting the study's findings without bias or emotional language. It avoids making value judgments about the severity of long COVID or the effectiveness of current treatments, maintaining a neutral and informative tone.




