👉 Human experimentation involving CDs (compact discs) did not typically involve direct biological or psychological manipulation, but sometimes it was used as a medium to disseminate propaganda or misinformation by altering sound recordings in ways that could influence public opinion or behavior. In a few cases, researchers explored the effects of music or audio stimuli on human subjects, particularly in studying auditory perception and memory, though these were not experiments per se and did not involve direct experimentation with human subjects beyond controlled listening environments.
