Infrasound—noise below the range of typical human hearing—from power, heating and mechanical systems within buildings can make people feel irritated and induce a stress response, according to a new study April 28, 2026 11:44 a.m. Undetectable infrasound might explain why some people report paranormal experiences, a new study suggests. Aire Images via Getty Images The world is filled with sounds below the range of typical human hearing. These invisible noises, known as infrasound, can even come from within your home, stemming from old pipes, ventilation systems and air conditioning. Even though we can’t usually hear these noises, they can put us in an uneasy state of mind and induce a stress response, according to a study published April 26 in the journal  Frontiers in Behavioral Neuroscience . The findings might explain why old houses can feel spooky, leading some people to think they’re haunted.…