Did you ever have a spooky encounter that made you wonder if it was really a ghost? According to experts, most "ghostly" experiences can be explained by natural phenomena, hallucinations, or false memories. Professor Christopher French, a skeptic who studies the science of the paranormal, suggests that these encounters are often sincere misinterpretations of things with natural explanations. He notes that our brains are prone to missing things and misremembering events, which can lead us to jump to conclusions about an ambiguous experience.

Source: https://www.livescience.com/human-behavior/conspiracies-paranormal/whats-the-scientific-explanation-for-ghost-encounters