The power of suggestion is when a person believes something or behaves in a certain way due to being influenced by someone else's suggestion or expectation, or by environmental cues. It plays a significant role in the paranormal world because it can shape what people think they see, hear, or feel during experiences of hauntings and other psychic phenomena.

The power of suggestion shares similarities with confirmation bias and the expectancy effect. All three involve the influence of preconceived notions on perception and interpretation. While confirmation bias and the expectancy effect are more about internal cognitive processes shaping how information is interpreted and perceived, the power of suggestion involves external cues and comments influencing someone's perceptions.

The power of suggestion comes into play when someone mentions that others have seen a ghostly figure in the corner of a particular room. Your mind might start looking for that figure. The suggestion has primed...