We’ve all heard the oft-repeated phrase: “Seeing is believing” – as if our human senses (specifically that of sight) are somehow, magically infallible. Of course, most people don’t want to admit just how fallible our senses can be – or, more to the point, most people aren’t willing to admit just how fallible their own senses can be (they’re more likely to admit that other people’s senses aren’t up to snuff).
As anyone who has experience with court cases & law enforcement can tell you, the least reliable kind of evidence is typically that of eyewitness testimony, because we tend to place an over-reliance upon our senses in place of other, more rational & consistent forms of evidence. Not only that, but our tendency to over-emphasize the trustworthiness of our senses can lead us into fooling ourselves that we’re seeing ghosts, alien spacecraft, the Virgin Mary in a grill cheese sandwich, and similar deceptions.
A dumbfounding study roughly a decade ago that many now find hard to believe revealed that if people are asked to focus on a video of other people passing basketballs, about half of watchers missed a person in a gorilla suit walking in and out of the scene thumping its chest.
Now research delving further into this effect shows that people who know that such a surprising event is likely to occur are no better at noticing other unforeseen events – and may even be worse at noticing them – than others who aren’t expecting the unexpected.