Bumping this older thread to the top because I just finished reading
The Invisible Gorilla, Chabris & Simon's full length book about perceptual illusions and the limitations of intuition. This book is awesome and amazing, and if you're at all interested in this stuff (even tangentally), I'd strongly recommend it. It's a fast, enjoyable read with lots of stories to catch your attention and all the meaty-but-boring science bits jammed into copious endnotes that don't interfere with the main point.
Here are a few excerpts that seemed particularly pertinent to several of the responses on this thread. Enjoy!
The Invisible Gorilla by Chabris & Simons said:
In this chapter, when we talk about looking, as in "looking without seeing," we don't mean anything abstract or vague or metaphorical. We literally mean looking right at something. We truly are arguing that directing our eyes at something does not guarantee that we will consciously see it. A skeptic might question whether a subject in the gorilla experminet... actually looked right at the unexpected object or event. To perform these tasks, though (to count the passes, pursue a suspect, or sweep the area for ships), they needed to look right where the unexpected object appeared. It turns out there is a way, in a laboratory situation at least, to measure exactly where on a screen a person fixates their eyes (a technical way of saying "where they are looking") at any moment. This technique, which uses a device called an "eye tracker," can provide a continuous trace showing where and for how long a subject is looking during any period of time -- such as the time of the gorilla video. Sports scientist Daniel Memmert of Heidelberg University ran our gorilla experiment using his eye tracker and found the subjects who failed to notice the gorilla had spent, on average, a full second looking right at it -- the same amount of time as those who did see it!
(The above might be especially interesting to
Enoy21 and a few others.)
Another snippet:
The Invisible Gorilla said:
Our colleague Daniel Levin, a psychology professor at Vanderbilt University, along with Bonnie Angelone of Rowan University, described the gorilla experiment to over one hundred undergraduate students, but without actually showing them the video or asking them to perform the task. After hearing about the experiment, including the appearance of the gorilla--but not hearing about the results--they were asked whether they would have noticed the gorilla if they had participated in the experiment themselves. Fully 90 percent of them predicted they would have seen it. When we originally conducted the study, though, only 50 percent actually did.
That one, of course, will be interesting to everyone who didn't get to see the video but was certain that they themselves would be numbered among the "noticers" and not among the "missers."
The Invisible Gorilla said:
Many people who have experienced the gorilla experiment see it as a sort of intelligence or ability test. The effect is so striking -- and the balance so even between the number who notice and the number who don't -- that people often assume that some important aspect of your personality determines whether or not you notice the gorilla. ... Despite the intuitive appeal of the gorilla video as a Rosetta stone for personality types, there is almost no evidence that individual differences in attention or other abilities affect inattentional blindness.
And that's for everyone patting themselves on the back for their phenomenal brainpower and powers of attention when they spotted the gorilla.
The book goes on to relate several different experiments that explore the question of who notices and
why they notice or don't notice. The jury's still out on that one, but several of the most obvious explanations have been ruled out already ... including the pleasing notion that we can simply
will ourselves to notice the unexpected.
As I said, it's an intriguing book and definitely worth your time if you're interested in knowing more about your mind and how it works -- and about how to improve your chances of noticing the invisible gorillas in your everyday life. There are actually a lot of very persistent and pervasive illusions that affect your decision-making, your understanding of the events around you, and your ability to stay safe in a dangerous world.
pax