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I was looking at a row of candy bars in a vending machine today. Later on, I found another vending machine in the same building. Most of the bars were the same, but I immediately noticed that one was different.

If I had to list the names of the bars, I would have a lot of difficulty remembering all of them. I also would not be able to say which of the original bars was missing. But they must all be stored somewhere in my memory, because a different bar stood out at once.

Is there a name for this phenomenon in cognitive science? The idea that humans can forget the details of information, but are still able to tell when a new piece of information is different. Perhaps it had some early evolutionary advantage?

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closed as off-topic by Seanny123, queenslug, AliceD, Arnon Weinberg, Robin Kramer Nov 21 '16 at 7:33

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Is there a name for this phenomenon in cognitive science?

What you are describing is a number of things that in general have to do with attention and memory.

The first one of them is priming. Memory can be both conscious and unconscious, or declarative and implicit, and attended vs unattended. I've always found the names a bit confusing, but in short there is a lot of information that your brain stores without you being in the know. The priming bit comes from experiments where sets of words were presented to test subjects as part of a context, that is they were not part of the main activity or focus, and later when tested for another set of words that included those same first words, the subjects scored higher on recognizing them. An advertising billboard on the highway or street is designed to take advantage of priming.

The second thing at play here is what's called pop-out search ( Treisman & Gelade ,1980). When a target of a visual search can be identified by a single feature such as color, it pops-out, in the image below, how long does it take you to find the special K ?

So, back to the candy bar example: by staring longingly into the first vending machine, you primed yourself with candy bars unknowingly, and upon encountering a second one, your undirected visual search immediately noticed the one that was different from the first set.

enter image description here

Perhaps it had some early evolutionary advantage?

I believe it could, imagine you live in the savanah so something like this might be your day to day, you are familiar with it, yet if a lion or other predator were to be in the mix, this popout search + familiarity would help you spot it.

enter image description here

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