Why We Forget

"Memories, pressed between the pages of my mind
Memories, sweetened thru the ages just like wine,
Memories, memories, sweet memories" - Elvis song

As much as we want to remember things, it appears that the brain is really designed for being forgetful and unobservant. The opposite condition, perfect recall, can in fact be overwhelming and a detriment to survival. Many Idiot Savants have amazing gifts of memory but at the cost of being autistic. And so evolution favors forgetting.

The flaws in our memories and observations are detailed in a book I’m enjoying called, “Why We Make Mistakes: How We Look Without Seeing, Forget Things in Seconds, and Are All Pretty Sure We Are Way Above Average” by Joseph T. Hallinan. Here are some of the anecdotes from just the first CD:

• A researcher made a film where a man walked into an empty classroom and sat down. The scene cut to a close-up of him, seated, looking around. What most viewers failed to notice was that a different actor was used for the close-up shot.
• The human eye has a very small zone on the retina for detailed vision. The vast majority of what we see is peripheral. We are fooled into thinking we have great vision because the eye is rapidly moving about taking three shots a second that get stitched together in the brain as one image.
• This means that a lot of detail about us is not observed – the brains fills in the gaps with what we expect to see.
• This trait works against us when it’s our job to find the rare occurrence: a radiologist looking for tumors on an X-ray or an Airport Security guard looking for gun as the luggage is scanned. They miss on average 25-30% of the items they are trained to look for. The brain has a built-in quitting threshold that makes the snap judgment all is normal and there is nothing interesting to see.

It turns out there is a lot we don’t know about memory and recall. My brother-in-law is working with lab mice in an attempt to locate where memories are formed in the brain and to physically detect the brain change where a memory is stored.

Bottom Line

While the facts above may be interesting (and clutter the brain) of what use are they?

It turns out that most of the time, what we do and what we see are subconscious. We walk, drive, eat, etc. on autopilot as we focus on a conversation or a phone call. Those tasks we do under autopilot make a very fleeting imprint on the brain and are soon forgotten.

A common example of this is forgetting where you left your keys. You walk in the house (autopilot) while thinking about the kids or the bathroom and set down your keys on the first empty space you pass. Then you forget about the keys because there are other more important things to think about.

The solution to this is to make your key dropping habit a conscious act.

1. Try to pick one location you always use.
2. When you don’t use that location, then pause one second as you set down the keys to visualize yourself where you are standing in the house, look attentively at the surface where you are placing the keys, and make up a story like “I’m putting my keys on the dining table because I need to run to the bathroom.” This should be a deeper impression on the brain and aid in recall.