>Isn't that why we take tests in school? Maybe not. I remember (but don't have on hand) that people who studied a novel concept for 1 hour and then were teste

>Isn't that why we take tests in school? Maybe not. I remember (but don't have on hand) that people who studied a novel concept for 1 hour and then were tested on it for 1 hour, without seeing the result of the testing, bettered recalled the content than those who studied it for 2 hours. Granted, lots of variants of such a study should be performed before drawing strong conclusions, but it may be that back propagation isn't much used. >I see a stove eye is black when cold, then when I see it turn red, I touch it. Ow, it hurts. That's supervised learning. Yet most people learn to avoid glowing hot things without having to touch them. I can be told something red that isn't normally red is a danger, and I learn without ever having to touch one and be told my touching it was the wrong course of action. There is also interesting things that happen with sensation vs perception. Ever burn yourself with really hot metal that wasn't glowing? When I did, my fingers perceived extreme cold, not heat. You can also do the reverse by getting a rod made to look like it is glowing hot, chilling it until it is really cold, and hitting someone with it. They'll perceive being burned.