consider a few other memory situation. when you are at a party and you are introduced to someone, you often find it very difficult to recall that person's name, even a very short time later. compare that to remembering a teacher's name from your elementary school. you can probably name most of your teachers with little difficulty. consider also a situation when you were shown how to serve a tennis ball for the first time. when you tried it, you found that you had some difficulty remembering all the things that you were supposed to do to perform a successful serve. that situation differs quite drastically from how well you can hop onto a bicycle, ever after you have not been on one for many years,and ride it down the street.