Muscle Tension and Power of Suggestion - This is a party trick that always amazes people, but it is based on science.
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These experiments are from Robert Krampf - The Happy Scientist
This week's experiment is something that we used do for fun when I was a kid.
(No jokes about dinosaurs or the Dark Ages, please.) It was back in the
days before Gameboys and the internet. Back in the days when there were
only 4 TV channels and you had to get up and turn the dial on the TV to
change the channel. Even so, we still had lots of fun. This is a party
trick that always amazes people, but it is based on science. To try it, you
will need:
a doorway
OK, it is really very simple. Stand in the doorway. Start with your arms
hanging down by your sides. Lift them outwards until the backs of your
hands are touching the doorframe on each side of you. Now press outwards
with your arms, as hard as you can. Keep pressing while you count to 60, or
as long as you can without it hurting. Then take one step forward and relax
your arms. Your arms will seem to rise upwards all by themselves.
What is going on? Two things are working together to make this happen.
The first is muscle tension. If you tense a muscle until it gets tired, it
will keep some of that tension even after your brain stops sending it a
signal to push. You can try that by making a fist and squeezing it as tight
as you can for about a minute. Then if you slowly open your hand, you can
feel the muscle tension that is still trying to keep your hand closed.
This muscle tension by itself is not enough to explain what happens to your
arms. The other part of the experiment involves suggestion. An important
part of this trick is telling the person that is trying it what will happen.
Because they are expecting it to happen and they are prepared for it, as
soon as they feel the muscle tension lifting their arms, they unconsciously
help.
Try testing the experiment with several people that do not know what to
expect. They may still get some arm raising from the muscle tension, but
you will probably find that you get a much stronger response from someone
that has been told what to expect.
We have done experiments on suggestion before. (Remember when we saw that
just thinking about your nose itching could make it itch? If you did not
get that experiment, try to go for 5 minutes without scratching your nose.)
This experiment is another example of how the mind and the body work
together, sometimes in ways that we do not realize. For example, just
saying the words "ice cream" over and over can cause my body to go to the
freezer for a snack, all on its own.
Have a fantastic week.
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