Proprioception sounds like a pretty complex idea, but students will get it right away if you start with the 'finger to nose test'. This well-known exercise simply requires the test taker to close their eyes and touch the tip of their nose with the tip of their finger (or to touch their pointer fingers together). The video below includes links that will allow you to watch three videos on the topic of Proprioception (mouse over the time stamp to see additional videos).
Right click to copy the link to this video.
After you've shown the videos, you might want to post this question:
This question should result in lots of head scratching. Most students will immediately rule out the sense of smell, taste and hearing and will also discount sense of sight because their eyes were shut during the test. If sense of touch is offered as an answer, tell your students that it can't be sense of touch because they were not actually touching anything at the start of the test.
The answer is that it's proprioception, the process by which sense detectors in our muscles and inner ear tell the brain where our body is in space, which in turn allows us to control our limbs without directly looking at them.
The Man Who Lost His Body
If during all this you get the idea that some students are saying to themselves, "So what? Why is this important anyway?", make sure to watch the third video (about 30 seconds into the video above) about the case of Ian Waterman. He is among only ten people in the world known to have lost the ability to co-ordinate any kind of movement unconsciously.
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