Proprioception

We are often told that we have five senses, but that’s not really correct. What about your sense of balance? Even though balance is created in the inner ear, it has nothing to do with hearing. There are more than five senses, and proprioception is a sense that we do not often think about or consider a perception.

vitruvian-manThe word “Proprioception” come from Latin proprius, meaning “one’s own”, “individual”, and capio, capere, to take or grasp, is the sense of the relative position of neighboring parts of the body and strength of effort being employed in movement.

In medicine, it is defined as “the ability to sense stimuli arising within the body regarding position, motion, and equilibrium.” Proprioception lets you know where your body is, how it is oriented, and how it is moving.

To be clear, proprioception depends in part on touch/feeling, but it also may include your sense of balance for equilibrium/positioning. But it also includes information from other parts of the body.

This “body orientation” is also “provided by proprioceptors (muscle spindles) in skeletal striated muscles and tendons (Golgi tendon organ) and the fibrous capsules in joints. It is distinguished from exteroception, by which one perceives the outside world, and interception, by which one perceives pain, hunger, etc., and the movement of internal organs.”

“The brain integrates information from proprioception and from the vestibular system into its overall sense of body position, movement, and acceleration. The word kinesthesia or kinæsthesia (kinesthetic sense) strictly means movement sense, but has been used inconsistently to refer either to proprioception alone or to the brain’s integration of proprioceptive and vestibular inputs.”

To put it simply, we know where are body is and how to control it. We can touch our nose if we have our eyes closed, we can walk fairly well if we are blindfolded, we know our body position when we wake up in the morning, and often even when we are asleep, even sleep walking. And we even know our body position when we are weightless or when a limb is numb (or asleep). Think also about repetitive movement like typing or assembly line work – you can usually tell the moment our hands or fingers are “off” target even a little.

Now, we don’t really think about most of our senses until we lose one, and it is possible to lose proprioception from contracting Multiple Sclerosis, a spinal cord injury or tumor, or even a virus, just as a man named Ian did. his story is demonstrated in Andrew Dawson’s 2011 TEDMED talk. There’s also a documentary about Ian called The Man who lost his body.

It is interesting to note that Ian was not paralyzed, but nerve damage kept him from feeling his body and required that he look at his body to determine and control what it was doing.

One more interesting bit of evidence that suggests that proprioception is much more than just feeling: Phantom Limb syndrome – the sensation experienced by someone who has had a limb amputated, but still feels that the limb is present. A 2009 study suggest that this syndrome may be caused by proprioceptive memory. The brain still perceiving the lost limb is a perfect example of our minds constructing reality.

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