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This is Scientific American 60-Second Mind, I'm Christie Nicholson.Got a minute?

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Pain is an immediate attention getter.

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And when we're in pain, we think we know the exact location of the source of that pain, for example, your knee or your back.

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But our ability to pinpoint pain varies across the body, and in a specific pattern.

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Scientists created stinglike discomfort on the surfaces of volunteers¡¯ bodies using two lasers.

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They measured the minimum distance between the two pain points where the volunteer could still distinguish between the two stings.

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And they found that this capacity to discern different pain points, called spatial acuity, improves as we move towards the center of our bodies.

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For example, we're better at detecting the two pain points on the shoulders than at the wrists.

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The scientists also tested our acuity for touch, assuming it might be similar to pain.

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While we tend to have an equal ability to detect touch and pain, scientists found that our acuity for simple touch decreases towards the center of the body.

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So in this case it's harder for us to detect non-painful touch at our shoulders than at our wrists.

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The exception to this rule of thumb, if you will, is our fingers.

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The digits are sensitive to both pain and touch.

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But it's not because fingers have more nerve fibers.

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The researchers think it might be a question of information processing.

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Because we use our fingers constantly, we're more practiced at sensing them.

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Whether they're playing the piano, or hammering a nail.

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Thanks for the minute, for Scientific American 60-Second Mind.I'm Christie Nicholson.

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