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1 .This is Scientific American 60-Second Mind, I'm Christie Nicholson.Got a minute?
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2 .Pain is an immediate attention getter.
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3 .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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4 .But our ability to pinpoint pain varies across the body, and in a specific pattern.
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5 .Scientists created stinglike discomfort on the surfaces of volunteers¡¯ bodies using two lasers.
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6 .They measured the minimum distance between the two pain points where the volunteer could still distinguish between the two stings.
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7 .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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8 .For example, we're better at detecting the two pain points on the shoulders than at the wrists.
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9 .The scientists also tested our acuity for touch, assuming it might be similar to pain.
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10 .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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11 .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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12 .The exception to this rule of thumb, if you will, is our fingers.
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13 .The digits are sensitive to both pain and touch.
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14 .But it's not because fingers have more nerve fibers.
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15 .The researchers think it might be a question of information processing.
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16 .Because we use our fingers constantly, we're more practiced at sensing them.
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17 .Whether they're playing the piano, or hammering a nail.
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18 .Thanks for the minute, for Scientific American 60-Second Mind.I'm Christie Nicholson.
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