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Actually, it works just fine.

We can measure a stutterer in hundreds of different ways: body temperature, heart rate, blood pressure, red and white blood-cell count, cat scan, MRI, you name it.

We can even measure how many times he stutters, on what words, under what circumstances, what time of day, what he's eaten, how much coffee he's had, whether he's stressed or not.

The point is, while all of these observations and measurements (including the things actual researchers are actually looking at) can tell us a lot about the stutterer, none has revealed what makes him stutter.

All analogies have flaws, but this one holds up pretty well.

I once spent the better part of a year breadboarding over two dozen headphone amplifier designs--some purloined, some of my own confection--in search of a circuit I could live with.

Every last one of them had essentially perfect frequency response and exquisitely low distortion and noise according to my measurements.

Yet they all sounded different, and some sounded awful.

Now, with my limited equipment I can't measure all the fancy things we can measure today, so perhaps there's a measurement lurking out there somewhere that would explain the audible differences between these circuits. But at the same time, even a full suite of amplifier measurements doesn't seem to explain differences we hear.

I look forward to the day when we will be able to find the measurement(s) that explain why amps sound different, just as I look forward to the day when science can find the cause of my stuttering, and my son's, and perhaps find a remedy.

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