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The researchers used online tools to test and verify these predictions by running psychophysics experiments with human participants.

The speed-accuracy tradeoff occurs so often in engineering, psychology and biology, you could almost call it a “law of psychophysics.”

What both fascinated and eluded him, however, was the much more difficult pursuit of “inner psychophysics”—relating the states of the nervous system to the subjective experiences that accompany them.

He knew from his study of psychophysics that she was working against a fundamental biological obstacle.

The founders of psychophysics were the first to treat psychology as an experimental and quantifiable science.