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Updated: May 8, 2025
Apart from any differences arising from the varying powers of concentration and observation, the stimulus will be the same. But the next step in the process of seeing is the translation of this nerve-stimulus by the brain into a visual image: this can only be done by the awakening of a brain-picture which is already there in short, by recognition.
What purpose does it serve in the animal economy? As to the nature of the light, the principal question is whether it is a direct consequence of the vital activity of the organism in which it is seen, of such a nature that no further explanation can be given of it, any more than we can explain why a muscle is contracted under the influence of a nerve-stimulus; or whether it is due to some chemical process more or less analogous to the burning of a candle.
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