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Science 27 October 1967:
Vol. 158. no. 3800, pp. 469 - 471
DOI: 10.1126/science.158.3800.469
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Articles

Ragnar Granit

Floyd Ratliff 1

1 Rockefeller University, New York 10021

If it shall be demanded, then, when a man begins to have any ideas? I think the true answer is, when he first has any sensation. For since there appear not to be any ideas in the mind before the senses have conveyed any in, I conceive that ideas in the understanding are coeval with sensation. . . .

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Science. ISSN 0036-8075 (print), 1095-9203 (online)