The relation of light perception to colour perception / by F.W. Edridge-Green.

  • Edridge-Green, F. W. (Frederick William), 1863-1953.
Date:
1910
Catalogue details

Licence: In copyright

Credit: The relation of light perception to colour perception / by F.W. Edridge-Green. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    Monochromatic patches. Case. Remarks. No. X. Hfj. 1 1 665 498 167 69 Patch of greatest luminosity, A 571—608. 429 Neutral patch, A 4854—5078. 2 1 2 635 503 132 Q Neutral patch, A 4975—5100. 3 4 494 482 415 12 67 3 1 2 3 4 5 6 735 605 534 499 492 482 414 130 71 35 7 10 68 Neutral patch, A 5005—5185. 4 1 2 3 4 5 6 7 775 653 517 506 494 484 473 122 136 11 12 10 11 57 Patch of greatest luminosity, X 587—642. Largest neutral patch, A 504 —515. No defect of light or shade perception. 416 I agreed with all Iris selections. can only perceive a limited number of variations in the spectrum being entirely ignored. The same argument would, however, apply to a two- colour theory, since we can make innumerable variations with only twc variables. A more important argument, however, against the three-coloui theory is to be found in the fact that there is a whole group of cases whicll possess three definite colour sensations and yet are undoubtedly colour-blind These I have called the class of trichromics. Such persons may match the Holmgren wools perfectly, though they may make mistakes in naming single wools. A very frequent mistake when shown a single skein of yellow wool is to call it red or green, while a blue wool they will call green or violet Similar mistakes are made with a lantern. When examined with the spectro- meter, they will name only three colours as against the six named by an ordinary individual. When questioned, they regard the application of a special name of yellow or blue to definite parts of the spectrum as word- splitting, and would regard the words reddish-green or greenish-violet as more appropriate to the parts of the spectrum in question. I give below the details of three trichromic cases as examined by the spectrometer.