Abstract
Field trials of the proposed 10°-field observer system (recommended for adoption at the June 1963 CIE meetings in Vienna, Austria, by the Experts of Committee E-1.3.1), which was derived by removing rod response from the colormatching data, indicate that many visual color matches made on existing additive colorimeters require correction for rod response. But even if such corrections are made, additivity failure still may persist. Such additivity failures may result from rod–cone interactions, either inhibitive or facilitative. Additivity checks made by the author are in general agreement with results obtained in the extrafoveal investigations of Wright, of Moreland, and of Clarke; and with the results of the 10°-parafoveal field trials of Wright and Wyszecki, and of Stiles and Wyszecki.
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