To study which hues are associated with brief excitations of foveal middle-wavelength(M)cones, two highly practiced color-normal observers(the authors)gave basic color names to 500 and 530 nm increments. The test spots were presented to the fovea and foveola in conditions that included M-cone isolation. 1°and 3.6 min arc tests were flashed for 200 ms on steady 8.6', 1°, or 10°mono- on mixtures of these fields, or on a dark field. Test were flashed at 1,2,4, and 8×thresholds.
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