Page "Afterimage" Paragraph 6

" When all wavelengths stimulate the retinal region adapted to green light, the M and L cones contribute less to the resulting percept because their photopigments absorb less light than the S cones.

Thus, trichromatic theory can not explain all afterimage phenomena, indicating the need for an opponent-process theory such as that articulated by Ewald Hering ( 1878 ) and further developed by Hurvich and Jameson ( 1957 ).

Afterimages are the complementary hue of the adapting stimulus and trichromatic theory fails to account for this fact.

" ( David T. Horner, Demonstrations of Color Perception and the Importance of Contours, Handbook for Teaching Introductory Psychology, Volume 2, page 217.

Psychology Press, Texas, 2000 )