A tug-of-war is revealed in the response of the eye to blue light, with implications for the study of light sensitivity and seasonal depression.
The research is in PNAS. (full open access)
Research: “Opponent melanopsin and S-cone signals in the human pupillary light response” by Manuel Spitschan, Sandeep Jain, David H. Brainard, and Geoffrey K. Aguirre in PNAS. doi:10.1073/pnas.1400942111
Image: Drs. Aguirre and Brainard and graduate student Spitschan found that melanopsin, a protein and short wave-sensitive S-cones, both in the retina have opposite effects and compete for control of the pupil in response to blue light. Credit University of Pennsylvania.