Last week was NeuroDay 2012 at Yale, an in-house retreat for the neuroscience department where we listen to talks and have neurocentric fun for a day. This year’s NeuroDay was heavy on visual perception talks, which I found fascinating, and so I will be talking a bit about vision. This is an image of rods and cones from the retina. Rods and cones are the first step of visual processing. They essentially detect light as it hits the back of your eye. Different photoreceptors (rods and types of cones) detect different wavelengths of light. Rods are considered to be good for night vision (not too significant for bright light or color), which cones do color vision and more detailed images (especially in the fovea where they are found in very high concentrations). In this image, you can see a lot of rods and a couple of cones- hopefully it’s obvious which is which since they are named for their shape!