Jody Rosenblatt

Current B This conversion sacrifi ces color vision in favor of improved sensitivity in motion detection. Love spot R7s are modifi ed in two main ways: fi rst, they now respond to a broad spectrum instead of narrower ranges of color; and second, they connect to the motion-processing and spatial vision pathways of the brain — to the lamina instead of the medulla. This rewiring of the brain contributes one additional photoreceptor input per ommatidium toward motion processing and should in principle provide additional sensitivity, though perhaps as little as an 8% overall increase. It is possible that this additional sensitivity provides enough of an advantage to male Musca to be worth the loss of color vision across much of the visual fi eld.