3-D Vision for Tiny Eyes in Hasarius adansoni Movie S2

3-D Vision for Tiny Eyes in Hasarius adansoni Movie S2 3-D Vision for Tiny Eyes http://news.sciencemag.org/sciencenow... Jumping Spiders Use Blurry Vision to Catch Quick Prey with Precision [Video] http://blogs.scientificamerican.com/o... Reference A Clearer View from Fuzzy Images Science 27 January 2012: Vol. 335 no. 6067 pp. 409-410 DOI: 10.1126/science.1216887 http://www.sciencemag.org/content/335... •Perspective - Physiology Blurred vision is caused by an image not being focused correctly on the retina. In humans, blurred vision retards our ability to accurately perceive the world, and we go to great lengths to correct unfocused vision. In some spiders, however, images are deliberately defocused on the retina to provide for the crucial depth perception that allows high-precision jumps. On page 469 of this issue, Nagata et al. (1) elegantly demonstrate this novel form of depth perception in jumping spiders through a combination of molecular, electrophysiological, and behavioral experiments. Depth Perception from Image Defocus in a Jumping Spider Science 27 January 2012: Vol. 335 no. 6067 pp. 469-471 DOI: 10.1126/science.1211667 http://www.sciencemag.org/content/335... Abstract The principal eyes of jumping spiders have a unique retina with four tiered photoreceptor layers, on each of which light of different wavelengths is focused by a lens with appreciable chromatic aberration. We found that all photoreceptors in both the deepest and second-deepest layers contain a green-sensitive visual pigment, although green light is only focused on the deepest layer. This mismatch indicates that the second-deepest layer always receives defocused images, which contain depth information of the scene in optical theory. Behavioral experiments revealed that depth perception in the spider was affected by the wavelength of the illuminating light, which affects the amount of defocus in the images resulting from chromatic aberration. Therefore, we propose a depth perception mechanism based on how much the retinal image is defocused. Supporting Online Material Video Movie S1 http://www.sciencemag.org/content/sup... Movie S2 http://www.sciencemag.org/content/sup...