1900 Planck introduces quantum concept. 1903 Piper's law. 1905 Einstein's photon theory. 1910 Minkowski demonstrates point to point projection onto striate area in dogs via behavioral methods. Stigler describes ....contrast. 1911 Gullstrand invents the slit lamp. 1912 Wertheimer's studies of apparent motion. 1913 Abney's law. Minkowski demonstrates separate laminar terminations of left and right optic nerve fibers in lateral geniculate nucleus. 1918 Holmes presents first map of striate cortical projection of the visual field in man. 1920 First anatomical demonstration of point to point projection of retina onto lateral geniculate nucleus (Minkowski, Brouwer and Zeeman). 1922 First application of Fourier analysis to flicker sensitivity (Ives). 1924 First C. I. E. photopic luminosity function. 1925 Holm demonstrates that vitamin A deficiency causes night blindness. 1927 First recording of electrical activity in optic nerve (Adrian and Matthews) 1929 Berger discovers alpha component of the EEG. 1929 First electrical stimulation of human visual cortex tFoerster and Penfield). 1931 C. I. E. standardizes colorimetry (Guild-Wright primaries). First measurement of rhodopsin regeneration in vivo (Tansley) 1932 First recording of electrical activity in single optic nerve fibers (in limulus; Hartline and Graham). 1933 Stiles and Crawford demonstrate directional sensitivity of cones. Wald finds vitamin A in rhodopsin. First electronically amplified human ERG (Cooper, Creed, and Granit) 1935 Osterberg: First cell count of rods and cones in human retina. LeGrand measures visual acuity bypassing the optics of the eye. 1939 Stiles introduces Pi mechanism analysis of increment thresholds. 1941 First mapping of the cortical projection of the retina based on electrical responses (Talbot and Marshall). 1942 Hecht, Schlarr, and Pirenne show that rods respond to single quanta. 1943 DeVries-Rose law. 1947 Granit distinguishes sustained and transient ganglion cells. 1948 Gabor describes principles of holography. Rose introduces the concept of detection quantum efficiency 1949 Transient VEP first reported by C. C. Evans 1951 C. I. E. standardizes scotopic luminosity function. 1952 First electrical recording from individual mammalian retinal ganglion cells: Discovery of antagonistic center-surround organization of receptive fields (Kuffler). First demonstration of disappearance of stabilized retinal images (Ditchburn and Ginsborg; Riggs, Ratcliff, Cornsweet and Cornsweet). 1953 First recording from horizontal cells (Svaetichin's S potential). 1954 First psychophysical demonstration of rod saturation (Aguilar and Stiles). Peterson, Birdsall and Fox present the theory of signal detectability. Tanner and Swets apply the theory of signal detectability to human sensation. 1955 Photoreversal (Hagins, Hubbard, and Kropf). Jameson and Hurvich use hue cancellation to infer opponent color codes. First study of rhodopsin regeneration in living human retina by ophthalmic densitometry by Rushton, Campbell, Hagins, and Brindley. Rushton demonstrates light induced changes in human cone pigments; identifies chlorolabe and erythrolabe. Flament makes the first measurement of the line-spread function of the human eye. Kanizsa describes subjective contours. 1956 First measurement of human spatial modulation transfer function by Schade. Barlow demonstrates the existence of dark light at absolute threshold. 1957 Reichardt presents an autocorrelation model for motion detection. 1959 Land's color demonstrations. First electrical recording from individual visual cortical neurons; discovery of simple, complex, hypercomplex receptive fields by Hubel and Weisel. Lettvin, Maturana, McCullogh and Pitt examine feature detectors in the frog visual system. 1960 Publication of first random dot stereogram by Julesz. Sperling uses partial report to measure iconic memory.