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. Author manuscript; available in PMC: 2016 Feb 8.
Published in final edited form as: Vision Res. 1985;25(6):813–820. doi: 10.1016/0042-6989(85)90189-0

Fig. 3.

Fig. 3

Comparison of spatial frequency profiles at 57 cm viewing distance for monkeys (M83-1 and M83-2) and humans (A.W. and B.G.); 50% and 20% hit values are shown. Both monkey profiles fell within the range defined by the human curves. All subjects did best at spatial frequencies of around 0.14–0.65 c/deg, demonstrating both a low and high frequency upturn in threshold.