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Journal of Vision
BACKGROUND RESEARCH HYPOTHESIS METHODS RESULTS CONCLUSIONS The authors thank the NIH for its financial support for this study under grant R01 EY002934. Images: 256 x 256 gray scale (8 bits) images subtending about 11º (Max Planck Institute face database) Low-pass filter: The images were blurred using a 50 th order FIR (Finite Impulse Response) low-pass spatial-frequency filter. The filter function is:doi:10.1167/8.6.898 fatcat:2beenesnhfccfk5q6vnqpmjjka