A. Selective Adaptation: Orientation tuning •Now present a vertical bar again. •Population firing will be skewed towards non-fatigued neurons. Results in perception of tilt aftereffect Preferred orientation of cell A. Selective Adaptation: Orientation B. Selective Adaptation: Contrast sensitivity •A vertical grating modulated by contrast and by spatial frequency. Visible spatial frequencies depend on contrast. B. Selective Adaptation: The contrast sensitivity function
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4/15/2013 4 B. Selective Adaptation: Contrast sensitivity The contrast sensitivity function is determined by the sensitivity of spatial frequency tuned neurons to different contrast levels. V1 neurons are these spatial frequency filters. B. Selective Adaptation: Contrast sensitivity•Gratings of higher contrast drive neurons with that orientation selectivity more. •Contrast sensitivity is a different measurement of how well we see than acuity. How well you can tell two things that are similar in color/brightness apart Method for Selective AdaptationB. Selective Adaptation: Contrast sensitivity