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. Author manuscript; available in PMC: 2013 Jun 4.
Published in final edited form as: J Vis. 2011 Jan 26;11(1):10.1167/11.1.21 21. doi: 10.1167/11.1.21

Figure 5.

Figure 5

Measured 2AFC thresholds compared with predictions from rating scale data for subjects 1 (blue circles), 2 (red triangle) and 4 (purple diamonds). Thresholds were interpolated at 75% seen. Both rod and cone data lie along the line of unit slope, indicating high agreement between measured and predicted thresholds. This demonstrates that the complexity of the rating scale task did not adversely impact thresholds. Data shown for subjects 2 and 4 reflect relative and not absolute thresholds, since absolute stimulus intensity information was not available for these subjects. The prediction of 2AFC thresholds from rating data is described in detail in Sakitt (1972).