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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Neurobiol Learn Mem. 2010 Sep 24;95(2):145–151. doi: 10.1016/j.nlm.2010.09.010

Figure 3.

Figure 3

A perceptual learning task using the external noise paradigm. (A) Spatial layout of the task, including the peripheral orientation discrimination Gabor stimulus, and a central letter stimulus for a secondary task. (B) Contrast threshold (Gabor signal contrast corresponding to the criterion accuracy) as a function of the external noise in the stimulus. Threshold is a systematic function of criterion, external noise, and practice (data from Dosher & Lu, 1998). (C) Examples of a signal of constant contrast embedded in increasing amounts of external noise.