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. Author manuscript; available in PMC: 2013 Jul 1.
Published in final edited form as: Atten Percept Psychophys. 2009 Nov;71(8):1782–1792. doi: 10.3758/APP.71.8.1782

Figure 4.

Figure 4

Result for perceived spatial frequency tasks. Top row: Psychometric functions for the simultaneous task (A, in Experiment 3) and delayed (VSTM) task (D, in Experiment 4). Each function shows proportion of trials on which observers chose the test Gabor as having a higher spatial frequency than the standard Gabor. The horizontal line at .5 proportion correct shows chance performance, and the vertical dashed lines indicate for each location the point of subjective equality (PSE), at which the test and standard were equally likely to be reported as having higher spatial frequency. Middle row: Averaged point of subjective equality (PSE) along the horizontal meridian (E&W) and the vertical meridian (N&S) for Experiment 3 (B), and Experiment 4 (E). Bottom row: Scatterplots of individual observers’ PSEs when the test stimulus was presented along the vertical meridian (N&S) versus the horizontal meridian (E&W) for Experiment 3 (C) and Experiment 4 (F). Asterisks indicate a statistically significant difference (*p < .05). Error bars represent the standard error of the mean across the observers.