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. 2016 Feb 12;16(3):13. doi: 10.1167/16.3.13

Figure 2.

Figure 2

The effects of TPE training on the transfer of near-threshold orientation discrimination learning to near-threshold contrast discrimination. (a) Stimuli in an orientation discrimination trial. (b) The effects of TPE training on the transfer of near-threshold orientation discrimination learning (nearT_Ori; orientation thresholds indicated by the right ordinate; Symbols and relevant ordinate labels share the same color in Figures 2 and 3) to near-threshold contrast discrimination (nearT_Ctrst; contrast thresholds indicated by the left ordinate). The change of contrast threshold from S1 to S7 indicates the combined effects of near-threshold orientation training, near-threshold contrast pretest, and suprathreshold contrast exposure (supraT_Ctrst). Near-threshold contrast discrimination was further directly trained from S8 to S13. Error bars indicate ±1 standard error of the mean. ΔContrast and ΔOrientation are the threshold-level stimulus differences between the two intervals in a 2IFC trial. (c) Control: The combined effects of near-threshold contrast pretest and suprathreshold contrast exposure, as well as any potential procedure learning, on contrast discrimination threshold. (d) A summary of learning and transfer in (b) and (c). From left: The first two bars indicate the amounts of near-threshold orientation discrimination learning and its transfer to near-threshold contrast discrimination, respectively, after TPE training. The third bar indicates further improvement of near-threshold contrast discrimination through training. The percentage improvement is relative to S7 thresholds. The fourth bar indicates improvement of near-threshold contrast discrimination due to suprathreshold contrast discrimination training in the control condition.