Bottom-up and top-down influences at untrained conditions determine perceptual learning specificity and transfer.

is reported only for the data presented in Figure 1 and not the other Figures, and no transfer index is reported for the spatial experiments; c) many non-pairwise t-tests were performed (non-parametric tests would probably be more appropriate) without correction for multiple comparisons – most were highly significant, but this procedure should still be implemented; and d) Do any of the statistical tests take into account the uncertainty in the estimates of the various values measured per subject (e.g., the error bars apparent in the dim points in Figure 1a, d, f , etc.)? 4) In the CSF experiments, the authors mention that the subjects were 'neither told nor aware of' the untrained stimuli in the non-dominant eye (NDE).

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