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(A) Evolution of SNR across trials (mean SNR by blocks of 1000 trials) for each participant, and overall mean SNR (red dotted line). (B) Psychometric function of each participant: detectability index d' (defined as d' = Φ-1 (PH)- Φ-1(PFA) as a function of signal contrast (values calculated on less than 20 observations are not included).
