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Two-alternative forced-choice (2AFC) perceptual discrimination test

EM Eugenio Manassero
FS Federica Scarpina
ST Sofia Tagini
GC Giulia Concina
MS Massimo Scacchi
AP Antonella Pollo
AM Alessandro Mauro
BS Benedetto Sacchetti
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Following the recognition task, participants’ ability to discriminate the CS from the NSs was tested. 7 pairs of auditory stimuli (i.e. CS vs NS1, NS1 vs CS, CS vs NS2, NS2 vs CS, CS vs CS, NS1 vs NS1, NS2 vs NS2) with a 1000-ms intra-pair-interval were presented in a random sequence (ITI randomly ranging between 21 and 27 s). For each pair, subjects judged whether the two tones were “the same tone or different tones”, and provided a confidence rating on an analog scale from 0 (completely unsure) to 10 (completely sure). During the entire task, the fixation cross was shown on the screen. No feedback was furnished.

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