CNV time course over parietal sites.

<p>Mean CNV amplitude over lateral parietal electrodes (P3, P4) for successive time windows for the short (A) and long (B) intervals. Bars are standard errors. ERPs elicited by the short (C) and the long (D) intervals and averaged over lateral parietal electrodes (P3, P4).</p

Mean CNV amplitude.

<p>Mean amplitude recorded during AA, AV, VA and AA intervals at fronto-central (F3, F4, Fz, FCz, C3, C4, Cz) (A) and parietal (P3, P4, Pz) (B) sites. Bars are standard errors.</p

Electrophysiological activity recorded during the short interval.

<p>Data collected at prefrontal (FP1, FP2, FPz), fronto-central (F3, F4, Fz, FCz, C3, C4, Cz), parietal (P3, P4, Pz) and occipital electrodes (O1, O2, Oz) are presented.</p

Discrimination levels.

<p>Percentage of correct responses obtained for the AA, AV, VA and VV intervals. Bars are standard errors.</p

Schematic representation of the experimental paradigm.

<p>The task was to discriminate empty intervals delimited by auditory (A) and/or visual (V) signals. In two sessions, the intervals were defined by two signals of the same modality (intramodal intervals: AA or VV) while in the other two, the signals were delivered from different modalities (intermodal intervals: AV or VA). Each trial began with a fixation point (FP), followed by the presentation of an empty interval (ISI= 450 or 550 ms) bounded by auditory and/or visual stimuli (33 ms each) (S1 and S2 = Stimuli 1 and 2). Then, after the presentation of a fixation point (FP), a visual instruction asked the participants to indicate whether the empty interval corresponded to the short or long interval by pressing respectively “1” or “2” on a Serial Response Box.</p

Electrophysiological activity recorded during the long interval.

<p>Data collected at prefrontal (FP1, FP2, FPz), fronto-central (F3, F4, Fz, FCz, C3, C4, Cz), parietal (P3, P4, Pz) and occipital electrodes (O1, O2, Oz) are presented.</p