FIGURE 1.

Diagram of the delayed match to sample (DMS) task used in the study and time reference for the analyzed event-related potentials (ERP) epoch. Participants were presented with a domino tile, the configuration of which they had to hold in mind for a variable delay (2.5 or 5 s) before identifying it as quickly and accurately as possible from among three different options presented simultaneously at the retrieval stage. The encoding phase, which was the focus of the present study, is highlighted in red. The analyzed ERP epoch extends from 200 ms prior to sample stimulus onset (during warning tone period) to 1000 ms after, coinciding with sample stimulus offset.