Figure 1.

Diagram of the working memory task showing the event order and trial types. Three categories of trials, defined by the type of distracters presented during the delay interval, were involved. Each trial contained two distracters of the same type, which were consecutively presented for 3 s. Subjects were instructed to encode and maintain the memoranda into working memory, look at the distracters, and then indicate by pressing a response button whether the probes were part of the memoranda (1, yes; 2, no).