Working memory
Participants performed the Letters and Numbers test from the Wechsler Adult Intelligence Scale-3 cognitive test battery (WAIS-III; Wechsler, 2006). The test consists of an instructor telling the participant, at a slow rhythm in a loud and clear voice, an alternate sequence of letters and numbers; the participant must first order the block of numbers from least to greatest and then the block of letters in alphabetical order (i.e., if the instructor says “B-5-3,” the participant has to answer “3-5-B”). The test begins with a chain of three elements, to which an additional element is added every three tests. The test ends once the participant has not completed at least one test of the three that form part of each chain. Each test performed correctly is scored with one point.