EEGs were recorded throughout the experiment while subjects watched faces on a computer screen and responded through a 5-key response box, using both index fingers regardless of task. Faces were not repeated in the gender and emotion blocks to prevent repeated exposure effects, i.e. each face was new and presented once only. Subjects were presented with 180 faces in three blocks of 60 trials each, there were 30 each of male and female, and 10 each of sad, neutral and happy expressions in each block. In the first block the subject was instructed to identify which faces were female and which were male by pressing the 1 or 2 button, respectively. In the second block the subject was presented again with male and female faces showing happy, neutral, or sad emotions. The subject was asked to identify the emotion by pressing a corresponding button (1, 2, or 3). Accuracy was assessed after 5 practice trials at the beginning of each block and the practice trials were repeated if the subject responded incorrectly. In the third block, the memory section, subjects
