Paradigms.

<p>A) Match to sample task (MST). Subjects responded “yes” by button press if two numbers matched. B) Addition Task (AT). Subjects responded “yes” if the number in parentheses matched the sum of the numbers presented on screen. C) Visual Serial Attention Task (VSAT). Subjects responded “yes” if the sum of the number on screen and the number from the previous screen matched the number in parentheses.</p>