 3. The Arithmetic verification task is a modified version of the task which Tzur and colleagues have used previously Tzur, Berger, Luria, Posner, 2010; Tzur Berger, 2007. The subjects participating in the task will be presented with either correct e.g. 3X618 or incorrect e.g. 3X621 arithmetical equations, and will be asked to decide each trial whether the equation presented is correct or incorrect. This procedure will require approximately 45 minutes. 