40 healthy individuals (20 women and 20 men) with normal or corrected-to-normal vision volunteered for this study. All participants were strictly right-handed as assessed by the Edinburgh Inventory [43] and had a strong right-eye dominance (as attested by practical tests, such as looking inside a bottle or alternately closing each eye to evaluate parallax entity). They were of similar age (average = 33.7 years) and socio-cultural status. Experiments were conducted with the understanding and the written consent of each participant and in accordance with ethical standards (Helsinki, 1964). The study was approved by the CNR Ethical Committee.
