The discrimination task was administered twice to two groups of participants who were matched for age and gender. Each evaluation lasted approximately 5 min. all participants, including those in the control group, were blindfolded at the time of the evaluation. After the first test of discrimination, participants waited 90 min during which one group of participants (n = 32) retained visually deprived, while the other group (n = 32) had their blindfolds removed. During this interval, participants were asked to view or listen to a movie. Participants were kept alert by the examiner who remained in the room. Participants’ thresholds were measured again immediately after this 90-min interval (posttest). No feedback about the correctness of the responses was giving to participants at any time