a The mean CFF threshold in the associated block was higher than in the non-associated block indicates better visual performance. The results in Hz units. b No differences were found in reaction times between conditions. c No significant difference was found in the difference of threshold between the blocks indicate that the starting block did not affect the results. Blue, Associated block; Red, Non-associated block. Error bars indicate the standard error of the mean, and asterisks indicate significant differences between conditions (*p < 0.05).