highly significantp < 0.001
Conversely, the correlation between each individual’s learning slope and mean threshold value on day 1 of learning was highly significant ( r = −0.91, p < 0.001), which indicates that those who showed a steep learning function (slower learners) started off with a high threshold, whereas those with a flatter learning curve (faster learners) were already close to ceiling performance on the first day of training, as may be seen in Figure 4 .