Figure 1
Psychometric 2pd curves of the right index finger of a single participant on day 0 (pre) and day 3 (post1).
The probability that two tips were correctly perceived was plotted against needle distances (red crosses), which was fitted by a sigmoidal function (blue trace). The 2pd threshold was taken from the sigmoidal fit where 50% probability was reached. On day 0, the participant showed a 2pd threshold of 1.68 mm. On day 3, the threshold was lowered to 1.27 mm (an improvement in 2pd performance of 24%).
