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. 2017 Mar 28;7:45363. doi: 10.1038/srep45363

Figure 2. Timing of stimulation and user interface (blue dashed line) for the four psychophysical experiments performed by the subjects.

Figure 2

(A) (Experiment 1): Perception Threshold (PT). Subjects were asked to detect when a stimulus was delivered, discriminating against the null stimulus. (B) (Experiment 2): Sensation Discrimination (SD). Subjects were asked to report which sensation (not perceived, tactile – T –, auditory – A –, or both – T+A) was elicited by each stimulus received. (C) (Experiment 3): Frequency Discrimination (FD). Subjects were asked to report which one of two stimuli was delivered with higher frequency. (D) (Experiment 4): Reaction Time (RT). Subjects were asked to respond to a stimulus as quickly as possible. In RT, the retention interval was set to randomly vary between 1 s and 4 s. In PT, SD and FD the stimuli were 1 s long. In PT and FD the inter-stimulus interval was set to 0.7 s.