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. 2018 Aug 29;18(9):2856. doi: 10.3390/s18092856

Figure 2.

Figure 2

Experimental paradigm of one session used in the main experiment. In the beginning of each session, a rest period of 10 s is performed. The string ‘ABC’ and an asterisk are presented to indicate a rest period and the subject is asked to fix the eyes to the asterisk to minimize ocular movement. After the rest period, either mental arithmetic (MA) or light cognitive (LC) task is randomly performed. For MA, a pair of a three-digit number and a single-digit number between 5 and 9 is randomly presented, and the subject is asked to sequentially subtract the single-digit number from the three-digit number (e.g., 477 − 8) for 10 s. For LC, the string ‘ABC’ is presented, and the subject is asked to internally imagine vocalization of the English alphabet from A to Z with a 1 Hz speed for 10 s. Both MA and LC are performed ten times in each session, and each subject completes five sessions (50 MA and 50 LC in total). A short beep (300 ms) is presented at every screen transition (red speaker icons).