Fig. 2
From: BCI inside a virtual reality classroom: a potential training tool for attention
a–c Illustrates three out of the twelve images presented during the attention game, T-SEARCH. The images are shown one at a time with a frequency of five images each second, repeated several times. The subject is asked to locate any blue colored “T” symbol presented in the images. d Represents the image that is displayed at the end of a trial. The subject had to show (in the order of their appearance), which area a blue colored “T” were present