Figure 2.

The demonstration of working memory images was used to recognize the state of human mental focus. In the working memory task, a sequence of images was presented one by one on a computer screen. The duration of each image appeared was 1 s. Each subject was instructed to memorize images in the correct order. The three images were presented as question memory images, three other images were used as the response image. This sequence was presented repeatedly. All participants were instructed to identify the correct image in the work memory task.