Attention is a psychological state that selectively points to and focuses on a certain object or activity. attention can be divided into intentional attention and unintentional attention according to whether it is generated and maintained out of conscious intention and effort.
According to the above definition, which of the following description of the students' states belongs to intentional attention?
Professor Huang kept talking on the stage for nearly an hour and a half. He was still not tired. Suddenly, the power was cut off and the microphone was silent. Instead, thousands of students who had been whispering under the stage suddenly quieted down