"Attention levels" refers to how focused or concentrated someone is on a particular task or information. It indicates the amount of mental effort and concentration someone is giving to pay attention to something. Full definition
Dark chocolate containing 60 percent or more cacao had the most dramatic effect on attention levels. (inc.com)
Learning how to think about children's behaviors and attention levels from the standpoint of values and priorities was a real eye - opener. (playtherapycolorado.com)
Think of those shifting headlines as an index of the planet's attention levels rising and falling in sync with the sun. (discovermagazine.com)