while listening to your aging instructor, you are also trying to look at the overheads and take notes. this is an example of

divided attention

Explanation:

Divided attention is a high skill when you perform do two or more tasks at the same time and need attention to perform two or all tasks. it mean you are not fully focused on work, but on different things, because you are divided into anything. When people have to do more than one task at a time, performance on at least one task often declines. It is generally accepted that humans have a limited capacity to process information. When multiple tasks must be performed at the same time, the demand for the tasks may exceed the processing capacity.

Yes, they are always very triggered