I don't know, it's possible for a person to pay no attention to anything. Therefore it isn't always maxed out. Also the "quality" of attention can vary. I think

I don't know, it's possible for a person to pay no attention to anything. Therefore it isn't always maxed out. Also the "quality" of attention can vary. I think the time spent looking at things has increased, but the level of focus and "deep attention" paid to things has likely fallen over time.