Can someone link me something that shows that attention spans are decreasing?

I looked into it briefly and the following two is what I found. The rest seemed to just be repeating or debunking these two claims.

1. An infographic that claims we went from 15 second attention spans to 8 seconds attention spans (as opposed to a goldfish having a 9 second attention span (how was this measured?)).

This seems BS.

2. A study that measured how long knowledge workers spent on a single screen. This dropped from 250 seconds in the early 2000s to 72 seconds in 2012 and 47 seconds more recently.

This data shows something, but I think connecting this to attention spans 1:1 doesn't seem quite right. It could just as well be that people work differently now. Eg they're more likely to pull information from another screen or document than they used to be.

> I looked into it briefly

Your attention span is quite short.