The last time I was in a lecture was on a Danube cruise over two years ago. A few facts made it into my short-term memory but nothing stuck in my long-term memory. If I'd taken notes, I'd have remembered the information over a longer period.
I don't know if this relates directly to the information processing model or not.
There are at least three processes needed here. The first is attending, paying attention. The second is getting the information into long-term memory (LTM). The third is retrieving the material from LTM.
Here are some sources that may be helpful in "increasing your learning potential":
Although all of these suggestions may not apply, most of them should be helpful. Thanks for asking.