What does it mean that note-taking as information processing?

Taking notes while reading or listening forces active processing.

Example: You read a 4,000-word article on decision fatigue. Without notes, you finish it and retain a vague sense that 'decisions are tiring.' With notes, you pause after each section to write one sentence capturing the core claim in your own words: 'Baumeister's ego depletion model says self-control draws from a finite pool — but replication failures suggest beliefs about depletion may matter more than actual depletion.' That sentence required you to compare claims, resolve an ambiguity, and compress the argument into a structure you can reuse. The note is not a record of what you read. It is evidence that you processed it.

Try this: Choose something you would normally read passively — an article, a book chapter, a podcast transcript. Read or listen to it in segments of roughly 500 words or 3 minutes. After each segment, close the source and write one to three sentences capturing the core idea in your own words. Do not copy phrases from the source. Do not summarize — transform. Ask yourself: What is the author actually claiming? What would change if this claim were wrong? How does this connect to something I already know? After finishing the full piece, review your notes and write a single paragraph synthesizing the main argument. Compare that paragraph to what you would have remembered without notes. The gap between those two is the processing dividend.