Working Memory: The Small Space Where Learning Happens
Reflections from my doctoral journey in the Science of Learning - August 3, 2026
One of the biggest surprises of beginning my doctoral studies has been discovering just how much learning depends on something we can't even see. As teachers, we spend countless hours planning lessons, selecting materials, and designing instruction, yet we rarely stop to think about the tiny mental workspace where all learning begins. We ask students to listen to directions, decode unfamiliar words, remember spelling patterns, organize their thoughts, ignore distractions, and make sense of new ideas, often all at the same time. It's easy to assume that if students are struggling, they simply need more practice or greater effort. The more I study cognitive science, however, the more I realize that another explanation often exists. Sometimes the problem isn't motivation or ability. Sometimes the brain is simply trying to do too much at once.
Memory researcher Bennett Schwartz describes working memory as the brain's mental workspace, a temporary system that holds and manipulates information while we think, solve problems, and learn. Unlike long-term memory, working memory has an incredibly limited capacity. Once that limited space becomes overloaded, learning becomes significantly more difficult. Reading about working memory fundamentally changed how I think about classroom instruction because it shifted my attention away from what students were doing wrong and toward the demands I was asking their brains to manage.
As a reading specialist, I see this every day. Imagine a student encountering an unfamiliar multisyllabic word. While trying to decode it, the student must remember letter-sound correspondences, blend phonemes together, hold the beginning of the word in memory while processing the end, monitor whether the word makes sense, and continue remembering what happened in the sentence. If handwriting is still effortful, additional attention is devoted to forming letters, spacing words, and controlling the pencil. None of these tasks are unimportant, but together they place enormous demands on a mental system with very little capacity. When students become overwhelmed, it isn't necessarily because they aren't capable. Their working memory has simply reached its limit.
This idea naturally led me to Cognitive Load Theory, which has become one of the most influential frameworks I've encountered in my doctoral studies. Rather than asking how we can make learning easier, Cognitive Load Theory encourages teachers to think carefully about where students' mental effort is being spent. Some learning is inherently complex. Learning to decode an unfamiliar multisyllabic word or understand a new mathematical concept requires effort, and no amount of instructional design can eliminate that challenge. This is what researchers refer to as intrinsic cognitive load, the mental effort that comes from the complexity of the learning itself.
What teachers can influence, however, is the unnecessary mental effort created by the way instruction is designed. Long directions, cluttered worksheets, distracting visuals, or asking students to coordinate multiple strategies simultaneously all consume valuable working memory without directly contributing to learning. Cognitive Load Theory refers to this as extraneous cognitive load, and reducing it may be one of the simplest ways teachers can improve instruction without lowering expectations.
One of the most valuable lessons I've taken from studying cognitive science is that effective instruction isn't about making learning easier, it is about making learning more efficient. Students should absolutely wrestle with meaningful ideas. Productive struggle is an important part of learning. But they shouldn't have to waste precious mental energy navigating unnecessary obstacles that have little to do with the learning goal itself. Every instructional decision we make either supports working memory or competes with it.
As I continue my doctoral journey, I find myself asking a different question when I plan lessons or reflect on my instruction. Instead of wondering why students are struggling, I ask, Where is their working memory being spent? That single question has changed the way I think about teaching. It reminds me that every child arrives in the classroom with the same cognitive bottleneck, and one of our greatest responsibilities as educators is to ensure that the limited space in working memory is devoted to the thinking that matters most.
References
Dehaene, S. (2020). How We Learn: Why Brains Learn Better Than Any Machine... for Now. Viking.
Schwartz, B. L. (2026). Memory: Foundations and Applications (5th ed.). SAGE.
