Teachers urged to focus on cognitive load to unlock student learning
Teachers need to understand that young people can only think about a limited number of things at once – and new national teaching standards now require it.
Recent updates from the Australian Institute for Teaching and School Leadership place stronger emphasis on how the brain learns, including the role of “cognitive load”.
CQUniversity’s Professor Ken Purnell, an expert in Educational Neuroscience, says the change reflects growing evidence that managing students’ mental workload is essential.
“Too often, when students struggle, we assume it’s about ability or motivation,” Professor Purnell said. “But sometimes the issue is much simpler – their brains are overloaded.”
The brain isn’t a hard drive
Professor Purnell says the brain doesn’t function like a computer that can store endless information.
“It’s more like a small workbench,” he said. “You can only fit a few tools on it at one time. If too many things pile up, tools fall off the edge.”
This limited space is known as working memory, and when it becomes overloaded, learning declines.
Productive vs unproductive effort
Some mental effort is essential for learning. But unnecessary effort, such as cluttered slides, unclear instructions or distracting classrooms, adds strain without helping.
“Good teaching isn’t about making learning easy,” Professor Purnell said. “It’s about removing clutter while keeping the productive challenge.”
The right level of challenge
Professor Purnell compares learning to strength training.
“If the weights are too heavy, you get injured. If they’re too light, you don’t grow. Learning works the same way.”
Clear explanations and worked examples early on, followed by a gradual reduction in support, help build expertise.
Emotions shape learning
Cognitive load is also affected by students’ emotional state. Fatigue, anxiety or social exclusion reduce the mental space available for learning.
“Belonging isn’t a ‘nice extra’,” Professor Purnell said. “A calm, supportive classroom literally creates more space for thinking.”
Small strategies, big impact
Effective cognitive‑load management doesn’t require costly programs. Evidence‑based strategies teachers can use include:
- Breaking lessons into manageable steps
- Pairing visuals with spoken explanations
- Highlighting key ideas
- Spacing practice over time
- Mixing problem types
- Using retrieval practice instead of re‑reading.
“These are small design choices,” Professor Purnell said. “But collectively, they protect working memory and strengthen long‑term retention.”
Why cognitive load matters now
Professor Purnell says the updated teaching standards reinforce the need to design learning with cognitive limits in mind.
“This isn’t about memorising brain anatomy,” he said. “It’s about recognising that when students struggle, the answer isn’t to add more explanation – it’s to redesign the learning experience.”
“The students haven’t changed. The curriculum hasn’t changed. What changes is how deliberately teachers manage the limited mental space students bring to every lesson.
“And when we do that well, we teach smarter.”
