Chalk & Talk Desirable difficulties for learning with Elizabeth Bjork and Robert Bjork (Ep 66)
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Mar 6, 2026 Robert Bjork, psychologist and memory researcher known for spacing and retrieval practice; Elizabeth Bjork, cognitive psychologist specializing in memory and applying lab findings to education. They discuss why effortful strategies like retrieval practice, spacing, interleaving, and variation often lead to durable learning. They also explain when difficulties help or hinder learners and how timing and readiness matter.
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Structured Study Groups Beat Unguided Collaboration
- Elizabeth Bjork described study-group experiments where orchestrated collaborative tasks improved final exam performance.
- Groups that engaged in structured retrieval-style activities outperformed students who studied alone weeks later.
Desirable Difficulties Depend On Prior Knowledge
- Desirable difficulties must be calibrated to learner ability to be helpful.
- If students lack background, a difficulty becomes undesirable and hinders learning, not helps.
Test Near The Brink Of Forgetting
- Time retrieval practice so students try to recall when retrieval strength is low but not gone.
- Retrieving at that brink of forgetting boosts storage strength far more than immediate repetition.