Learning science reveals how memory, attention, and cognition interact to create durable knowledge. Rooted in decades of cognitive psychology research, these evidence-based techniques optimize encoding, storage, and retrieval — the three pillars of effective learning. Modern study strategies leverage insights about spacing effects, retrieval practice, and metacognitive awareness to transform how knowledge is acquired and retained. Understanding the mechanisms behind these approaches helps learners move beyond inefficient habits like rereading and highlighting, replacing passive review with active engagement. The key insight: learning requires effortful processing that feels challenging but produces long-term gains that passive methods cannot match.
What This Cheat Sheet Covers
This topic spans 14 focused tables and 92 indexed concepts. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.
Table 1: Spaced Repetition and Memory Consolidation
Forgetting isn't a bug — it's the default, and the only reliable countermeasure is timing. These techniques all exploit the same finding: that revisiting material just as it starts to slip cements it far more durably than reviewing it while it's still fresh. From Ebbinghaus's decay curve to the algorithms inside Anki, the rows here trace how spacing your reviews — and sleeping between them — turns fragile short-term traces into knowledge that sticks.
| Technique | Example | Description |
|---|---|---|
Review material after 1 day, 3 days, 7 days, 14 days | • Distributing study sessions over time rather than cramming • dramatically improves long-term retention compared to massed practice | |
Memory retention drops 40% after 20 minutes, 50% after 1 hour, 70% after 24 hours | • Hermann Ebbinghaus discovered that memories decay exponentially without reinforcement • each spaced review flattens the curve. | |
Studying 1 hour per day for 5 days vs 5 hours in one session | • Spreading learning over multiple sessions • superior to cramming for both immediate and delayed recall | |
SM-2 algorithm: review after 1, 6, 24, 96, 360 days | • Algorithmically determined intervals that balance forgetting and consolidation • used in systems like Anki and SuperMemo. |