N-back 數字記憶訓練
目前數字和 N 步前一樣嗎？——經典工作記憶訓練範式。
🎯 目前數字與 N 步之前相同時，點「匹配」
🎯 心裡複述最近 N 個數字 · 命中 +1、誤報 -1 · 正確率 ≥85% 升 N · 進度自動保存
What Is N-back?
N-back is the most famous working memory paradigm in cognitive science: digits appear one by one, and you tap MATCH whenever the current digit equals the one N steps earlier. For a 2-back, the sequence 7…4…7 means the second 7 is a match — you must continuously update and rehearse the last two digits while comparing and deciding. That simultaneous store-and-process load is exactly what working memory is, and it's among the strongest components of fluid intelligence.
How to Play & Adaptive Difficulty
- 24 digits per round, each shown for about 2 seconds; roughly 7 of them match the digit N steps back.
- Scoring: each hit +1, each false alarm (matching a non-target) −1; misses don't deduct but count against accuracy.
- Adaptive N: ≥85% accuracy raises N (up to 4-back), below 55% lowers it (floor 2-back); your current N and best N are saved automatically.
Working-memory Training Tips
- Rehearse out loud: beginners can whisper the last N digits (7, 4… 7, 4) before switching to silent rehearsal.
- Trust the rhythm: each digit has a fixed window — hesitation hurts more than the occasional slip.
- Don't rush N: get comfortably above 85% on 2-back before chasing 3-back; overreaching invites frustration.
- Full workout: pair it with Stroop inhibition and Task Switching to cover all three executive functions — see the Prefrontal Training collection.
The Working Memory Benchmark
N-back began as a research instrument: psychologist Wayne Kirchner introduced it in 1958 to study how aging affects short-term memory, and it became a cornerstone paradigm of working-memory research. The task is deceptively small — a stream of stimuli, one simple question: is this the same as the one N steps back? At 1-back your mind merely holds the previous item; at 2-back it must juggle a rolling window of the last two, updating constantly as each new item slides the window along.
It earned pop-culture fame in the 2000s when training studies suggested possible benefits to fluid intelligence, sparking a scientific debate that is still, honestly, unsettled. What is not contested: N-back is one of the most demanding and measurable working-memory workouts ever devised. The adaptive difficulty means you always train right at your current ceiling, and the level you can sustain is a plain, honest number that tends to creep upward with steady practice.
常見問題
What does N-back train?
Working memory — holding information in mind while simultaneously updating and processing it. Supported by the prefrontal and parietal networks, it is one of the three core executive functions and is deeply involved in reasoning, comprehension and mental math.
What do 2-back and 3-back mean?
N is how far back you compare: 2-back asks whether the digit matches the one two steps ago, 3-back three steps ago. Each +1 in N substantially raises the memory load.
Can N-back really make me smarter?
Studies show N-back practice reliably improves the trained task and closely related working-memory tasks. Treat it as brain fitness — a few minutes daily with a moderate challenge beats chasing miracles.
Does the difficulty adjust itself?
Yes. Finish a round at ≥85% accuracy and N goes up; drop below 55% and it eases back down, keeping training in the productive struggle zone. Your progress is stored locally in your browser.
What level of N-back should I aim for?
Most adults find 2-back genuinely demanding at first and can reach it comfortably with practice; a sustained 3-back is a strong result that dedicated players work up to over weeks. The adaptive difficulty means the right level is always the one you are at — the task does the calibrating for you.
How often should I train N-back, and for how long?
Short, frequent sessions beat marathon ones: ten to twenty minutes a day is the typical research-style routine, with a day of rest when performance slides. The task is unusually sensitive to fatigue and mood — a bad session after a sleepless night is information about your sleep, not your memory.