スマホ脳

• Reading: スマホのう
• Romaji: sumaho nou
• Kanji breakdown: 脳 (brain) — スマホ is a loanword abbreviation of スマートフォン (smartphone)
• Pronunciation: /su.ma.ho noɯ/

Meaning

Smartphone brain — cognitive and psychological effects from excessive phone use, popularised by the Swedish book that became a bestseller in Japan.

スマホ脳 (literally 'smartphone brain') entered mainstream Japanese vocabulary following the massive success of Swedish psychiatrist Anders Hansen's book 「スマホ脳」, published in Japanese in 2021. The book argued that smartphones are re-wiring our brains in harmful ways — reducing attention spans, increasing anxiety, and disrupting sleep. It sold over 1.5 million copies in Japan alone, making スマホ脳 a household concept. The term is now used both to refer to the book's central thesis and more loosely to describe anyone who seems addicted to or cognitively impaired by their phone.

Examples

1. スマホ脳読んで怖くなってスクリーンタイム制限かけた。 I read 'Smartphone Brain' and got so freaked out I set a screen time limit.
2. 最近集中力なくてスマホ脳かもって思ってる。 My concentration has been terrible lately — I'm starting to think I have smartphone brain.
3. 子供にスマホ渡す前にスマホ脳読んでほしい。 I wish parents would read 'Smartphone Brain' before handing a phone to their kid.

Usage Guide

Context: health, parenting, digital wellness, education

Tone: concerned, reflective

Do Say

• スマホ脳って本当にあるんだって、集中力がどんどん落ちるらしい。 (Smartphone brain is apparently real — it says your concentration keeps declining.)
• スマホ脳対策で寝る一時間前からスマホ見るのやめた。 (To combat smartphone brain, I stopped looking at my phone an hour before bed.)

Don't Say

• 「スマホ依存」と「スマホ脳」を完全に同じ意味で使う (Using スマホ依存 and スマホ脳 interchangeably — スマホ依存 means addiction/dependency, while スマホ脳 refers specifically to the neurological and cognitive effects described in Hansen's framework)

Common Mistakes

• Assuming スマホ脳 is an established medical diagnosis — it is a popular science concept, not a clinical term
• Pronouncing 脳 as のう with a falling tone — it should be の↑う↓ in standard Tokyo pitch accent

Origin & History

Directly derived from the Japanese title of Anders Hansen's 2020 Swedish book 'Skärmhjärnan,' translated as「スマホ脳」by Shinchosha in 2021. スマホ (smartphone) + 脳 (brain). The book's extraordinary success in Japan — driven partly by TV appearances and social media discussion — made the compound term enter everyday usage beyond the book itself.

Cultural Context

Era: Popularised 2021 following Japanese book release

Generation: All ages; especially discussed by parents and educators

Social background: Universal

Regional notes: Used nationwide. The book's success was particularly notable in Japan compared to other markets, reflecting cultural anxiety around screen time in children.