頭の中で

in one's head

→ 頭
phrase Rare #28,975
in one's head Used for something imagined, remembered, or experienced mentally rather than physically. The subject's head is understood from context.
JA: 頭の中で何度も練習しました。
EN: I practiced it in my head many times.

頭の中でだけいつだって聞こえる

I can always hear it, but only in my head.

— 28年後... 白骨の神殿 (2026)

音楽を頭の中で再生してみなさい

Try playing the music in your head.

私は文を書く前に頭の中で整えることにしている

I make a point of organizing my thoughts in my head before writing.

頭の中でお皿動くかも

Maybe the plates in your head are moving?

— TITANE/チタン (2021)