Translation guide
The term "social brain" refers to the hypothesis that the human brain evolved to handle complex social interactions. In Japanese, it is typically expressed using the direct translation 社会脳 (shakai nō) in academic contexts, or explained descriptively.
Referring to the scientific concept that primate brains evolved to manage social complexity.
Direct translation used in academic and scientific literature. This is the standard term in Japanese neuroscience.
社会脳仮説は、霊長類の脳の進化を説明する。
The social brain hypothesis explains the evolution of the primate brain.
A slightly more descriptive variant, literally 'social brain'. Less common than 社会脳 but still used.
人間の社会的脳は複雑な人間関係を処理する。
The human social brain processes complex interpersonal relationships.
Talking about the parts of the brain involved in social cognition, empathy, theory of mind, etc.
Same term as above, but used in broader contexts beyond the strict evolutionary hypothesis. Often appears in popular science.
社会脳を鍛えることでコミュニケーション能力が向上する。
Training your social brain can improve your communication skills.
Literally 'brain of sociality'. Used to emphasize the social nature of the brain.
自閉症の研究では、社会性の脳の働きが注目される。
In autism research, the functioning of the social brain is a focus.
Describing someone who is good at socializing, reading social cues, or navigating social situations.
There is no direct equivalent for 'social brain' as a personality trait. Instead, describe the person's social skills.
彼は本当に社交的な人だ。
He's a real social brain. (He's a very sociable person.)
彼女は人間関係を読むのが上手い。
She has a social brain. (She's good at reading interpersonal relationships.)
Means 'sociable' or 'outgoing'. Can be used to describe someone with a 'social brain' in the sense of enjoying social interaction.
Do not use 社会脳 (shakai nō) to describe a person who is socially skilled. It sounds like you are calling them a scientific concept, not a person. Use 社交的 (shakōteki) or descriptive phrases instead.
彼はとても社交的で、誰とでもすぐに友達になる。
He's very social and quickly becomes friends with anyone.