also: ブレイン
He was involved in making policy as an adviser to the prime minister.
選挙戦略は若いブレーンたちが考えた。
A group of young strategists came up with the election strategy.
noun
brain; brain organ
Katakana use for the physical brain. In ordinary Japanese, 脳 is the normal word; ブレーン or ブレイン is more likely in foreign-word contexts, titles, branding, or explanatory references.
普通の文章では、ブレインよりも「脳」と書くほうが自然だ。
In ordinary writing, it is more natural to write 脳 than ブレイン.