被験者・被検者|ひけんしゃhikensha[2]nakadaka (mid-high)

1. nounsubject (of a medical experiment, etc.); test subject; trial subject; testee
   その実験じっけんの結果けっかをコントロールするのは被験者ひけんしゃの態度たいどである。↗

   It is the attitude of the subjects that controls the outcome of the experiment.
2. nounexaminee (of a full-body scan, etc.)

• SynonymモルモットCasualColloquial. Literally a guinea pig; figuratively a person treated like an experimental subject, with a negative nuance of being exploited.
• Antonym検者WrittenWritten/formal prose. The person who conducts the examination — the counterpart of 「被験者」 as the one examined.
• Antonym検査者NeutralNeutral. The person who performs the examination, the opposite of 「被験者」.

Use 「被験者」 for subjects of medical experiments or psychological tests, as in 「被験者を募集する」. For someone figuratively treated as a human experiment, 「モルモット」 fits; the person performing the examination is 「検査者」 (or 「検者」 in formal prose).

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 実験じっけんや試験しけんの対象たいしょうとなる者もの。