脳波

1. Origins, structure, and basic meaning

• Structure: 脳波(のうは) combines 脳, brain, with 波, wave.
• Basic usage: It refers to wave patterns associated with brain activity that can be measured or recorded; the examples concern a test and sleep research.

2. Common pitfalls and similar expressions

• Measuring and recording
  • 脳波を測定した focuses on measurement, while 脳波の変化を記録している focuses on recording changes. Translating both merely as testing loses that distinction.