Amplitude is a measurement of the what of a waveform, whereas frequency is a measurement of the what of a waveform?

Amplitude refers to the height or magnitude of a waveform, which indicates the strength or intensity of the signal. In the context of sleep studies and EEG waveforms, higher amplitude signals represent stronger brain activity, while lower amplitudes can indicate more subdued brain activity.

On the other hand, frequency measures how often these waveforms oscillate or repeat within a specific time frame, typically represented in hertz (Hz). It informs us about the speed of the waveform's cycles, which can be essential for determining different sleep states, such as REM sleep or non-REM sleep.

Understanding these definitions helps clarify why the correct answer highlights that amplitude measures the height of the waveform while frequency measures its speed. Recognizing this relationship is critical when interpreting data related to sleep and neurological activity.