Which unit is used to describe EEG sensitivity?

The correct choice for describing EEG sensitivity is microvolts (µVolts). In the context of electroencephalography (EEG), sensitivity refers to the smallest voltage change that can be detected and recorded by the EEG equipment. EEG measures the electrical activity of the brain, and the signals produced by this activity are typically very small, often in the range of microvolts. Therefore, using microvolts as a measurement unit allows for a precise representation of the brain's electrical signals, which is crucial for accurate interpretation and analysis in sleep studies or neurological assessments.

The other units listed are either too large for the signals typically recorded in EEG or represent different physical quantities. Millivolts is a larger unit and is generally not used for EEG sensitivity due to the smaller scale of brain wave activity. Amperes measure current rather than voltage and are not applicable in this context. Decibels are a logarithmic unit used to express ratios, often used in audio and acoustics but not suitable for describing voltage sensitivity in EEG recordings.