EFR signal quality is quantified by response-to-prestimulus RMS ratio

Evidence

EFRs were computed by adding responses to the positive and negative stimulus polarities (EFR = (Pos + Neg)/2). All subsequent correlational analyses were conducted on the averaged EFR waveforms. The signal-to-noise ratio (SNR) of the EFR responses was calculated as 20log10(RMSpost/RMSpre), where RMSpost and RMSpre were the root mean square of the amplitude in the ‘response’ period (defined as 25–75 ms post-stimulus) and the root mean square of the pre-stimulus period (defined as 50 ms pre-stimus until stimulus onset at 0 ms) respectively. — Dijk, Pim van, Physiology, Psychoacoustics and…, 4162

Categorization

• DEFINE: Clarifies the standard EFR SNR computation and why alternating polarities are averaged, a technical definitional element worth retaining.