Comparing the effects of vocoded speech on behavioural vowel recognition and the frequency following response

Improvements in noise-vocoded speech perception are driven by increases in spectral resolution (i.e., channel number), whereas FFRs are driven by temporal periodicity in vocoded signal waveforms. Consequently, FFRs may grossly capture neural phase-locking to the temporal features of vocoded signals but may not be a useful index for understanding how changes in spectral resolution impact perception.