Before revision:  Formant transitions in speech are characterised by short rising and falling FM-sweeps in the kilohertz frequency range. These sounds elicit a pitch percept that deviates from their average frequency. This study uses this perceptual effect, termed here the sweep pitch shift, to inform a model characterising the neural encoding of FM.
After revision:  Formant transitions in speech are characterised by short rising and falling FM-sweeps in the sweep pitch shift, to inform a model characterising the neural encoding of FM.