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Parameterizing effects of precursor spectral characteristics on categorization of subsequent vowel sounds

• Precursor stimuli in these studies are often speech (e.g., a sentence). Typically, the researcher uses a filter to amplify frequencies in the precursor that are contrastive with frequencies in the target sound, producing the SCE. • Spectral properties of speech change rapidly throughout its duration. While the researcher used a filter to add a peak to the precursor's long-term spectrum, s/he ceded control as to when that peak occurs and for how long. This obscures key characteristics of precisely how earlier sounds influence perception of later sounds. • The present study systematically varied key spectral properties of precursor sounds to vary their influence (via SCEs) on vowel categorization.