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The interpretation of vowel sounds depends on perceived characteristics of the speaker [e.g., average first formant (F1) frequency]. A vowel between /ɪ/ and /e/ is more likely to be perceived as /ɪ/ if a precursor sentence indicates that the speaker has a relatively high average F1. Behavioral and electrophysiological experiments investigating the locus of this extrinsic vowel normalization are reported. The normalization effect with a categorization task was first replicated. More vowels on an /ɪ/‐/e/ continuum followed by a /papu/ context were categorized as /ɪ/ with a high‐F1 context than with a low‐F1 context. Two experiments then examined this context effect in a 4I‐oddity discrimination task. Ambiguous vowels were more difficult to distinguish from the /ɪ/‐endpoint if the context /papu/ had a high F1 than if it had a low F1 (and vice versa for discrimination of ambiguous vowels from the /e/‐endpoint). Furthermore, between‐category discriminations were no easier than within‐category discriminations. ...

At which processing level does extrinsic speaker information influence vowel perception?