Identifying a vowel requires at least two of its formants

Evidence

The frequencies associated with these formants provide information about the identity of the vowel, but successful identification of a vowel requires the presence of at least two of the formants. Consequently, the ear must have some ability to integrate information across frequency, but how much? and over what frequency range? — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 522

Categorization

• QUESTION: The chapter poses how much across-frequency integration the ear performs — a puzzle refined but not fully resolved.
• XREF: connects to: Vowel identification depends on formant peaks being representable in the output spectrum. — David Howard, Jamie Angus, coustics and Psychoacoustics, 1368