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How are the sounds b, d, and g different from p, t, and k?
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speech
Speech is the faculty of producing articulated sounds, which, when blended together, form language.
The primary difference between the sounds b, d, g and p, t, k in English lies in the state of the vocal cords during their production.1
- Voicing: The sounds b, d, and g are voiced consonants, meaning they are produced with the vibration of the vocal cords. In contrast, p, t, and k are voiceless consonants, produced without such vibration.1
- Aspiration: When these sounds are spoken in isolation, a secondary distinction often emerges regarding aspiration—the period of voicelessness that occurs during the release of the articulation. The voiceless stops p, t, and k are typically aspirated (accompanied by a puff of air), whereas the voiced stops b, d, and g are unaspirated.2
Both sets are classified as oral stops, meaning they are formed by creating a complete closure in the oral tract that obstructs the airstream, which is then released with a plosive quality. While they share the same places of articulation—b/p are bilabial, d/t are alveolar, and g/k are velar—the presence or absence of vocal cord vibration is the fundamental feature that distinguishes them in English.31