Atypical speech sounds are those sounds found in disordered speech that have not been recorded in natural language (or very rarely so). Another term used is unattested sounds. It is important for Speech–Language pathologists and Speech–Language therapists to be able to recognize, describe, and transcribe these sounds.

Atypical sounds are restricted to consonants, because it is not possible to produce vowel sounds outside the vowel area within the oral cavity, and this area is fully exploited in natural language (an exception might be ingressive vowels, but even these are found in some languages). The range of atypical consonants can be described in terms of their place and manner of articulation, and in terms of resonance and airflow.

Atypical places of articulation include dentolabial (upper lip articulating with ...

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