The use of diacritics for visual articulatory behaviours

This paper proposes the use of a set of symbols related to the International Phonetic Alphabet (IPA) and diacritics for the description and notation of articulatory behaviours which can be perceived visually, but which have no effect on the perceived auditory quality of phonemes produced. It is suggested that the use of such symbols will clarify clinical analysis of speech patterns. Examples of clinical usage are given.