dysphasia developmental aphasia, developmental dysphasia dysphonia [Grk dysphōnía ‘roughness of sound’]

In speech-language pathology, term covering a number of voice disorders caused by deficient phonatory techniques, growths or infections in the larynx, or psychological factors, such as stress or depression. ( also aphonia)

In neurolinguistics, term referring to a grave impairment of prosody, such as a disturbance in the contour, intensity, or the temporal structure of the utterance. For instance, differences between main and secondary stress in syllables may be leveled so that all syllables are spoken with the same intensity. ( also language disorder, specific language impairment)

References

Baltaxe, C. and J.Q.Simmons. 1985. Prosodic development in normal and autistic children. In E. Schoper and G.V.Mesibov (eds), Communication problems in autism. New York. 95-125.