[Analysis of consonant substitutions by dysarthria patients and Spanish speaking Broca's aphasia patients of the La Plata area].

The speech behaviour of 11 patients with exclusively or almost exclusively phonological disorders (2 anarthical patients and 9 with aphasis of the Broca type) is being tested with an one word repetition procedure. This paper only demonstrates the analysis of the consonant substitutions and of the consonant variables under the impact of substitution. The results can be summarized as follows: 1. There is a negative correlation between the amount with which consonant phonemes are substituted and the amount of their use in normal subjects. 2. The group of phonemes which is acquired latest in speech development of the child is also influenced mostly by substitutions. 3. In the majority of substitutions we find a differentiation in one or more variables of the substituent and the substitute. 4. The variables which are influenced by substitutions show an internal hierarchy in the system of language.