In our study we found both errors that are usually
described as phonological (for example, velar fronting)
and errors that are usually described as phonetic
(for example distortions such as lateral sibilants). It is
important to note that although many errors could be
described in terms of known phonological processes
this does not necessarily mean that the errors are
caused by a phonological or cognitive impairment,
although it is possible that for at least some children a
phonological impairment exists alongside an ASD
diagnosis. Since no correlation was found between
language skills and the number of errors, delayed
language is not an obvious cause of delayed articulation.
However, it is still possible that a history of early
language delay, or a difference in language learning
environment, specifically less reciprocal interaction
(a core feature of ASDs) may play some part in the
speech difficulties we described. For example,
children with ASD may be less likely to respond to
modelling of correct speech since they have difficulty
with social interaction.