| Perseverative errors and responses were significantly improved after intervention. |
| McGee and colleagues also noted improvement in quality of verbalizations, given that program entry verbalizations tended to be echolalic or perseverative speech. |
| Autism is a neurobehavioural disorder characterized by impairment of social relatedness, delayed and disordered communication, and restricted, perseverative and stereotypic behaviour patterns occurring in young children. |
| Additionally, they exhibited other unusual postures and perseverative behaviors and fail to evince normal separation anxiety when removed from their mothers. |
| A perseverative error consists of a repetition of a design. |
| In Section 2 we have established preferences for suffixal over prefixal morphology, and anticipatory over perseverative phonology. |
