Changes in the early communicative behaviors of young children with significant cognitive and motor developmental delays in a two-year span.

Introduction: This study examines longitudinal changes in communicative behavior of young children with significant cognitive and motor developmental delays (SDD) and determines their individual communicative trajectories. A second focus of this study is the relation of changes in communicative behavior with motor skills.

Methods: Data consists of codes resulting from a self-developed coding scheme used on observations of 23 children in three different settings and responses on a questionnaire. First, group trends were determined to find out whether communication-related variables tend to significantly change over the course of two years. Furthermore, these findings were contrasted with the individual trajectories of the children. Next, the association of initial communicative skills and (the acquisition of) specific motor skills with the change in their communicative functioning was studied. Wilcoxon Signed Ranks and correlational analyses were used to answer the research questions.

Results: Out of sixteen different variables related to communicative behavior, ten changed significantly over the course of two years. Children with more focus on prompt on the first datapoint showed a significantly larger increase of signs of functionality. Still, all children showed highly individual trajectories. Children with better motor skills on the first datapoint showed a significantly larger increase in communication rate.

Conclusions: Results show that if a myriad of detailed variables are taken into account children with significant cognitive and motor developmental disabilities do change regarding their communicative functioning, but that they tend to all show unique developmental trajectories. Children with stronger skills in some aspects of communication and motor functioning, can be considered advantaged regarding their communicative development.