The effects of developmental delay on sustained attention in young children.

The development of developmentally delayed young children is similar to that of normal children in sequence and organization. The hypothesis of this research was that delayed children do differ from the norm when tasks involve discerning nuances, balancing competing stimuli, or acquiring and retaining selected information. Using a videotaped free-play situation, we examined attention deployment behaviors of 3 groups: normally developing (ND), Down syndrome (DS), and developmentally delayed with uncertain etiology (UE). Gesell DQ scores ranged from 50 to 75 in the latter 2 samples. In Study 1, infants had developmental ages of 12-24 months. The UE subjects spent less time engaged with toys than ND or DS subjects, and both delayed groups had less simultaneous appraisal of the environment, more time unoccupied in any way, and more throwing behavior than the ND group. In Study 2, at the 22-30-month developmental age range, DS and UE subjects had patterns of play that included many primitive activities such as banging and mouthing. Taken together, the results show reductions in ongoing acquisition and elaboration of information during play; these in turn may have significant developmental ramifications.