Full-term infants who had slept in the prone position since birth were followed to detect early postural abnormalities and differentiate potential peripheral abnormality from abnormalities of a central origin. Results showed that disappearance of initial signs of abnormality appeared to be muscular, and symptoms disappeared faster when a motor…

Thirty infants were studied monthly between one and four months to determine how long cyclical motor activity (CM) persists beyond neonatal period. Although rate and irregularity of CM during active sleep and waking states did not change across these four months, there was a pronounced drop in the strength of CM in the waking state from two months…

Weekly observations of 4 infants in a standard arm-extended reaching task demonstrated that the infants first reached at ages ranging from 12 to 22 weeks. Results suggest that the infant central nervous system does not contain programs that detail hand trajectory or muscle activation patterns; rather, these patterns are the consequence of the…

Comments on Thelen and Ulrich's monograph in this issue. Examines theoretical and empirical sections and findings, concluding that the authors have taken a major step forward by introducing the dynamic systems perspective to the study of behavioral coordination in infants, thus opening the way for experimental investigation of phenomena that could…

Studied head position preference in 20 newborns differing by Cesarean or vaginal delivery and sex. Found that neither factor accounted for differences. The head turned right more often and was maintained longer in this position during quiet wakefulness, regardless of scoring method. When using global scoring, duration of midline position was…

The aim of this study was to explore motor development in children with cerebral palsy (CP) using developmental curves for CP, subtypes, and the five severity levels of the Gross Motor Function Classification System (GMFCS). The Gross Motor Function Measure (GMFM) and the GMFCS were applied to 317 children (145 females, 172 males) with CP, aged…

We calculated visual ability in 13 strains of mice (129SI/Sv1mJ, A/J, AKR/J, BALB/cByJ, C3H/HeJ, C57BL/6J, CAST/EiJ, DBA/2J, FVB/NJ, MOLF/EiJ, SJL/J, SM/J, and SPRET/EiJ) on visual detection, pattern discrimination, and visual acuity and tested these and other mice of the same strains in a behavioral test battery that evaluated visuo-spatial…

Background: Children with developmental coordination disorder (DCD) are often identified by classroom teachers and the identification process relies heavily on teachers' perceptions. The literature would suggest that teachers' perceptions may be influenced by a child's gender, behaviour and the type of motor problem they demonstrate. To date, the…

Using a continuous tracking task, the authors examined whether stopping is resistant to expectancies as well as whether it is a representative measure of response control. Participants controlled the speed of a moving marker by continuously adjusting their response force. Participants stopped their ongoing tracking in response to auditory signals…

Neurological examination of children includes the screening for soft neurological signs (NSS). There is little knowledge about their evolution during adolescence, except that their lasting presence has been associated with developmental, psychological, and cognitive disorders. We report the results of a NSS exam (assessing gross and fine motor…

This paper is in memory of Esther Thelen, who passed away while President of the Society for Research in Child Development. A survey of Esther Thelen's career reveals a trajectory from early work on simple movements like stepping, to the study of goal-directed reaching, to work on the embodiment of cognition, and, ultimately, to a grand theory of…

Self-regulation and self-determination are part of a continuum of behaviors that are acquired through interaction with the social and physical environment and through problem solving based on experiences that begin in infancy and build throughout early childhood. These abilities should be nurtured early for all children, especially within the…

Concludes that guided instruction in psychomotor skills at the nursery school level leads to significant improvements in motor patterns for boys and girls. (RB)