Goal-directed action planning in infants with Down syndrome.
Down syndrome babies already show shaky goal plans at 7 months, and the culprit is motor-sensory, not IQ.
01Research in Context
What this study did
The team watched 7.5-month-old babies with Down syndrome reach for toys. They compared each move to babies without disabilities.
Cameras tracked hand paths and timing. The goal was to see who planned the shortest, smoothest route to the toy.
What they found
Babies with Down syndrome took longer, jerkier paths. Their reaches looked less efficient than the typical babies.
The delays lined up with each infant’s motor and sensory scores. Lower scores meant messier action plans.
How this fits with other research
Zalla et al. (2006) saw the same kind of clumsy action planning in autistic people. Two different diagnoses, same weak spot.
The twist: both studies blame motor and sensory glitches, not just low IQ. The problems show up early in Down syndrome and stay in autism.
Aller et al. (2023) widened the lens. They rated sensory issues across Down syndrome, autism, and other delays. All groups looked odd compared with typical kids, but each in its own way. Together the papers say: check senses and motor skills before you teach new goals.
Why it matters
If you work with infants or toddlers, screen reaching and grasping first. Smooth, quick reaches signal that the baby can plan. Add extra tactile cues, stable seating, or weighted toys to boost feedback. Early motor-sensory support may lift later language and play skills.
Want CEUs on This Topic?
The ABA Clubhouse has 60+ free CEUs — live every Wednesday. Ethics, supervision & clinical topics.
Join Free →Place the toy closer and give the baby a textured surface to touch before the reach.
02At a glance
03Original abstract
BACKGROUND: Down syndrome (DS) is a neurogenetic disorder associated with risk for executive dysfunction, or difficulties with the cognitive processes required for planning volitional, goal-directed behaviour. This study examines the developmental origins of difficulties with goal-directed action planning in infants with DS to inform our understanding of the cognitive phenotype associated with DS and its implications for intervention. METHOD: First, the study compared the performance of infants with DS (n = 44, mean chronological age = 7.5 months, SD = 2.3) and typically developing infants (n = 31, mean chronological age = 7.5 months, SD = 2.9) on plan production and planning efficiency during an early planning task. Next, potential sources of variability in planning behaviour (motor performance and sensory processing) within the DS sample were examined. All infants completed an early planning laboratory task and the Bayley Scales of Infant Development-III Cognitive Scale. The motor and sensory skills of infants with DS were assessed by the motor scales of the Bayley Scales of Infant Development-III and the Infant Sensory Profile-2. DS-related biomedical history information was provided by caregivers for the infants with DS. RESULTS: Between-group differences in planning were observed on the dimensions of strategy production and completion, such that infants with DS were less efficient in their strategy execution than typically developing infants. In the DS group, motor skills and sensory processing were associated with planning efficiency on all components of the early planning task. CONCLUSIONS: Less efficient action planning in infants with DS may disrupt the shaping of goal-directed behaviour, and the identification of early risk factors associated with planning efficiency has important implications for early intervention.
Journal of intellectual disability research : JIDR, 2020 · doi:10.1111/jir.12763