Learning potential and cognitive abilities in preschool boys with fragile X and Down syndrome.

Valencia-Naranjo et al. (2017) gave a short learning-potential scale to preschool boys with fragile X and Down syndrome. They tested the kids twice to see which skills improved and which stayed flat.

The team wanted a quick way to spot the easiest cognitive targets for each syndrome before starting therapy.

Both groups gained points on the overall scale from pre to post. Kids with fragile X began higher on short-term memory tasks, but their progress slowed on auditory memory and sorting games.

Children with Down syndrome showed less growth on hearing-based tasks and categorizing, hinting these areas are harder to budge.

Rutter et al. (1987) first mapped Down syndrome visual-motor strengths with the K-ABC. Nieves agrees visual skills look trainable, but adds that auditory memory is stubborn even in preschool.

Phillips et al. (2014) saw poor backward spans in teens with Down syndrome. The new data show the bottleneck starts earlier—auditory memory was already hard to modify at age four.

Adams et al. (2024) used ERPs to show fragile X preschoolers over-react to all sights. Nieves offers the behavioral half: their short-term memory starts strong but plateaus fast, so don’t overload visual channels.

Xenitidis et al. (2010) found kids with Down syndrome can still learn repeating sound patterns despite low spans. Nieves seems to clash here—auditory memory looked untrainable—but the tasks differ. K’s study tapped implicit sequence learning; Nieves tested conscious recall and sorting. Both can be true: repeat patterns work, yet deliberate recall stays weak.

You can run the five-minute scale before writing goals. If the child has fragile X, lean on visual cues but watch for plateau—rotate tasks early. For Down syndrome, pick visual-motor and repeated-pattern drills; skip heavy auditory memory goals. Use the quick score to show parents why some skills get targets and others wait.