Cognitive abilities in Williams syndrome.

Miezah et al. (2020) gave a full cognitive battery to a small group of people with Williams syndrome.

They looked at memory, speed, language, and executive skills. Age was not linked to scores.

Every person had a different pattern. Some had strong auditory skills. Others had slow processing or weak executive skills.

Because the spread was so wide, the team warns against using any single "WS profile" in planning.

Lawer et al. (2009) saw the same wide scatter in Down syndrome. Both papers say: assess the child, not the label.

Bódizs et al. (2014) add a twist. They show sleep quality in WS gets worse with age, even though Daniel’s cognitive scores stay flat. The two findings sit side-by-side: night-time wear-and-tear may climb, but day-time test scores can hold steady.

Bigham et al. (2013) zoom in on color vision. Like Daniel’s broad battery, they find some skills lag while others stay typical. Together, the papers build a picture of patchy, domain-by-domain strengths and gaps.

For BCBAs this means: never trust the phrase "classic WS strengths." Run your own probes. If a teen suddenly struggles with tasks she once mastered, check sleep first—Róbert’s data say nightly rest may be slipping even when scores look stable.