Assessment & Research

Reasoning About Trust Among Individuals With Williams Syndrome.

Ng et al. (2015) · American journal on intellectual and developmental disabilities 2015
★ The Verdict

Adults with Williams syndrome approach strangers a lot, yet they can still judge who is lying.

✓ Read this if BCBAs writing safety plans for adults with Williams syndrome in day or residential programs.
✗ Skip if Clinicians who only serve young children or do not support clients with WS.

01Research in Context

01

What this study did

Ng et al. (2015) asked adults with Williams syndrome to judge two types of liars. One liar always gave wrong facts. The other liar gave facts that sounded nice but were still false.

The adults listened to stories and picked who they would trust. A control group of typical adults did the same task.

02

What they found

Adults with Williams syndrome distrusted both liars. They did not favor the nice-sounding liar over the plainly wrong one.

This shows they can weigh motives, not just warmth. Their friendly style is not blind trust.

03

How this fits with other research

Lough et al. (2016) found the same adults rated themselves as less vulnerable than their parents did. Together the studies show a gap: they feel safe, yet still judge others carefully.

Finke et al. (2017) later used these findings to build a short social-skills class for adults with WS. Knowing that trust judgment is intact lets teachers focus on safety rules, not basic suspicion training.

Lough et al. (2015) reported that youth with WS often invade personal space. Rowena’s adult data help explain why: they approach people, but they still decide who is safe.

04

Why it matters

You can stop warning clients with Williams syndrome to simply “stay away from strangers.” Instead, teach them how to spot lies and rehearse exit plans. Their trust gauge works; they just need clear rules and practice.

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Role-play spotting two types of lies and walking away with your WS client.

02At a glance

Intervention
not applicable
Design
case control
Sample size
47
Population
developmental delay
Finding
null

03Original abstract

The present study examines whether individuals with Williams syndrome (WS) might indiscriminately trust in others, as is suggested by their strong tendency to approach and interact with strangers. To assess this possibility, adults with WS (N=22) and typical development (N=25) were asked to reason about the trustworthiness of people who lie to avoid getting in trouble versus to avoid hurting others' feelings. Findings indicated that participants with WS distrusted both types of liars and made little distinction between them. These results suggest that the high level of social approach behavior in individuals with WS cannot be explained in terms of indiscriminate trust.

American journal on intellectual and developmental disabilities, 2015 · doi:10.1352/1944-7558-120.6.527