Assessment & Research

Eyewitness recall and suggestibility in individuals with Down syndrome.

Collins et al. (2016) · Journal of intellectual disability research : JIDR 2016
★ The Verdict

Young people with Down syndrome are as accurate and no more suggestible as typically developing kids of the same mental age.

✓ Read this if BCBAs who conduct interviews, assessments, or testify about clients with Down syndrome.
✗ Skip if Practitioners who only serve clients with ASD or other ID etiologies.

01Research in Context

01

What this study did

The team compared eyewitness memory in young people with Down syndrome to typically developing kids of the same mental age.

Each child watched a short staged event. Later an adult asked questions that either stayed neutral or slipped in misleading hints.

The researchers then counted how many correct details each child recalled and how often they gave in to the misleading cues.

02

What they found

Kids with Down syndrome remembered just as many correct details as their mental-age peers.

They were also no more likely to repeat the misleading hints. Accuracy and suggestibility scores were almost identical between groups.

03

How this fits with other research

Mruzek et al. (2019) pooled many studies and found that, across all causes of intellectual disability, people are usually more suggestible. The new Down-syndrome-only data seem to contradict that trend.

The gap disappears when you look at diagnosis. W et al. mixed many syndromes together, while D et al. focused only on Down syndrome. Narrow diagnosis and mental-age matching may explain the rosier picture.

Micai et al. (2021) and Borella et al. (2013) show small inhibition problems in Down syndrome. Even so, these executive slips do not bleed into eyewitness accuracy, a useful boundary for clinicians to know.

04

Why it matters

You can interview clients with Down syndrome without assuming they will be overly suggestible. Use the same open, neutral prompts you use with any child of similar mental age. If a case involves legal testimony, the findings give you data to argue for equal credibility rather than automatic dismissal.

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Keep your questions neutral during intake interviews—no extra caution needed for suggestibility with Down syndrome clients.

02At a glance

Intervention
not applicable
Design
case control
Population
down syndrome, neurotypical
Finding
null

03Original abstract

BACKGROUND: Many criminal justice professionals perceive the eyewitness skills of individuals with intellectual disabilities to be weaker than those of typically developing (TD) individuals. Down syndrome (DS) is one of the most common genetic causes of intellectual disabilities, yet there is no research addressing eyewitness skills in this population. This study examined the eyewitness recall and suggestibility of young people with DS. METHOD: Young people with DS and mental age-matched TD children viewed a video of a non-violent petty crime and were subsequently asked to freely recall the event before being asked general and specific questions incorporating both misleading and non-leading prompts. RESULTS: Compared with mental age-matched TD individuals, young people with DS produced as much information, were just as accurate and were no more suggestible. CONCLUSIONS: The eyewitness memory skills of young people with DS are comparable to those of mental age-matched TD children. The implications of these findings for the forensic context and eyewitness memory are discussed.

Journal of intellectual disability research : JIDR, 2016 · doi:10.1111/jir.12310