Project helps people with intellectual disabilities participate in clinical studies
The NIH Toolbox Cognitive Battery, an assessment of cognitive functioning for adults and children participating in neuroscience research, can be adapted to people with intellectual disabilities by modifying some test components and making accommodations for the test-takers' disabilities, according to researchers funded by the National Institutes of Health (NIH).
The adaptations ensure that the battery can be used to assess the cognitive ability of people with intellectual disabilities who have a mental age of five years and above, providing objective measures that could be used in a wide variety of studies.
The research team, led by David Hessl, PhD, of the University of California Davis Medical Center, published their findings in Neurology. The work was funded by NIH's Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) and National Center for Advancing Translational Sciences, as well as the Administration for Community Living.
The battery is administered on a computer tablet and measures memory, vocabulary, reading and executive functioning, which includes skills such as the ability to shift from one thought to another, pay attention and control impulses. The researchers adapted the battery by reducing the complexity of the instructions and including developmentally appropriate starting points. They also developed a structured manual to guide test administrators.
The researchers validated the battery and its modifications by assessing 242 people ages six through 25 with fragile X syndrome, Down syndrome or other disabilities. They found that the battery produced reliable and valid results for those with a mental age of five years and above. The authors called for additional research to adapt the battery to people with lower mental ages and to older adults with intellectual disability who may be experiencing cognitive decline or dementia.
