Though the symptoms of ADHD and mild cognitive impairment overlap in older adults, a new study found that they impair distinct areas of the brain, and called into question the purported link between ADHD and dementia.
and those with MCI both displayed normal executive functioning. Participants with ADHD performed similarly to controls in a context with added semantic structure, indicating a frontally mediated encoding deficit in ADHD and a temporally mediated storage deficit in MCI. Only participants with MCI showed robust semantic retrieval deficits.
Previous literature has speculated that ADHD may be a risk factor for dementia. Researchers concluded that, although both disorders display dementia-like features, “the pathological processes underlying ADHD and MCI are fundamentally distinct, and that their putative association in prior work is more parsimoniously explained by ADHD mimicking the MCI phenotype.
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