Abstract
Attention deficit/hyperactivity disorder (ADHD) has been associated with a deficit in working memory across both verbal and spatial domains, but the precise nature of this deficit is poorly understood. The dual-component model postulates that working memory capacity consists of two dissociable components: maintenance in primary memory (PM) and recall from secondary memory (SM). Participants diagnosed with ADHD (n = 32) and age-matched controls (n = 31) performed both verbal and spatial free-recall tasks, and subsets of these two samples were selected for further comparison based on their use of a “recency” order-of-report strategy. The primary results showed that maintenance in PM appears to be largely intact whereas recall from SM appears to be deficient in ADHD relative to age-matched controls. Similar outcomes were observed across both task domains. Implications for understanding both the underlying pathology and treatment of ADHD are discussed.
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