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Hoarding disorder is not a moral failing; it is a psychiatric condition.

People with hoarding disorder may know their homes are unsafe, but struggle to balance feeling vs. reasoning.

Testing often shows selective executive-function impairment rather than the broad decline typical of dementia.

Hoarding disorder has always carried a certain mystery. Why do some people find it nearly impossible to part with objects that others would quickly discard? Over the past decade, neuropsychological research has begun to unravel this question, pointing to difficulties in executive function—the mental abilities that allow us to plan, prioritize, make decisions, and shift attention. Yet, even though these functions are disrupted in hoarding disorder, the pattern of impairment differs from dementia both in the nature of the deficits and in how they appear on clinical tests.

What the Research Shows

Recent research suggests that individuals with hoarding disorder often show weaknesses in inhibition, cognitive flexibility, and decision-making. In laboratory settings, they may have difficulty with tasks that require shifting attention or suppressing irrelevant details. Additionally, on measures such as the Wisconsin Card Sorting Test, widely used to assess abstract reasoning and flexibility, participants with hoarding symptoms tend to make more errors. This suggests cognitive rigidity rather than a loss of comprehension, and it helps explain why sorting and discarding possessions feels so cognitively exhausting for those with hoarding disorder.

In many cases, the impairment appears more selective than global. Studies of........

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