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The term 'acute' in relation to a person's intelligence refers to a sharpness or keenness of perception and understanding. Therefore, being able to notice very small differences aligns closely with this definition, as it emphasizes a heightened ability to discern nuances in various situations, which is a trait associated with sharp intelligence.

Having a basic understanding of concepts suggests a foundational level of comprehension, but does not imply the level of perceptiveness that the term 'acute' conveys. A strong interest in learning indicates motivation and curiosity, but does not necessarily reflect sharp analytical skills or perceptual acuity. Experiencing memory loss is contrary to the notion of acute intelligence, as impairments in memory would detract from a person's ability to analyze and make subtle distinctions. Hence, the focus on the ability to notice small differences effectively captures the essence of 'acute' as it pertains to intelligence.