Which syndrome is associated with a leftward shift in IQ, often with verbal IQ lower than performance IQ and an overall IQ in the high 80s to low 90s?

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Multiple Choice

Which syndrome is associated with a leftward shift in IQ, often with verbal IQ lower than performance IQ and an overall IQ in the high 80s to low 90s?

The pattern being tested is an uneven IQ profile where nonverbal or performance abilities tower over verbal abilities, producing a leftward shift in the overall IQ profile. When verbal skills are weaker than nonverbal skills, the verbal IQ sits lower than the performance IQ, and the overall IQ often lands in the high 80s to low 90s. This particular configuration is commonly linked to neurofibromatosis type 1. In neurofibromatosis type 1, learning and cognitive profiles frequently show language-related tasks being more affected than perceptual and problem-solving tasks. That leads to a relative weakness in verbal measures while nonverbal reasoning remains comparatively stronger, yielding the leftward shift described and an average-to-low-average overall IQ that clusters around the 90s for many individuals. The other conditions tend to produce different cognitive patterns. Williams syndrome, for example, typically shows relatively strong verbal and social skills with notable weaknesses in visuospatial tasks, producing a profile where verbal abilities exceed nonverbal ones. Angelman syndrome usually involves profound language impairment and global developmental delays, not an average high-90s IQ. Prader-Willi often presents with broader cognitive and adaptive challenges with less of the specific verbal-versus-nonverbal split described here.

The pattern being tested is an uneven IQ profile where nonverbal or performance abilities tower over verbal abilities, producing a leftward shift in the overall IQ profile. When verbal skills are weaker than nonverbal skills, the verbal IQ sits lower than the performance IQ, and the overall IQ often lands in the high 80s to low 90s. This particular configuration is commonly linked to neurofibromatosis type 1.

In neurofibromatosis type 1, learning and cognitive profiles frequently show language-related tasks being more affected than perceptual and problem-solving tasks. That leads to a relative weakness in verbal measures while nonverbal reasoning remains comparatively stronger, yielding the leftward shift described and an average-to-low-average overall IQ that clusters around the 90s for many individuals.

The other conditions tend to produce different cognitive patterns. Williams syndrome, for example, typically shows relatively strong verbal and social skills with notable weaknesses in visuospatial tasks, producing a profile where verbal abilities exceed nonverbal ones. Angelman syndrome usually involves profound language impairment and global developmental delays, not an average high-90s IQ. Prader-Willi often presents with broader cognitive and adaptive challenges with less of the specific verbal-versus-nonverbal split described here.

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