Question at position 7 Which of these is true of split-brain people?After enough time, the corpus callosum grows back.Half of the brain knows things the other half doesn’t know.The talking half of the brain says it “no longer feels like a whole person.”Overall intelligence drops to about half of its original level.

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Question at position 7 Which of these is true of split-brain people?After enough time, the corpus callosum grows back.Half of the brain knows things the other half doesn’t know.The talking half of the brain says it “no longer feels like a whole person.”Overall intelligence drops to about half of its original level.

BlackTom AI · Accepted Answer

In this question about split-brain patients, we need to evaluate each statement for its accuracy based on what is known about the effects of corpus callosotomy and hemispheric specialization.
Option 1: 'After enough time, the corpus callosum grows back.' This is not accurate. The severed corpus callosum does not regenerate to reconnect the two hemispheres in a typical medical context; surgery is intended to disrupt interhemispheric communication permanently.
Option 2: 'Half of the brain knows things the other half doesn’t know.' This captures a key finding from split-brain research: the two hemispheres can process information independently, so knowledge acquired by one hemisphere may not be accessible to the other without cross-communication via the corpus callosum. In practice, this leads to some tasks being performed with information that the other hemisphere does not consciously know.
Option 3: 'The talking half of the brain says it “no longer feels like a whole person.”' This description mixes subjective experience with linguistic reporting. While individuals may experience unusual dissociation or lack of integration between hemispheres, the statement anthropomorphizes the brain in a way that isn’t a standard empirical claim about split-brain patients.
Option 4: 'Overall intelligence drops to about half of its original level.' This is a common misconception. Intelligence is not simply halved when the corpus callosum is severed; many cognitive abilities remain intact, and overall IQ often remains within the normal range, though certain tasks that require interhemispheric coordination may be impaired.
Overall, by focusing on interhemispheric communication and the independence of hemispheric processing, option 2 aligns with the core observation from split-brain studies, while the other statements misrepresent regeneration, subjective experience, or global intelligence consequences.

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