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Consider these lines: "A split-brain patient is unable to name a picture that is shown in the patient's left visual field because the information is only available in the largely nonverbal right hemisphere. However, they are able to recreate the picture with their left hand, which is also controlled by the right hemisphere." Which conclusion do the quoted lines best support?
AThe right hemisphere cannot process pictures of any kind
BThe left hand is controlled by the left hemisphere
CNaming what one sees depends on a hemisphere specialized for language
DSplit-brain patients lose the ability to draw from memory
Answer & Solution
Correct answer: C. Naming what one sees depends on a hemisphere specialized for language
1. The patient sees the picture, since the right hemisphere receives it and can drive the left hand to draw it.
2. Yet the patient cannot say its name, and the stated reason is that the receiving hemisphere is largely nonverbal.
3. If perception is intact but naming fails whenever the verbal hemisphere is cut off, then naming depends on a language-specialized hemisphere.
4. That is option C, and it is the only conclusion the evidence compels.
5. Option A fails because drawing the picture proves the right hemisphere processed it.
6. Option B contradicts the quoted lines, which say the left hand is controlled by the right hemisphere.
7. Option D fails because recreating the picture is precisely what the patient can still do.
_Source: OpenStax Psychology 1e (CC BY 4.0), Ch 3 "Biopsychology", section 3.4 The Brain and Spinal Cord_
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