Question at position 9 Split-brain patients are unable to do which of the following?Compare something seen with something heard at the same timeCompare something seen now with something seen earlierFeel something with the left hand and then describe it in wordsFeel something with the right hand and then describe it in words

Question

Question at position 9 Split-brain patients are unable to do which of the following?Compare something seen with something heard at the same timeCompare something seen now with something seen earlierFeel something with the left hand and then describe it in wordsFeel something with the right hand and then describe it in words

BlackTom AI · Accepted Answer

Question: Split-brain patients are unable to do which of the following?

Option A: Compare something seen with something heard at the same time
- In split-brain patients, cross-hemisphere communication is disrupted. This could impair tasks that require integrating information across modalities or hemispheres, such as matching a visually presented item with an auditory cue from the other hemisphere. However, this is not the classic, most robust deficit described in standard split-brain literature, so this option is not the strongest match to the canonical symptom.

Option B: Compare something seen now with something seen earlier
- This task relies on memory and continuity of perceptual information across time, which does not inherently require interhemispheric transfer. A split-brain patient can still compare temporal visual information within the same hemisphere, so this option is not the typical core deficit associated with split-brain conditions.

Option C: Feel something with the left hand and then describe it in words
- This is the classic demonstration of a split-brain deficit. The left hand is controlled by the right hemisphere, which is not dominant for language in most people. Since describing or naming is language-based and typically localized to the left hemisphere, a sensation felt by the left hand (processed by the right hemisphere) cannot be easily verbalized. This specific disconnection between perception by the non-dominant hemisphere and language output explains the inability described here.

Option D: Feel something with the right hand and then describe it in words
- The right hand is controlled by the left hemisphere, which houses language centers in most individuals. Therefore, when the right hand feels something, the information can be transferred to the language-dominant left hemisphere, allowing description or naming. This makes this option a plausible task for split-brain patients and aligns with the expected preservations rather than deficits.

Summary: The most accurate depiction of the split-brain limitation among the choices is the difficulty in describing tactile information felt with the left hand, due to the severed cross-communication between the non-dominant hemisphere (processing tactile input from the left hand) and the language-dominant left hemisphere responsible for verbal description. The other options involve either cross-modal integration, temporal comparison, or are consistent with preserved verbalization when the language-dominant hemisphere can access the sensory input from the right hand.

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