In the context of dementia, which temporal lobe is typically retained longer before significant atrophy occurs?

• A. The left temporal lobe
• B. Neither temporal lobe is affected in dementia
• C. The right temporal lobe
• D. Both temporal lobes are affected equally from the onset

Answer: (C)

Verified step by step guidance

1. Understand that dementia often involves atrophy (shrinkage) of brain regions, including the temporal lobes, which are critical for memory and language functions.
2. Recognize that the temporal lobes are divided into left and right hemispheres, each associated with different cognitive functions: the left temporal lobe is more involved in language processing, while the right temporal lobe is more involved in nonverbal memory and spatial abilities.
3. Review clinical and neuroimaging studies that show in many types of dementia, such as Alzheimer's disease, the left temporal lobe tends to show earlier and more significant atrophy due to its role in language and verbal memory, which are often affected early.
4. Note that the right temporal lobe is typically retained longer before significant atrophy occurs, meaning it degenerates later in the progression of dementia compared to the left temporal lobe.
5. Conclude that among the options, the right temporal lobe is the one usually preserved longer in dementia before significant atrophy, which aligns with the correct answer.