Question

the main, or central, idea of the passage is individuals with eidetic memory are temporarily able to retain detailed images in their minds. how does the detail in bold develop the main idea?

do some individuals have the amazing ability to take perfectly accurate, permanent mental \snapshots,\ which can be stored in the brain for future retrieval? fictional figures aside, no. but while this popular notion of \photographic memory\ is unfounded, research has demonstrated the existence of a fascinating phenomenon called eidetic memory, in which memory actually does have a camera - like quality. people with eidetic memory are able to look at an object or picture and then look away or close their eyes and continue to \see\ the object or picture in their minds. these images last only a few minutes at most before dissipating, and they are typically not entirely accurate. still, the degree of detail that \eidetikers\ can recall during those first few minutes is astonishing. interestingly, the phenomenon occurs almost entirely in children, with an estimated two to ten percent of children affected; virtually all eidetikers lose their unusual ability before reaching adulthood.

it argues for the idea of true photographic memory.
it highlights the limitations of eidetic memory.
it shows that eidetic memory is of no value.

Explanation:

1. Analyze the first option: The bolded text says the images in eidetic memory last briefly and aren't entirely accurate, which goes against true photographic memory (which is supposed to be permanent and accurate). So this option is wrong.
2. Analyze the second option: The bolded details ("last only a few minutes", "not entirely accurate") show the restrictions of eidetic memory, which develops the main idea by adding context about its limitations.
3. Analyze the third option: The passage later says the detail recall is astonishing, so it's not of no value. This option is incorrect.

Answer:

It highlights the limitations of eidetic memory.