I'm sorry that I didn't check back earlier, but the language centers of the brain aren't in one general area. There are 3 centers, Wernike's area, Broca's area and the angular gyrus. What you want to look into is the angular gyrus and Wernike's area. The angular gyrus creates that voice in your head whenever you read anything, and the Wernike's area allows you to understand words that are you hear. Broca's area is what shapes the turns on and of the muscles that make you speak, and therefore it's located in part of the motor (motion) cortex. The motor cortex is the 'farthest back' layer of the frontal lobe.(See the 1st picture)
Wernike's area is located right in between the temporal and parietal lobes (see the 2nd picture), and this makes sense because the temporal lobe is where the auditory cortex is and where most sounds get processed and the Wernike's area receives the sounds that are words. The parietal lobe helps us perceive things about the 'data' or stimuli that is sent to our brain. Perceiving is different than the sensation of a stimulus (anything that happens in the environment around you (for example when you touch a rug, your body receives the stimulus and experiences the sensation (or feeling) of touching a rug, but what your brain does is that it perceives that you are touching a rug). Perception is the interpretation of sensations that are sent to your brain. So, the sensation is when you touch (or see, hear, taste, or smell) _________ and you're like oh! That's ___________! Since Wernike's area interprets auditory information, its location between the parietal and temporal lobes makes sense. The reason why there can be things in between the lobes is because the lobes are separated by things called fissures which are just spaces, and some parts of them can be filled.
The angular gyrus is located in the parietal lobe (see picture 3 & 4), and that's because it interprets random letters that you see on a piece of paper into words and the little voice in your hear when you try to read. In case you wanted to know, because the angular gyrus interprets what you see, it works with the visual cortex which is at the very back of the occipital lobe of the brain (see picture 5).
And, about the group's reading of passages, I do think you should give them a small simple quiz on things with answers that could be found in the reading, because everyone gets analytical or "thinking in-between-the-lines" questions wrong because we all perceive what we read differently. So, you would be measuring their ability to comprehend what they have read.
(The brain is pictured on the other side compared to the other pictures)
Let me know if you have any more questions, and I'll get back to you as soon as possible!
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— The Eleventh Doctor