Simplify the following text for a Grade 16 native English-speaking person.
Original: This is because abstract concepts elicit greater brain activity in the inferior frontal gyrus and middle temporal gyrus compared to concrete concepts when concrete concepts elicit greater activity in the posterior cingulate , precuneus , fusiform gyrus , and parahippocampal gyrus .
Simplified: This is because abstract concepts cause greater brain activity in the inferior frontal gyrus and middle temporal gyrus , compared to concrete concepts when concrete concepts cause greater activity in the posterior cingulate , precuneus , fusiform gyrus , and parahippocampal gyrus .