Interesting read in the Boston Globe about how living in a city hurts your brain. As one would probably expect, the stimuli of a city makes living in one exhausting and harder to remember things.
For most of the article it makes the argument that living in more "natural" spaces is better for people. However, at the end it touches upon the fact that city living tends to produce innovation and creative solutions.
So at the end it's inconclusive in my mind...regardless I would advise enjoying Grant Park and the various parks throughout the Chicagoland area.