Here is my idea for your consideration. The idea is a combination of a brain that represent neurology and the leaf that represent natural. Hope you like the idea and if you have suggestions please feel free to let me know
I like where you are going with this but not crazy about the green. I would like to see more use of blue in the logo and the lettering different colors. I would like to see the logo more recognizable as a brain.
Thank you for the feedback, I am glad you like it. Your contest is in judging mode so only the 1st ranked designer will be able to submit entries. I will make the changes as you suggested but in order to submit them you will have to move me temporarily to 1st ranked.