First off, welcome to the world of Neuroscience - its huge with people working solely on computers or bioengineering to people who do direct readings off of brain cells. The important thing about finding a lab for graduate school is finding a good fit, both with your advisor and with the people in the lab. I spend as much or more time in the lab as I do with my husband. Most people spend years picking a significant other but only meet/speak with an advisor for about an hour before picking which college to go to. Its important you like the lab you work in as it is a long term (4+ year) commitment.
A poor fit with an advisor can add years to the amount of time you are in graduate school.