Hi Sammycat,
Welcome to Science Buddies!
I'm very sorry to hear about your partner's concussion. I hope she feels better soon.
You have a really good idea for a science project and you are smart to post your question early so you have time to develop this into a very successful science project. Here is a brain dominance project from the Science Buddies website that you could do, or that you could adapt for a unique project of your own.
https://www.sciencebuddies.org/science- ... #procedure
Is this the experiment that you were thinking about doing? Or, did you have something else in mind? What is the question you are trying to answer with your science project?
For the variables question, check out the science fair project guide from this website for a complete explanation of variables.
https://www.sciencebuddies.org/science- ... ndex.shtml
Basically, you want to design a controlled experiment and change one parameter (independent variable) to find out what happens. Preferably the result (dependent variable) will be something that you can measure.
I hope this helps you get started. Please post again if you have any questions.
Donna Hardy