Brand Logo & Favicon

Looking to have a favicon and brand logo created for my website. I would like to have it completed before the end of the week (i.e. 27th Jan). The logo is required to be simple and related to the field of neuroscience (i.e. think brains, neurons, connections, etc). I'm not overly concerned with the colour, but I like blue.

I have attached a file to the website as a reference.