left/right perceptions

I remember reading back in my student years that there are neurons in the visual system that seem to be involved in our perception of left and right, and also in our North/East/South/West orientations. For example, lesions in the left/right centers of the brain result in people neglecting the left or right side of the world (they will not eat food on the left/right side of their plates, they will not groom the left/right side of their face, etc.). Also, I've heard of a little autistic girl who would not face North (actually, I forget which orientation it was, but it was one of North, East, South, or West - but let's say it was North). You could spin in circles with her, and consistently, whenever her orientation faced North she ducked her head.

Does anybody know what part of the brain is involved in this?