I'm exactly the same as you, Rick.

For me, it does not feel like my brain is chaotic. It instead seems as if certain connections are missing, and I need to supply new ones.

Last night I was 'walking' in my living room with just a night light on and I could barely walk at all, even though I certainly know that turf well. I must have the visual cues I get from looking at the floor. Without it I walked in a typical PD way as if I were in a much later stage. Very slow short steps and my arms held in that weird PD way. Very unstable, balance poor.

But, turn the light on and I'm much better instantly.

Oh, I missed my 300th post. I hope is was a good one.

~Zucchini