This may be too technical for this list, but there seems to be some technical people here. Also realize I'm looking at this from the perspective of an electrical engineer, not a biologist. My observation of tremors is that they are at a frequency between 3 and 4 Hz, which is within the frequency of delta brain waves (0 to 4 Hz). I don't have direct experience with dyskinesia, but its periodic motion appears to have a longer period (slower frequency). It isn't easy to find videos that actually show dyskinesia, but Michael J. Fox's dyskinesia is about 1 Hz and isn't always periodic. Is there an explanation for these frequency relationships that can help explain PD.
Appendix: The 5 Different Brainwave Frequencies and What They Mean
"These [delta] waves are also interconnected with proper digestion, regular heart beat and proper blood pressure."
What is the function of the various brainwaves?
"The final brainwave state is delta. Here the brainwaves are of the greatest amplitude and slowest frequency. They typically center around a range of 1.5 to 4 cycles per second. They never go down to zero because that would mean that you were brain dead. But, deep dreamless sleep would take you down to the lowest frequency. Typically, 2 to 3 cycles a second."
"Research has shown that although one brainwave state may predominate at any given time, depending on the activity level of the individual, the remaining three brain states are present in the mix of brainwaves at all times. In other words, while somebody is an aroused state and exhibiting a beta brainwave pattern, there also exists in that person's brain a component of alpha, theta and delta, even though these may be present only at the trace level."