Table 1. Questions addressed by STN spike-to-cortical gamma phase coupling analyses.

Figure	Question	Finding
Figure 2:	Is it most pronounced over motor cortex?	Yes
Figure 3A:	Is it frequency- and time-specific?	Yes
Figure 3C:	Is the average firing rate across all units significantly modulated?	No
Figure 4:	Are faster reaction times linked to stronger coupling?	Yes
Figure 5:	Is the probability of spikes significantly modulated relative to the cortical gamma phase
	during contra- and ipsilateral gripping?	Yes
Figure 6:	Do we find a systematic phase offset of the average timing of STN spikes relative
	to the cortical gamma phase between contra- and ipsilateral gripping?	Yes