Table 4. Significant correlations between a decreased SWJ velocity/amplitude ratio and areas with reduced brain volumes in PSP and PD patients.

	SWJ recording condition	Side	Area	MNI			Cluster size	t
				x	y	z
PSP	Target on	Left	Inferior temporal gyrus	−38	−5	−42	243	15.71
		Right	Superior parietal gyrus	21	−56	72	21	10.26
		Left	Fusiform gyrus	−42	−54	−8	16	9.26
		Left	Precuneus	−14	−71	54	24	9.00
		Left	Middle temporal gyrus	−57	−56	18	23	8.79
		Right	Cuneus	5	−83	27	31	8.56
		Left	Precentral gyrus	−50	−5	23	25	7.94
	Target off	Right	Middle occipital gyrus	39	−74	2	17	8.99
		Left	Middle frontal gyrus	−29	44	23	18	8.09
		Right	Superior medial frontal gyrus/superior frontal gyrus	15	66	9	17	7.12
PD	Target on	Right	Cuneus	9	−75	30	101	11.00
		Left	Rolandic operculum	−57	8	0	37	8.54
		Right	Inferior frontal operculum	47	3	26	89	8.52
		Right	Superior medial frontal gyrus/anterior cingulate gyrus	8	54	9	70	7.34
		Right	Inferior temporal gyrus	48	−62	−12	29	6.84
		Right	Inferior operculum frontal/Rolandic operculum	51	6	11	59	6.67
	Target off	Right	Lingual gyrus/calcarine/inferior-middle-superior occipital gyrus	9	−96	−5	889	12.34
		Right	Middle occipital gyrus	45	−77	9	38	7.12
		Left	Cuneus	−9	−78	36	48	7.07
		Left	Inferior occipital gyrus	−18	−92	−9	26	6.21

p<0.001.

MNI: coordinates according to the Montreal Neurological Institute brain atlas, PD: Parkinson's disease, PSP: progressive supranuclear palsy, SWJ: square-wave jerk.