TABLE 4.

Differences of percent amplitude of fluctuation (PerAF) values in three frequency bands among the groups.

Contrast	Brain regions	BA	Volume (mm3)	MNI coordinates			t-value
				X	Y	Z
1. Conventional frequency band
PD-A vs. HCs	PD-A > HCs
	right middle temporal gyrus	22	2565	51	−36	6	4.4
	PD-A < HCs
	right anterior cingulate gyri	32	8208	6	45	24	−4.8
PD-A vs. PD-NA	NA
PD-NA vs. HCs	PD-NA < HCs
	right superior frontal gyrus, medial	8	2160	3	36	45	−4.1
2. Slow-4 band
PD-A vs. HCs	PD-A < HCs
	left supplementary motor area	32	4995	−6	15	45	−4.6
	right middle frontal gyrus	46	2781	33	30	36	−4.3
PD-A vs. PD-NA	NA
PD-NA vs. HCs	NA
3. Slow-5 band
PD-A vs. HCs	PD-A > HCs
	right middle temporal gyrus	22	3375	57	−33	6	5.0
	PD-A < HCs
	right anterior cingulate gyri	32	4806	3	45	24	−4.5
PD-A vs. PD-NA	NA
PD-NA vs. HCs	NA

BA, Brodmann’s area; MNI, Montreal Neurological Institute; PD-A, Parkinson’s disease with apathy; PD-NA, Parkinson’s disease without apathy; HCs, healthy controls; NA, Not applicable; - no significant clusters detected.