Table 1.

Properties of the three auditory stimuli as obtained by fMRI

Condition	L/R	Z	Region of activation	Brodmann’s area	X, Y, Z	P
Ultrasonic scaling handpiece — base	R	2.93	STG	22	68, −44, 20	0.01
	L	2.38	STG	22	−68, −44, 16
	R	3.07	MFG	10	36, 62, 0
	R	2.12	Amygdala		28, −6, −22
Power suction — base	R	2.23	STG	22	62, −28, 2	0.05
	L	1.71	STG	22	−66, −50, 10
	R	2.02	MFG	10	46, 52, 2
1000 Hz — base	R	2.62	STG	22	64, −20, 0	0.01
	L	2.20	STG	22	−56, −4, −6
	R	2.77	MFG	10	34, 58, −2

STG = Superior temporal gyrus, MFG = Middle frontal gyrus