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Figure 4: Region of amygdala activity obtained by subtracting areas of activities between ultrasonic scaling handpiece and 1000-Hz pure sound. (Voxel-level T value = 3.18, Z value = 2.72, P value <0.5)

Figure 4: Region of amygdala activity obtained by subtracting areas of activities between ultrasonic scaling handpiece and 1000-Hz pure sound. (Voxel-level <i>T</i> value = 3.18, <i>Z</i> value = 2.72, <i>P</i> value <0.5)