Table 2.

β-EP immunoactivities induced by different frequencies in the CNS (mean ± SD, n = 7).

Nuclei and areas	Sham control	0 Hz	2 Hz	40 Hz	60 Hz	100 Hz	Correlation coefficients
ACB	10.57 ± 1.48d	9.25 ± 0.44d	12.21 ± 2.00c	21.01 ± 1.80b	27.61 ± 1.91a	18.70 ± 1.21b	0.891**
CAU	20.90 ± 1.99c	20.84 ±3.87c	24.05 ± 2.99bc	36.60 ± 2.17a	36.99 ± 2.28a	26.81 ± 2.41b	0.835**
SA	21.04 ± 2.03d	20.65 ± 3.58d	29.58 ± 2.66c	42.08 ± 4.24b	49.52 ± 3.02a	31.25 ± 3.21c	0.893**
AMY	18.46 ± 2.45d	18.21 ± 3.33d	32.95 ± 4.16c	53.15 ± 2.74ab	54.59 ± 3.09a	48.86 ± 3.66b	0.840**
SON	29.31 ± 1.52c	28.88 ± 2.37c	38.18 ± 5.30b	53.13 ± 2.60a	52.68 ± 2.10a	51.25 ± 1.87a	0.783**
ARC	33.45 ± 2.11a	33.42 ± 2.34a	35.13 ± 2.02a	26.83 ± 1.13bc	23.76 ± 2.74c	28.83 ± 2.63b	0.795**
VMH	19.81 ± 2.10e	18.86 ± 1.79e	34.41 ± 2.82d	56.30 ± 3.77b	61.17 ± 2.35a	47.94 ± 1.66c	0.897**
HB	17.57 ± 2.42c	16.12 ± 1.63c	18.44 ± 1.49c	22.59 ± 2.05b	26.37 ± 1.20a	27.46 ± 1.30a	0.647**
PAG	8.40 ± 0.96d	8.22 ± 1.23d	19.04 ± 1.74c	28.82 ± 3.82b	33.70 ± 3.36a	30.18 ± 3.55ab	0.871**
DR	18.63 ± 1.83d	17.82 ± 2.34d	29.07 ± 1.94c	34.06 ± 3.09ab	38.43 ± 3.45a	31.10 ± 3.09bc	0.808**
LC	14.90 ± 2.21d	13.72 ± 2.95d	21.01 ± 2.37c	30.13 ± 2.66b	35.14 ± 2.42a	30.35 ± 1.80b	0.855**
PBN	7.65 ± 1.19b	7.54 ± 1.44b	8.69 ± 0.99b	14.07 ± 2.85a	14.92 ± 1.96a	7.99 ± 1.15b	0.790**
NRM	17.37 ± 2.20c	16.52 ± 2.23c	17.93 ± 1.21c	23.50 ± 1.65b	30.25 ± 2.91a	24.89 ± 1.76b	0.779**
SOL	11.50 ± 1.02e	11.35 ± 0.88e	23.41 ± 2.46d	33.83 ± 3.64c	49.46 ± 1.42a	43.59 ± 2.17b	0.928**
SCD	7.25 ± 1.13d	6.80 ± 0.26d	10.91 ± 1.00c	14.42 ± 1.18b	17.72 ± 1.03a	10.30 ± 1.26c	0.795**

ACB: nucleus accumbens, SA: septal area, CAU: caudate nucleus, AMY: amygdala, SON: supraoptic nucleus, ARC: arcuate nucleus, LC: locus ceruleus, PAG: periaqueductal gray, DR: dorsal raphe nucleus, PBN: parabrachial nucleus, HB: habenular nucleus, NRM: nucleus raphe, SOL: solitary nucleus, VMH: ventromedial nucleus of hypothalamus magnus, SCD: spinal cord dorsal horn.