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% of basal GABA release

160. 140. 120. 100. 80. 60. 40. 20. 0. 140. 120. 100. 80. 60. 40. 20. 0. -60. -60. -40. -40. -20. -20. 0. 0. 20. 20. 40. 40. 60. 60. 80. 80. 100. 100. A. B. *. % of basal glutamate release. SC. PAG. AP : -7.3 mm. Time (min). C. % of basal

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% of basal GABA release

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  1. 160 140 120 100 80 60 40 20 0 140 120 100 80 60 40 20 0 -60 -60 -40 -40 -20 -20 0 0 20 20 40 40 60 60 80 80 100 100 A B * % of basal glutamate release SC PAG AP : -7.3 mm Time (min) C % of basal GABA release PF AP: - 4.16 mm Time (min) Figure 1: A. Effects of intracollicular injection (arrow) of picrotoxin (33 pmole/side, black diamonds) on the mean ± SEM of percentage of basal release of glutamate (upper graph) and GABA (lower graph) as compared to saline injection (open squares). * p< 0.05 picrotoxin vs saline, ANOVA, n=4. B. Reconstruction of the injection sites in the caudal superior colliculus on an identified coronal section modified from the atlas of Paxinos and Watson. PAG : periaqueductal grey; SC : superior colliculus. C. Reconstruction of the location of the dialysis probes in the parafascicular nucleus on an identified coronal section modified from the atlas of Paxinos and Watson. PF : n. parafascicularis; VPM : ventroposteromedial nucleus of the thalamus.

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