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Behavioral measurements (mean + SEM) obtained from 16 normal subjects during PET BF scans obtained before (Scan 1), during (Scan 2), and after (Scan 3) the anticipation of a painful shock to the hand. STAI refers to the STAI (21). During Scan 3 (anticipatory anxiety), all three measurements differed significantly (**, P < 0.000001; *, P < 0.0001) from baseline measurements (Scans 1 and 3). For the VAS, Scan 3 was significantly lower than Scan 1 (†, P < 0.05).
