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Gijsman HJ, Van Gerven JM, Verkes RJ, Schoemaker RC, Pieters MS, Pennings EJ, Hessing TJ, Cohen AF. 
“Saccadic peak velocity and EEG as end-points for a serotonergic challenge test”. 
Hum Psychopharmacol. 2002 Oct 29;17(2):83-9.
We previously reported that a single dose of the serotonin receptor agonist meta-chlorophenylpiperazine increased the peak velocity of saccadic eye movements and decreased low-frequency electroencephalographic activity.

METHODS: We administered a single dose of the serotonin releaser dexfenfluramine in a double blind, placebo controlled randomised cross-over design and measured saccadic eye movements and EEG every hour up to 6 h. Subjects were 62 males (18-30 years) with a history of no, moderate or heavy use of ecstasy tablets.

RESULTS: Dexfenfluramine increased saccadic peak velocity and decreased alpha, delta and theta electroencephalographic activity, the latter predominantly in heavy users of ecstasy. CONCLUSIONS: This study supports the idea that saccadic peak velocity and EEG can be useful endpoints of a serotonergic challenge. This could be an important anatomical extension of these end-points, which until now were limited to the effect on hypothalamic serotonergic projections.
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