title: Differential effects of escitalopram on attention: a placebo-controlled, double-blind cross-over study.
abstract: BACKGROUND
  The role of serotonin (5-HT) in attention is not fully understood yet.
  
  
  OBJECTIVE
  We aimed to investigate whether attention is modulated after treatment with escitalopram, a selective serotonin reuptake inhibitor (SSRI).
  
  
  METHODS
  We administered 10 mg of escitalopram to 20 healthy subjects in a placebo-controlled, double-blind cross-over design for 1 day or to another 20 participants for a period of 7 days. Attention was assessed at time of plasma peak escitalopram concentration using the computerised Attention Network Test (ANT), which is a combined flanker and cued reaction time task.
  
  
  RESULTS
  The results showed differential effects of serotonergic manipulation on attention depending on sequence of intake. For the acute treatment, we found significant differences between escitalopram and placebo for all warning conditions dependent of sequence of intake: participants receiving escitalopram as first treatment showed significant slower reaction times in all warning conditions as compared with placebo while participants receiving escitalopram as second treatment showed significant faster reaction times as compared with placebo. For the sub-chronic treatment, we found significant differences between escitalopram and placebo depending on sequence of intake, but only for the flanker condition: participants receiving escitalopram first had significant slower reaction times in incongruent trials with escitalopram as compared with placebo while participants starting with placebo had significant shorter reaction times in incongruent trials with escitalopram.
  
  
  CONCLUSIONS
  Thus, the results showed a differential effect of escitalopram in cognition, especially in attention, and are discussed with regard to an interaction between serotonin and familiarity with the attention test.
authors.affiliation: Department of Medical Psychology and Medical Sociology, RWTH Aachen University, Pauwelsstr. 30, 52074, Aachen, Germany. bdrueke@ukaachen.de
authors.forename: Barbara
authors.initials: B
authors.lastname: Drueke
authors.forename: Julia
authors.initials: J
authors.lastname: Baetz
authors.forename: Maren
authors.initials: M
authors.lastname: Boecker
authors.forename: Olaf
authors.initials: O
authors.lastname: Moeller
authors.forename: Christoph
authors.initials: C
authors.lastname: Hiemke
authors.forename: Gerd
authors.initials: G
authors.lastname: Gründer
authors.forename: Siegfried
authors.initials: S
authors.lastname: Gauggel
mesh_terms: D000293:Adolescent; D000328:Adult; D001288:Attention / Q000187:drug effects*; D015283:Citalopram / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D006801:Humans; D008297:Male; D011930:Reaction Time / Q000187:drug effects; D012701:Serotonin / Q000378:metabolism*; D017367:Selective Serotonin Reuptake Inhibitors / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000494:pharmacology*; D055815:Young Adult
chemical_list: D015283:Citalopram; D012701:Serotonin; D017367:Selective Serotonin Reuptake Inhibitors