title: Modulation of attention network activation under antidepressant agents in healthy subjects.
abstract: While antidepressants are supposed to exert similar effects on mood and drive via various mechanisms of action, diverging effects are observed regarding side-effects and accordingly on neural correlates of motivation, emotion, reward and salient stimuli processing as a function of the drugs impact on neurotransmission. In the context of erotic stimulation, a unidirectional modulation of attentional functioning despite opposite effects on sexual arousal has been suggested for the selective serotonin reuptake-inhibitor (SSRI) paroxetine and the selective dopamine and noradrenaline reuptake-inhibitor (SDNRI) bupropion. To further elucidate the effects of antidepressant-related alterations of neural attention networks, we investigated 18 healthy males under subchronic administration (7 d) of paroxetine (20 mg), bupropion (150 mg) and placebo within a randomized placebo-controlled cross-over double-blind functional magnetic resonance imaging (fMRI) design during an established preceding attention task. Neuropsychological effects beyond the fMRI-paradigm were assessed by measuring alertness and divided attention. Comparing preceding attention periods of salient vs. neutral pictures, we revealed congruent effects of both drugs vs. placebo within the anterior midcingulate cortex, dorsolateral prefrontal cortex, anterior prefrontal cortex, superior temporal gyrus, anterior insula and the thalamus. Relatively decreased activation in this network was paralleled by slower reaction times in the divided attention task in both verum conditions compared to placebo. Our results suggest similar effects of antidepressant treatments on behavioural and neural attentional functioning by diverging neurochemical pathways. Concurrent alterations of brain regions within a fronto-parietal and cingulo-opercular attention network for top-down control could point to basic neural mechanisms of antidepressant action irrespective of receptor profiles.
authors.affiliation: Department of Psychiatry, Ulm University, Ulm, Germany. heiko.graf@uni-ulm.de
authors.forename: Heiko
authors.initials: H
authors.lastname: Graf
authors.forename: Birgit
authors.initials: B
authors.lastname: Abler
authors.forename: Antonie
authors.initials: A
authors.lastname: Hartmann
authors.forename: Coraline D
authors.initials: CD
authors.lastname: Metzger
authors.forename: Martin
authors.initials: M
authors.lastname: Walter
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D000928:Antidepressive Agents / Q000494:pharmacology*; D001288:Attention / Q000187:drug effects*; D001921:Brain / Q000098:blood supply / Q000187:drug effects*; D001931:Brain Mapping; D016642:Bupropion / Q000494:pharmacology*; D018592:Cross-Over Studies; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D009483:Neuropsychological Tests; D010100:Oxygen; D017374:Paroxetine / Q000494:pharmacology*; D010775:Photic Stimulation; D011930:Reaction Time; D011795:Surveys and Questionnaires; D055815:Young Adult
chemical_list: D000928:Antidepressive Agents; D016642:Bupropion; D017374:Paroxetine; D010100:Oxygen