Modulating Emotion Perception: Opposing Effects of Inhibitory and Excitatory Prefrontal Cortex Stimulation.

BACKGROUND Excitatory repetitive transcranial magnetic stimulation (rTMS) of the left dorsolateral prefrontal cortex (dlPFC) is approved by the U.S. Food and Drug Administration for the treatment of adult patients with treatment-resistant major depressive disorder (MDD). This stimulation is supposed to restore excitability of prefrontal cortex regions that exhibit diminished regulation of emotion-generative systems in MDD. Based on the valence lateralization hypothesis, inhibitory rTMS of the right dlPFC has also been applied in MDD. This approach has proved to be effective, although meta-analyses of emotional perception and affective regulation in healthy control subjects and patients with depression do not support functional asymmetries within dlPFC regions. METHODS To shed more light on this discrepancy, the effects of excitatory and inhibitory rTMS of the right dlPFC on visual emotional perception were compared in two groups of 41 healthy participants overall. Before and after rTMS stimulation, participants viewed fearful and neutral faces while whole-head magnetoencephalography was recorded and supplemented by behavioral tests. RESULTS Visual sensory processing of fearful facial expressions, relative to neutral facial expressions, was reduced after excitatory stimulation and was increased after inhibitory stimulation within right occipital and right temporal regions. Correspondingly, after excitatory rTMS compared with inhibitory rTMS, participants displayed relatively reduced reaction times in an emotion discrimination task and showed reduced emotional arousal. CONCLUSIONS These results support the hypothesis that excitatory rTMS compared with inhibitory rTMS of the right dlPFC strengthens top-down control of aversive stimuli in healthy control subjects, which should encourage more research on mechanisms of excitatory/inhibitory dlPFC-rTMS protocols in general and on neuromodulatory treatment of MDD.

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