Abstract:
BACKGROUND:Increased self-focus and negative self-concept play an important role in depression. Antidepressants influence self-referential processing in healthy volunteers, but their function in self-processing of depressed patients remains unknown. METHODS:Thirty-two depressed patients were randomly allocated to receive either escitalopram 10 mg or placebo for one week. After one week, neural responses to positive and negative self-referential adjectives and neutral control stimuli were assessed with functional magnetic resonance imaging. A group of matched healthy volunteers served as a control group. RESULTS:Escitalopram decreased responses of medial fronto-parietal regions to self-referential words relative to non-emotional control stimuli, driven by increased responses to the control condition. Escitalopram also increased responses in the pre-defined region of the medial prefrontal cortex (MPFC) and the anterior cingulate cortex (ACC) to positive relative to negative words. Importantly, the changes in neural responses occurred before any effect on depressive symptoms, implying a direct effect of escitalopram. Furthermore, the placebo group had decreased responses of the MPFC and the ACC to positive self-referential processing relative to the matched healthy controls. However, neural responses of the escitalopram group and the healthy unmedicated controls were similar. LIMITATIONS:Differences between the groups in self-reported depression symptoms and personality traits may have influenced the results. CONCLUSION:One-week treatment with escitalopram normalized aberrant self-referential processing in depressed patients, shifting the focus from the self to the external environment and potentiating positive self-referential processing. This may be an important factor in mechanism of action of antidepressants.
journal_name
J Affect Disordjournal_title
Journal of affective disordersauthors
Komulainen E,Heikkilä R,Nummenmaa L,Raij TT,Harmer CJ,Isometsä E,Ekelund Jdoi
10.1016/j.jad.2018.04.096subject
Has Abstractpub_date
2018-08-15 00:00:00pages
222-229eissn
0165-0327issn
1573-2517pii
S0165-0327(17)32281-4journal_volume
236pub_type
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