Psychological Medicine

Original Articles

Increased neural response to fear in patients recovered from depression: a 3T functional magnetic resonance imaging study

R. Norburya1 c1, S. Selvaraja1, M. J. Taylora1, C. Harmera2 and P. J. Cowena1

a1 Psychopharmacology Research Unit (PPRU), University of Oxford, Department of Psychiatry, Oxford, UK

a2 Psychopharmacology and Emotion Research Laboratory (PERL), University of Oxford, Department of Psychiatry, Oxford, UK

Abstract

Background Previous imaging studies have revealed that acute major depression is characterized by altered neural responses to negative emotional stimuli. Typically, responses in limbic regions such as the amygdala are increased while activity in cortical regulatory regions such as the dorsolateral prefrontal cortex (DLPFC) is diminished. Whether these changes persist in unmedicated recovered patients is unclear.

Method We used functional magnetic resonance imaging to examine neural responses to emotional faces in a facial expression-matching task in 16 unmedicated recovered depressed patients and 21 healthy controls.

Results Compared with controls, recovered depressed patients had increased responses bilaterally to fearful faces in the DLPFC and right caudate. Responses in the amygdala did not distinguish the groups.

Conclusions Our findings indicate that clinical recovery from depression is associated with increased activity in the DLPFC to negative emotional stimuli. We suggest that this increase may reflect a compensatory cortical control mechanism with the effect of limiting emotional dysregulation in limbic regions such as the amygdala.

(Received November 24 2008)

(Revised May 22 2009)

(Accepted June 02 2009)

(Online publication July 23 2009)

Correspondence

c1 Address for correspondence: Dr R. Norbury, Psychopharmacology Research Unit (PPRU), University of Oxford, Department of Psychiatry, Neurosciences Building, Warneford Hospital, Headington, Oxford OX3 7JX, UK. (Email: raymond.norbury@psych.ox.ac.uk)

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