TY - JOUR
T1 - Concurrent cognitive control training augments the antidepressant efficacy of tDCS: a pilot study
AU - Segrave, Rebecca Anne
AU - Arnold, Sara
AU - Hoy, Kate Elizabeth
AU - Fitzgerald, Paul Bernard
PY - 2014
Y1 - 2014
N2 - Background Major depressive disorder (MDD) is frequently associated with underactivity of the dorsolateral prefrontal cortex (DLPFC) which has led to this brain region being identified as an important target for the development of neurobiological treatments. Transcranial direct current stimulation (tDCS) administered to the DLPFC has antidepressant efficacy, however the magnitude of antidepressant outcomes are limited. Concurrent cognitive activity has been shown to enhance tDCS induced stimulation effects. Cognitive control training (CCT) is a new cognitive therapy for MDD that aims to enhance DLPFC activity via behavioral methods. Hypothesis We tested the hypothesis that co-administration of DLPFC tDCS and CCT would result in a greater reduction in depressive symptomology than administration of tDCS or CCT alone. Methods 27 adult participants with MDD were randomized into a three-arm sham-controlled between-groups pilot study comparing the efficacy of 2 mA tDCS + CCT, sham tDCS + CCT and sham CCT + 2 mA tDCS (5 sessions administered on consecutive working days). Blinded assessments of depression severity and cognitive control were conducted at baseline, end of treatment and a three week follow up review. Results All three treatment conditions were associated with a reduction in depression severity at the end of five treatment sessions. However, only administration of tDCS + CCT resulted in sustained antidepressant response at follow up, the magnitude of which was greater than that observed immediately following conclusion of the treatment course. Conclusions The results provide preliminary evidence that concurrent CCT enhances antidepressant outcomes from tDCS. In the current sample, participants receiving concurrent tDCS and CCT continued to improve following cessation of treatment. The clinical superiority of a combined therapeutic approach was apparent even in a small sample and following a relatively short treatment course. ? 2014 Elsevier Inc.
AB - Background Major depressive disorder (MDD) is frequently associated with underactivity of the dorsolateral prefrontal cortex (DLPFC) which has led to this brain region being identified as an important target for the development of neurobiological treatments. Transcranial direct current stimulation (tDCS) administered to the DLPFC has antidepressant efficacy, however the magnitude of antidepressant outcomes are limited. Concurrent cognitive activity has been shown to enhance tDCS induced stimulation effects. Cognitive control training (CCT) is a new cognitive therapy for MDD that aims to enhance DLPFC activity via behavioral methods. Hypothesis We tested the hypothesis that co-administration of DLPFC tDCS and CCT would result in a greater reduction in depressive symptomology than administration of tDCS or CCT alone. Methods 27 adult participants with MDD were randomized into a three-arm sham-controlled between-groups pilot study comparing the efficacy of 2 mA tDCS + CCT, sham tDCS + CCT and sham CCT + 2 mA tDCS (5 sessions administered on consecutive working days). Blinded assessments of depression severity and cognitive control were conducted at baseline, end of treatment and a three week follow up review. Results All three treatment conditions were associated with a reduction in depression severity at the end of five treatment sessions. However, only administration of tDCS + CCT resulted in sustained antidepressant response at follow up, the magnitude of which was greater than that observed immediately following conclusion of the treatment course. Conclusions The results provide preliminary evidence that concurrent CCT enhances antidepressant outcomes from tDCS. In the current sample, participants receiving concurrent tDCS and CCT continued to improve following cessation of treatment. The clinical superiority of a combined therapeutic approach was apparent even in a small sample and following a relatively short treatment course. ? 2014 Elsevier Inc.
UR - http://www.sciencedirect.com/science/article/pii/S1935861X13003999
U2 - 10.1016/j.brs.2013.12.008
DO - 10.1016/j.brs.2013.12.008
M3 - Article
SN - 1935-861X
VL - 7
SP - 325
EP - 331
JO - Brain Stimulation
JF - Brain Stimulation
IS - 2
ER -