Previous studies showed that anodal tDCS applied over the dorsolateral prefrontal cortex (DLPFC) improved episodic memory performance, indicating a possible use as an intervention for patients suffering from memory impairments. At the same time, only scant evidence (provided by functional magnetic resonance imaging (fMRI) and magnetic resonance spectroscopy (MRS)) exists regarding the underlying mechanisms, thus hindering a more targeted application. The present study aims at establishing a connection between the stimulation-induced change in episodic memory performance on the behavioural level and neurophysiological parameters. TDCS effects and the underlying mechanisms will be compared between different study conditions, receiving either real anodal tDCS or sham stimulation over the left dorsolateral prefrontal cortex during an episodic memory task.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
DOUBLE
Enrollment
55
The MR-compatible neuroConn DC-Stimulator MR (neuroCare Group, Ilmenau, Germany) will be used in the study.
The MR-compatible neuroConn DC-Stimulator MR (neuroCare Group, Ilmenau, Germany) will be used in the study.
University Hospital of Old Age Psychiatry and Psychotherapy
Bern, Switzerland
Episodic memory performance - learning curve
Number of encoded words during the three consecutive immediate retrievals in the encoding phase
Time frame: 0.25 hours
Episodic memory performance - delayed recall 1
Number of remembered words in the delayed recall after a short delay at the day of the on-site visit
Time frame: 20 min after encoding phase
Episodic memory performance - delayed recall 2
Number of remembered words one day after learning
Time frame: 1 day after on-site visit
Neurotransmitter levels
Changes in neurotransmitter levels (gamma-Aminobutyric acid (GABA) and glutamatergic metabolites (Glx) due to tDCS (comparing pre- and post-stimulation measurements in DLPFC)
Time frame: 0.5 hours
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