Cerebral Cortex Advance Access originally published online on December 7, 2005
Cerebral Cortex 2006 16(10):1487-1493; doi:10.1093/cercor/bhj083
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Repetitive Transcranial Magnetic Stimulation Effects on Brain Function and Cognition among Elders with Memory Dysfunction. A Randomized Sham-Controlled Study
1 Department de Psiquiatria i Psicobiologia Clínica, Universitat de Barcelona, 08036 Barcelona, Spain, 2 Institut d'Investigacions Biomèdiques August Pi i Sunyer, Universitat de Barcelona, 08036 Barcelona, Spain, 3 Servei de Neurologia, Hospital Clinic de Barcelona, 08036 Barcelona, Spain, 4 Servei de Radiologia, Hospital Clínic de Barcelona, 08036 Barcelona, Spain, 5 Escola Universitària Gimbernat, Universitat Autònoma de Barcelona, 08174 Sant Cugat del Vallés, Barcelona, Spain, 6 Departament de Biofísica Mèdica, Universitat de Barcelona, 08036 Barcelona, Spain and 7 Laboratori d'Exploracions Neurofuncionals, Servei de Neurologia, Hospital Clínic de Barcelona, 08036 Barcelona, Spain
Address correspondence to Dr David Bartrés-Faz, Departament de Psiquiatria i Psicobiologia Clinica, Facultat de Medicina, Institut d'Investigacions Biomèdiques August Pi i Sunyer, Universitat de Barcelona, 08036 Barcelona, Spain. Email: dbartres{at}ub.edu.
In the present study, we aimed to investigate the effects of repetitive transcranial magnetic stimulation (rTMS) on memory performance and brain activity in elders presenting with subjective memory complaints and a memory performance within the low normal range. Forty participants underwent 2 functional magnetic resonance imaging (fMRI) sessions, in which they were administered 2 equivalent facename memory tasks. Following each fMRI, subjects were asked to pair faces with their corresponding proper name. In-between, high-frequency rTMS was applied randomly using real or sham stimulation in a double-blind design. Only subjects who received active rTMS improved in associative memory significantly. This was accompanied by additional recruitment of right prefrontal and bilaterial posterior cortical regions at the second fMRI session, relative to baseline scanning. Our findings reflect a potentiality of rTMS to recruit compensatory networks, which participate during the memory-encoding process. Present results represent the first evidence that rTMS is capable of transitorily and positively influencing brain function and cognition among elders with memory complaints.
Key Words: associative memory task facename memory encoding functional magnetic resonance imaging repetive transcranial magnetic stimulation