Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11033412 | Neuroscience Letters | 2018 | 17 Pages |
Abstract
Repetitive Transcranial Magnetic Stimulation (rTMS) studies are used to test motor imagery hypothesis. Motor Imagery (MI) represents conscious access to contents of movement intention, generally executed unconsciously during motor preparation. The main objective of this study was to investigate electrophysiological changes, which occurred before and after low-frequency rTMS application when we compared three different tasks: execution, action observation and motor imagery of finger movement. We hypothesize that absolute theta power over frontal regions would change between sensorimotor integration tasks and after 1âHz of rTMS application. Eleven healthy, right-handed volunteers of both sexes (5 males, 6 females; mean age 28â±â5 years), with no history of psychiatric or neurological disorders, participated in the experiment. After performing the tasks randomly, subjects were submitted to 15âmin of low-frequency rTMS applied on Superior Parietal Cortex (SPC) and performed the tasks again. All tasks were executed simultaneously with Eletroencephalography (EEG) signals recording. Our results clarified the specificity of each sub-region during MI activity. Frontopolar cortex presented involvement with motor process and showed main effect for task and moment. Inferior frontal gyrus presented involvement with long-term memory retrieval and showed interaction between task and moment in the left hemisphere while the right hemisphere showed a main effect for task and moment. The lack of the main effect for conditions on the anterior frontal cortex collaborates with the hypothesis that in this region an integrated circuit of performance monitoring exists.
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Authors
Jessé Di Giacomo, Mariana Gongora, Farmy Silva, Renan Vicente, Oscar Arias-Carrion, Marco Orsini, Silmar Teixeira, Mauricio Cagy, Bruna Velasques, Pedro Ribeiro,