Abstract
Processes of focused attention allow to focus the stream of attention on a specific visual stimulus from the environmental context. The posterior parietal cortex (PPC, Posterior Parietal Cortex) is a region of the cortex engaged in focused attention processes, related to the search for goals of a specific visual context. Transcranial magnetic stimulation with a series of stimuli (repetitive transcranial magnetic stimulation - rTMS) is a method of modulating brain plasticity. We have investigated the effect of rTMS in 20 healthy volunteers. All of them gave written informed consent to the study. rTMS was applied on posterior parietal cortices V1 on both hemispheres with the inhibitory Theta Bursts paradigm with the intensity of 70% of motor threshold. The targets were visualized with the neuronavigation system. Immediately after the stimulation, the functional MRI was performed with the protocol of recognizing of significant military objects from the visual field. In subgroup of participants (n = 15) after the stimulation there were significant reductions in blood flow within V1 cortices. The studies of reaction times after the rTMS also revealed the inhibitory effect of rTMS on the reaction times and recognition performance of significant (military) objects in the visual field. There were no side effects reported by participants and observed by researchers during the whole study.
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