The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform
Ksenija Jaušovec - One of the best experts on this subject based on the ideXlab platform.
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The influence of theta transcranial alternating current stimulation (tACS) on working memory storage and processing functions
Acta psychologica, 2013Co-Authors: Norbert Jaušovec, Ksenija Jaušovec, Anja PahorAbstract:Abstract The study aimed to explore the role of the fronto-parietal brain network in working memory function—in temporary storage and manipulation of information. In a single blind sham controlled experiment 36 respondents solved different working memory tasks after theta transcranial alternating current stimulation (tACS) was applied to left frontal, left parietal and right parietal areas. Both verum tACS protocols stimulating parietal brain areas (Target Electrodes positioned at location P3, or P4) had a positive effect on WM storage capacity as compared with sham tACS, whereas no such influence was observed for the stimulation of the left frontal area (Target Electrode positioned at location F3). A second finding was that left parietal theta tACS had a more pronounced influence on backward recall than on forward recall, which was not related to task content (spatial or verbal). The influence of theta tACS on WM executive processes was most pronounced for right parietal stimulation. The results are discussed in the broad theoretical framework of the multicomponent model of working memory.
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Increasing working memory capacity with theta transcranial alternating current stimulation (tACS).
Biological psychology, 2013Co-Authors: Norbert Jaušovec, Ksenija JaušovecAbstract:The study aimed to investigate the influence of transcranial alternating current stimulation (tACS) on working memory's (WM) storage capacity. Sham/verum tACS with individually determined theta frequency was applied to the left parietal (Target Electrode=P3) or frontal (Target Electrode=F3) brain areas (return Electrode above the right eyebrow). After sham and verum stimulation, 24 respondents solved a task measuring the scope of attention while their electroencephalogram (EEG) was recorded. Verum tACS with the Target Electrode positioned over the left parietal brain area significantly increased WM storage capacity, as compared to sham tACS. No such influence was observed for tACS with the Target Electrode positioned over the left frontal area. Increased WM storage capacity was accompanied by event-related potential (ERP) P300 latency decrease in the left hemisphere. The obtained behavioral and neuroelectric data emphasize the causal relationship between WM storage capacity and theta frequency oscillations in the left parietal brain area.
Norbert Jaušovec - One of the best experts on this subject based on the ideXlab platform.
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The influence of theta transcranial alternating current stimulation (tACS) on working memory storage and processing functions
Acta psychologica, 2013Co-Authors: Norbert Jaušovec, Ksenija Jaušovec, Anja PahorAbstract:Abstract The study aimed to explore the role of the fronto-parietal brain network in working memory function—in temporary storage and manipulation of information. In a single blind sham controlled experiment 36 respondents solved different working memory tasks after theta transcranial alternating current stimulation (tACS) was applied to left frontal, left parietal and right parietal areas. Both verum tACS protocols stimulating parietal brain areas (Target Electrodes positioned at location P3, or P4) had a positive effect on WM storage capacity as compared with sham tACS, whereas no such influence was observed for the stimulation of the left frontal area (Target Electrode positioned at location F3). A second finding was that left parietal theta tACS had a more pronounced influence on backward recall than on forward recall, which was not related to task content (spatial or verbal). The influence of theta tACS on WM executive processes was most pronounced for right parietal stimulation. The results are discussed in the broad theoretical framework of the multicomponent model of working memory.
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Increasing working memory capacity with theta transcranial alternating current stimulation (tACS).
Biological psychology, 2013Co-Authors: Norbert Jaušovec, Ksenija JaušovecAbstract:The study aimed to investigate the influence of transcranial alternating current stimulation (tACS) on working memory's (WM) storage capacity. Sham/verum tACS with individually determined theta frequency was applied to the left parietal (Target Electrode=P3) or frontal (Target Electrode=F3) brain areas (return Electrode above the right eyebrow). After sham and verum stimulation, 24 respondents solved a task measuring the scope of attention while their electroencephalogram (EEG) was recorded. Verum tACS with the Target Electrode positioned over the left parietal brain area significantly increased WM storage capacity, as compared to sham tACS. No such influence was observed for tACS with the Target Electrode positioned over the left frontal area. Increased WM storage capacity was accompanied by event-related potential (ERP) P300 latency decrease in the left hemisphere. The obtained behavioral and neuroelectric data emphasize the causal relationship between WM storage capacity and theta frequency oscillations in the left parietal brain area.
Anja Pahor - One of the best experts on this subject based on the ideXlab platform.
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The influence of theta transcranial alternating current stimulation (tACS) on working memory storage and processing functions
Acta psychologica, 2013Co-Authors: Norbert Jaušovec, Ksenija Jaušovec, Anja PahorAbstract:Abstract The study aimed to explore the role of the fronto-parietal brain network in working memory function—in temporary storage and manipulation of information. In a single blind sham controlled experiment 36 respondents solved different working memory tasks after theta transcranial alternating current stimulation (tACS) was applied to left frontal, left parietal and right parietal areas. Both verum tACS protocols stimulating parietal brain areas (Target Electrodes positioned at location P3, or P4) had a positive effect on WM storage capacity as compared with sham tACS, whereas no such influence was observed for the stimulation of the left frontal area (Target Electrode positioned at location F3). A second finding was that left parietal theta tACS had a more pronounced influence on backward recall than on forward recall, which was not related to task content (spatial or verbal). The influence of theta tACS on WM executive processes was most pronounced for right parietal stimulation. The results are discussed in the broad theoretical framework of the multicomponent model of working memory.
Kim J. Burchiel - One of the best experts on this subject based on the ideXlab platform.
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Verification of the Deep Brain Stimulation Electrode Position Using Intraoperative Electromagnetic Localization.
Stereotactic and functional neurosurgery, 2020Co-Authors: Kim J. Burchiel, Michael Kinsman, Kevin Mansfield, Ann MitchellAbstract:BACKGROUND Electromagnetic (EM) localization has typically been used to direct shunt catheters into the ventricle. The objective of this study was to determine if this method of EM tracking could be used in a deep brain stimulation (DBS) Electrode cannula to accurately predict the eventual location of the Electrode contacts. METHODS The Medtronic AxiEMTM system was used to generate the cannula tip location directed to the planned Target site. Prior to clinical testing, a series of phantom modelling observations were made. RESULTS Phantom trials (n = 23) demonstrated that the cannula tip could be accurately located at the Target site with an error of between 0.331 ± 0.144 and 0.6 ± 0.245 mm, depending on the orientation of the delivery system to the axis of the phantom head. Intraoperative EM localization of the DBS cannula was performed in 84 trajectories in 48 patients. The average difference between the planned Target and the EM stylet location at the cannula tip was 1.036 ± 0.543 mm. The average error between the planned Target coordinates and the actual Target Electrode location (by CT) was 1.431 ± 0.607 and 1.145 ± 0.636 mm for the EM stylet location in the cannula (p = 0.00312), indicating that EM localization reflected the position of the Target Electrode more accurately than the planned Target. CONCLUSIONS EM localization can be used to verify the position of DBS Electrodes intraoperatively with a high accuracy.
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Computed tomography-guided percutaneous trigeminal tractotomy-nucleotomy: Commentary
Neurosurgery, 2008Co-Authors: Kim J. BurchielAbstract:OBJECTIVE: The destruction of the descending trigeminal tractus in the medulla is known as trigeminal tractotomy (TR), whereas the lesioning of the nucleus caudalis is known as trigeminal nucleotomy (NC). Trigeminal TR and/or NC procedures can be used in a large group of pain syndromes, such as glossopharyngeal, vagal, and geniculate neuralgias, atypical facial pain, craniofacial cancer pain, postherpetic neuralgias, and atypical forms of trigeminal neuralgia. METHODS: In this study, anatomic and technical details of the procedure and the experience gained from 65 patients over the course of 20 years are discussed. Patients' pain scores and Karnofsky Performance Scale scores were evaluated pre- and postoperatively (postoperative Day 1). RESULTS: The best results were obtained in the second-largest group (vagoglossopharyngeal neuralgia, n = 17) and in geniculate neuralgia (n = 4). Patients with atypical facial pain (n = 21; 13 women, eight men) accounted for the largest group to undergo computed tomography-guided TR-NC surgery; pain relief was achieved in 19 of these patients. In the third-largest group (craniofacial and oral cancer pain, n = 13), 11 of 13 patients were successfully treated with TR-NC. Four of five patients with failed trigeminal neuralgia were also effectively treated with TR-NC. CONCLUSION: We propose that computed tomography-guided TR-NC provides direct visualization of the Target-Electrode relation and can be considered a first-step procedure in patient management. In view of its high efficacy, low complication rate, and minimal invasiveness, computed tomography-guided trigeminal TR-NC is a safe and effective procedure in the treatment of intractable facial pain syndromes.
Atilla Halil Elhan - One of the best experts on this subject based on the ideXlab platform.
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computed tomography guided percutaneous trigeminal tractotomy nucleotomy
Neurosurgery, 2008Co-Authors: Yücel Kanpolat, Gokmen Kahilogullari, Hasan Caglar Ugur, Atilla Halil ElhanAbstract:OBJECTIVE: The destruction of the descending trigeminal tractus in the medulla is known as trigeminal tractotomy (TR), whereas the lesioning of the nucleus caudalis is known as trigeminal nucleotomy (NC). Trigeminal TR and/or NC procedures can be used in a large group of pain syndromes, such as glossopharyngeal, vagal, and geniculate neuralgias, atypical facial pain, craniofacial cancer pain, postherpetic neuralgias, and atypical forms of trigeminal neuralgia. METHODS: In this study, anatomic and technical details of the procedure and the experience gained from 65 patients over the course of 20 years are discussed. Patients' pain scores and Karnofsky Performance Scale scores were evaluated pre- and postoperatively (postoperative Day 1). RESULTS: The best results were obtained in the second-largest group (vagoglossopharyngeal neuralgia, n = 17) and in geniculate neuralgia (n = 4). Patients with atypical facial pain (n = 21; 13 women, eight men) accounted for the largest group to undergo computed tomography-guided TR-NC surgery; pain relief was achieved in 19 of these patients. In the third-largest group (craniofacial and oral cancer pain, n = 13), 11 of 13 patients were successfully treated with TR-NC. Four of five patients with failed trigeminal neuralgia were also effectively treated with TR-NC. CONCLUSION: We propose that computed tomography-guided TR-NC provides direct visualization of the Target-Electrode relation and can be considered a first-step procedure in patient management. In view of its high efficacy, low complication rate, and minimal invasiveness, computed tomography-guided trigeminal TR-NC is a safe and effective procedure in the treatment of intractable facial pain syndromes.
