Modulating Cortical Hemodynamic Activity in Parkinson's Disease Using Focal Transcranial Direct Current Stimulation: A Pilot Functional Near-infrared Spectroscopy Study
Brain Topogr. 2023 Sep 7. doi: 10.1007/s10548-023-01002-6. Online ahead of print.ABSTRACTReduced thalamocortical facilitation of the motor cortex in PD leads to characteristic motor deficits such as bradykinesia. Recent research has highlighted improved motor function following tDCS, but a lack of neurophysiological evidence limits the progress of tDCS as an adjunctive therapy. Here, we tested the hypothesis that tDCS may modulate M1 hemodynamic activity in PD and healthy using functional near-infrared spectroscopy (fNIRS). In this randomized crossover experiment, fourteen PD and twelve healthy control participants attende...
Source: Brain Topography - September 7, 2023 Category: Neuroscience Authors: Michael W Simpson Margaret Mak Source Type: research
Electrical Source Imaging of Somatosensory Evoked Potentials from Intracranial EEG Signals
Brain Topogr. 2023 Aug 29. doi: 10.1007/s10548-023-00994-5. Online ahead of print.ABSTRACTStereoelectroencephalography (SEEG) records electrical brain activity with intracerebral electrodes. However, it has an inherently limited spatial coverage. Electrical source imaging (ESI) infers the position of the neural generators from the recorded electric potentials, and thus, could overcome this spatial undersampling problem. Here, we aimed to quantify the accuracy of SEEG ESI under clinical conditions. We measured the somatosensory evoked potential (SEP) in SEEG and in high-density EEG (HD-EEG) in 20 epilepsy surgery patients. ...
Source: Brain Topography - August 29, 2023 Category: Neuroscience Authors: Adam Kalina Petr Jezdik Petr Fabera Petr Marusic Jiri Hammer Source Type: research
Electrical Source Imaging of Somatosensory Evoked Potentials from Intracranial EEG Signals
Brain Topogr. 2023 Aug 29. doi: 10.1007/s10548-023-00994-5. Online ahead of print.ABSTRACTStereoelectroencephalography (SEEG) records electrical brain activity with intracerebral electrodes. However, it has an inherently limited spatial coverage. Electrical source imaging (ESI) infers the position of the neural generators from the recorded electric potentials, and thus, could overcome this spatial undersampling problem. Here, we aimed to quantify the accuracy of SEEG ESI under clinical conditions. We measured the somatosensory evoked potential (SEP) in SEEG and in high-density EEG (HD-EEG) in 20 epilepsy surgery patients. ...
Source: Brain Topography - August 29, 2023 Category: Neuroscience Authors: Adam Kalina Petr Jezdik Petr Fabera Petr Marusic Jiri Hammer Source Type: research
Electrical Source Imaging of Somatosensory Evoked Potentials from Intracranial EEG Signals
Brain Topogr. 2023 Aug 29. doi: 10.1007/s10548-023-00994-5. Online ahead of print.ABSTRACTStereoelectroencephalography (SEEG) records electrical brain activity with intracerebral electrodes. However, it has an inherently limited spatial coverage. Electrical source imaging (ESI) infers the position of the neural generators from the recorded electric potentials, and thus, could overcome this spatial undersampling problem. Here, we aimed to quantify the accuracy of SEEG ESI under clinical conditions. We measured the somatosensory evoked potential (SEP) in SEEG and in high-density EEG (HD-EEG) in 20 epilepsy surgery patients. ...
Source: Brain Topography - August 29, 2023 Category: Neuroscience Authors: Adam Kalina Petr Jezdik Petr Fabera Petr Marusic Jiri Hammer Source Type: research
Electrical Source Imaging of Somatosensory Evoked Potentials from Intracranial EEG Signals
Brain Topogr. 2023 Aug 29. doi: 10.1007/s10548-023-00994-5. Online ahead of print.ABSTRACTStereoelectroencephalography (SEEG) records electrical brain activity with intracerebral electrodes. However, it has an inherently limited spatial coverage. Electrical source imaging (ESI) infers the position of the neural generators from the recorded electric potentials, and thus, could overcome this spatial undersampling problem. Here, we aimed to quantify the accuracy of SEEG ESI under clinical conditions. We measured the somatosensory evoked potential (SEP) in SEEG and in high-density EEG (HD-EEG) in 20 epilepsy surgery patients. ...
Source: Brain Topography - August 29, 2023 Category: Neuroscience Authors: Adam Kalina Petr Jezdik Petr Fabera Petr Marusic Jiri Hammer Source Type: research
Electrical Source Imaging of Somatosensory Evoked Potentials from Intracranial EEG Signals
Brain Topogr. 2023 Aug 29. doi: 10.1007/s10548-023-00994-5. Online ahead of print.ABSTRACTStereoelectroencephalography (SEEG) records electrical brain activity with intracerebral electrodes. However, it has an inherently limited spatial coverage. Electrical source imaging (ESI) infers the position of the neural generators from the recorded electric potentials, and thus, could overcome this spatial undersampling problem. Here, we aimed to quantify the accuracy of SEEG ESI under clinical conditions. We measured the somatosensory evoked potential (SEP) in SEEG and in high-density EEG (HD-EEG) in 20 epilepsy surgery patients. ...
Source: Brain Topography - August 29, 2023 Category: Neuroscience Authors: Adam Kalina Petr Jezdik Petr Fabera Petr Marusic Jiri Hammer Source Type: research
Electrical Source Imaging of Somatosensory Evoked Potentials from Intracranial EEG Signals
Brain Topogr. 2023 Aug 29. doi: 10.1007/s10548-023-00994-5. Online ahead of print.ABSTRACTStereoelectroencephalography (SEEG) records electrical brain activity with intracerebral electrodes. However, it has an inherently limited spatial coverage. Electrical source imaging (ESI) infers the position of the neural generators from the recorded electric potentials, and thus, could overcome this spatial undersampling problem. Here, we aimed to quantify the accuracy of SEEG ESI under clinical conditions. We measured the somatosensory evoked potential (SEP) in SEEG and in high-density EEG (HD-EEG) in 20 epilepsy surgery patients. ...
Source: Brain Topography - August 29, 2023 Category: Neuroscience Authors: Adam Kalina Petr Jezdik Petr Fabera Petr Marusic Jiri Hammer Source Type: research
Electrical Source Imaging of Somatosensory Evoked Potentials from Intracranial EEG Signals
Brain Topogr. 2023 Aug 29. doi: 10.1007/s10548-023-00994-5. Online ahead of print.ABSTRACTStereoelectroencephalography (SEEG) records electrical brain activity with intracerebral electrodes. However, it has an inherently limited spatial coverage. Electrical source imaging (ESI) infers the position of the neural generators from the recorded electric potentials, and thus, could overcome this spatial undersampling problem. Here, we aimed to quantify the accuracy of SEEG ESI under clinical conditions. We measured the somatosensory evoked potential (SEP) in SEEG and in high-density EEG (HD-EEG) in 20 epilepsy surgery patients. ...
Source: Brain Topography - August 29, 2023 Category: Neuroscience Authors: Adam Kalina Petr Jezdik Petr Fabera Petr Marusic Jiri Hammer Source Type: research
Automatic Brain Categorization of Discrete Auditory Emotion Expressions
Brain Topogr. 2023 Aug 28. doi: 10.1007/s10548-023-00983-8. Online ahead of print.ABSTRACTSeamlessly extracting emotional information from voices is crucial for efficient interpersonal communication. However, it remains unclear how the brain categorizes vocal expressions of emotion beyond the processing of their acoustic features. In our study, we developed a new approach combining electroencephalographic recordings (EEG) in humans with a frequency-tagging paradigm to 'tag' automatic neural responses to specific categories of emotion expressions. Participants were presented with a periodic stream of heterogeneous non-verba...
Source: Brain Topography - August 28, 2023 Category: Neuroscience Authors: Siddharth Talwar Francesca M Barbero Roberta P Calce Olivier Collignon Source Type: research
Automatic Brain Categorization of Discrete Auditory Emotion Expressions
Brain Topogr. 2023 Aug 28. doi: 10.1007/s10548-023-00983-8. Online ahead of print.ABSTRACTSeamlessly extracting emotional information from voices is crucial for efficient interpersonal communication. However, it remains unclear how the brain categorizes vocal expressions of emotion beyond the processing of their acoustic features. In our study, we developed a new approach combining electroencephalographic recordings (EEG) in humans with a frequency-tagging paradigm to 'tag' automatic neural responses to specific categories of emotion expressions. Participants were presented with a periodic stream of heterogeneous non-verba...
Source: Brain Topography - August 28, 2023 Category: Neuroscience Authors: Siddharth Talwar Francesca M Barbero Roberta P Calce Olivier Collignon Source Type: research
Two-Dimensional Population Receptive Field Mapping of Human Primary Somatosensory Cortex
Brain Topogr. 2023 Aug 27. doi: 10.1007/s10548-023-01000-8. Online ahead of print.ABSTRACTFunctional magnetic resonance imaging can provide detailed maps of how sensory space is mapped in the human brain. Here, we use a novel 16 stimulator setup (a 4 × 4 grid) to measure two-dimensional sensory maps of between and within-digit (D2-D4) space using high spatial-resolution (1.25 mm isotropic) imaging at 7 Tesla together with population receptive field (pRF) mapping in 10 participants. Using a 2D Gaussian pRF model, we capture maps of the coverage of digits D2-D5 across Brodmann areas and estimate pRF size and shape. In addit...
Source: Brain Topography - August 27, 2023 Category: Neuroscience Authors: Michael Asghar Rosa Sanchez-Panchuelo Denis Schluppeck Susan Francis Source Type: research
Two-Dimensional Population Receptive Field Mapping of Human Primary Somatosensory Cortex
Brain Topogr. 2023 Aug 27. doi: 10.1007/s10548-023-01000-8. Online ahead of print.ABSTRACTFunctional magnetic resonance imaging can provide detailed maps of how sensory space is mapped in the human brain. Here, we use a novel 16 stimulator setup (a 4 × 4 grid) to measure two-dimensional sensory maps of between and within-digit (D2-D4) space using high spatial-resolution (1.25 mm isotropic) imaging at 7 Tesla together with population receptive field (pRF) mapping in 10 participants. Using a 2D Gaussian pRF model, we capture maps of the coverage of digits D2-D5 across Brodmann areas and estimate pRF size and shape. In addit...
Source: Brain Topography - August 27, 2023 Category: Neuroscience Authors: Michael Asghar Rosa Sanchez-Panchuelo Denis Schluppeck Susan Francis Source Type: research
Second Order Blind Identification of Event Related Potentials Sources
In this study, we present a novel implementation of a method for decomposing multi-channel ERP into components, which is based on the modeling of second-order statistics of ERPs. We also report a new implementation of Bayesian Information Criteria (BIC), which is used to select the optimal number of hidden signals (components) in the original ERPs. We tested these methods using both synthetic datasets and real ERPs data arrays. Testing has shown that the ERP decomposition method can reconstruct the source signals from their mixture with acceptable accuracy even when these signals overlap significantly in time and the prese...
Source: Brain Topography - August 25, 2023 Category: Neuroscience Authors: Valery A Ponomarev Jury D Kropotov Source Type: research
Second Order Blind Identification of Event Related Potentials Sources
In this study, we present a novel implementation of a method for decomposing multi-channel ERP into components, which is based on the modeling of second-order statistics of ERPs. We also report a new implementation of Bayesian Information Criteria (BIC), which is used to select the optimal number of hidden signals (components) in the original ERPs. We tested these methods using both synthetic datasets and real ERPs data arrays. Testing has shown that the ERP decomposition method can reconstruct the source signals from their mixture with acceptable accuracy even when these signals overlap significantly in time and the prese...
Source: Brain Topography - August 25, 2023 Category: Neuroscience Authors: Valery A Ponomarev Jury D Kropotov Source Type: research
The Relationship Between Cortical Morphological and Functional Topological Properties and Clinical Manifestations in Patients with Posttraumatic Diffuse Axonal Injury: An Individual Brain Network Study
Brain Topogr. 2023 Aug 24. doi: 10.1007/s10548-023-00964-x. Online ahead of print.ABSTRACTTo evaluate the altered network topological properties and their clinical relevance in patients with posttraumatic diffuse axonal injury (DAI). Forty-seven participants were recruited in this study, underwent 3D T1-weighted and resting-state functional MRI, and had single-subject morphological brain networks (MBNs) constructed by Kullback-Leibler divergence and functional brain networks (FBNs) constructed by Pearson correlation measurement interregional similarity. The global and regional properties were analyzed and compared using gr...
Source: Brain Topography - August 24, 2023 Category: Neuroscience Authors: Fuqing Zhou Lin Wu Long Qian Hongmei Kuang Jie Zhan Jian Li Gerald L Cheung Aimin Ding Honghan Gong Source Type: research
