Classification of Electroencephalograph Data: A Hubness
... A common feature of the aforementioned diagnostic problems and EEG-based tools (such as EEG-controlled web browsers or spelling tools) is that they involve recognition tasks related to EEG signals. As EEG signals can be considered as multivariate time-series, these recognition tasks can be formulate ...
... A common feature of the aforementioned diagnostic problems and EEG-based tools (such as EEG-controlled web browsers or spelling tools) is that they involve recognition tasks related to EEG signals. As EEG signals can be considered as multivariate time-series, these recognition tasks can be formulate ...
- Wiley Online Library
... required before any functional information can be obtained. As a result, important patient management decisions must be made without complete knowledge of the anatomic relationship between the lesion borders and functionally eloquent cortex. In contrast, functional magnetic resonance imaging (fMRI) ...
... required before any functional information can be obtained. As a result, important patient management decisions must be made without complete knowledge of the anatomic relationship between the lesion borders and functionally eloquent cortex. In contrast, functional magnetic resonance imaging (fMRI) ...
Chapter 17 Intrinsic Optical Signal Imaging of Normal and Abnormal
... disadvantage of these techniques is in sampling because information is recorded from only a small region of adjacent space. Extraoperatively, several perfusion-based imaging modalities exist to measure physiology, such as positron emission tomography (PET), functional MRI (fMRI), single-photon emiss ...
... disadvantage of these techniques is in sampling because information is recorded from only a small region of adjacent space. Extraoperatively, several perfusion-based imaging modalities exist to measure physiology, such as positron emission tomography (PET), functional MRI (fMRI), single-photon emiss ...
Neurophysiological investigation of the basis of the fMRI signal
... exact relationship between the measured fMRI signal and the underlying neural activity is unclear. Here we present simultaneous intracortical recordings of neural signals and fMRI responses. We compared local ®eld potentials (LFPs), single- and multi-unit spiking activity with highly spatio-temporal ...
... exact relationship between the measured fMRI signal and the underlying neural activity is unclear. Here we present simultaneous intracortical recordings of neural signals and fMRI responses. We compared local ®eld potentials (LFPs), single- and multi-unit spiking activity with highly spatio-temporal ...
brain –computer interface - Nexus Academic Publishers
... The brain is incredibly complex. To say that all thoughts or actions are the result of simple electric signals in the brain is a gross understatement. There are about 100 billion neurons in a human brain. Each neuron is constantly sending and receiving signals through a complex web of connections. T ...
... The brain is incredibly complex. To say that all thoughts or actions are the result of simple electric signals in the brain is a gross understatement. There are about 100 billion neurons in a human brain. Each neuron is constantly sending and receiving signals through a complex web of connections. T ...
Towards the utilization of EEG as a brain imaging tool
... (Luck, 2005), the increasingly common use of high-density EEG systems with more than 100 electrodes (Tucker, 1993) both in experimental and clinical settings leads to an increasing request for such spatial analysis methods for the EEG as well (Fig. 1). There are several reasons for basing analyses o ...
... (Luck, 2005), the increasingly common use of high-density EEG systems with more than 100 electrodes (Tucker, 1993) both in experimental and clinical settings leads to an increasing request for such spatial analysis methods for the EEG as well (Fig. 1). There are several reasons for basing analyses o ...
Basic Physics of SWI and Relaxation
... QSM includes two techniques to solve the each ill-posed problem: background field removal (BFR) and field-to-susceptibility inversion (FSI). BFR is to remove susceptibility effect from material in the background and inhomogeneity due to the MRI system. There have been presented several techniques us ...
... QSM includes two techniques to solve the each ill-posed problem: background field removal (BFR) and field-to-susceptibility inversion (FSI). BFR is to remove susceptibility effect from material in the background and inhomogeneity due to the MRI system. There have been presented several techniques us ...
Structural divisions and functional fields in the human cerebral cortex 1
... This paper presents some ideas on how the cerebral cortex of man could be parcelled based on structural and functional criteria. Any parcellation is based on an assumption of what is a cortical area. Since cortical areas are thought to reflect the principle of organization of the cerebral cortex, th ...
... This paper presents some ideas on how the cerebral cortex of man could be parcelled based on structural and functional criteria. Any parcellation is based on an assumption of what is a cortical area. Since cortical areas are thought to reflect the principle of organization of the cerebral cortex, th ...
Short Communication - NYU Psychology
... which has been shown to engender processing costs in self-paced reading (e.g., McElree, Traxler, Pickering, Seely, & Jackendoff, 2001), eye-tracking (e.g., Traxler, McElree, Williams, & Pickering (2005), and speed–accuracy tradeoff measures (McElree, Pylkkänen, Pickering, & Traxler, 2006). Important ...
... which has been shown to engender processing costs in self-paced reading (e.g., McElree, Traxler, Pickering, Seely, & Jackendoff, 2001), eye-tracking (e.g., Traxler, McElree, Williams, & Pickering (2005), and speed–accuracy tradeoff measures (McElree, Pylkkänen, Pickering, & Traxler, 2006). Important ...
ICDVRAT2006_S09_N01_Miranda
... The EEG is measured as the voltage difference between two or more electrodes on the surface of the scalp one of which is taken as a reference. The EEG expresses the overall activity of millions of neurons in the brain in terms of charge movement, but the electrodes can detect this only in the most s ...
... The EEG is measured as the voltage difference between two or more electrodes on the surface of the scalp one of which is taken as a reference. The EEG expresses the overall activity of millions of neurons in the brain in terms of charge movement, but the electrodes can detect this only in the most s ...
Transcranial Magnetic Stimulation: Safety Considerations
... neuropsychological consequences of TMS in neurologically normal subjects. Several studies in which a number of cognitive tasks were administered before and after TMS (Pascual-Leone et al, 1993; Wasserman et al, 1996c) have been reported. In these studies there were no adverse effects of TMS; in fact ...
... neuropsychological consequences of TMS in neurologically normal subjects. Several studies in which a number of cognitive tasks were administered before and after TMS (Pascual-Leone et al, 1993; Wasserman et al, 1996c) have been reported. In these studies there were no adverse effects of TMS; in fact ...
Investigating neural correlates of conscious perception by frequency
... 8.33 Hz (f2), the flicker frequency of s2. The peak is confined to 1 frequency bin (0.0032 Hz). The SNR, defined as the ratio of the power at the peak and the average power in a 0.06 Hz band (40 bins) surrounding it, is 25.0 (7.41 Hz, anterior channel), 29.7 (8.33 Hz, anterior channel), 39.2 (7.41 H ...
... 8.33 Hz (f2), the flicker frequency of s2. The peak is confined to 1 frequency bin (0.0032 Hz). The SNR, defined as the ratio of the power at the peak and the average power in a 0.06 Hz band (40 bins) surrounding it, is 25.0 (7.41 Hz, anterior channel), 29.7 (8.33 Hz, anterior channel), 39.2 (7.41 H ...
Is neuroimaging measuring information in the brain? | SpringerLink
... What does it mean to measure information in the brain? When we record neural activity after the presentation of a stimulus, can we call that activity the neural representation of that stimulus? What technique provides the best measure of information? Are single-cell recordings a more direct measure ...
... What does it mean to measure information in the brain? When we record neural activity after the presentation of a stimulus, can we call that activity the neural representation of that stimulus? What technique provides the best measure of information? Are single-cell recordings a more direct measure ...
Towards Detection of Brain Tumor in Electroencephalogram
... including a simple dot product of signal vectors, polynomial versions of the dot product, and a radial basis function. The radial basis function SVM appears to provide superior performance in classifying functional classes of EEG signal when compared to the other SVM similarity metrics. EEG records ...
... including a simple dot product of signal vectors, polynomial versions of the dot product, and a radial basis function. The radial basis function SVM appears to provide superior performance in classifying functional classes of EEG signal when compared to the other SVM similarity metrics. EEG records ...
MRM spectrscopy
... ents act to alter the magnetic field along the direction they are applied. A gradient along the z axis causes the field to vary along that axis. Application of a narrow radio frequency pulse at 64 MHz in the presence of this strong gradient excites only those protons in a very narrow slice, which sa ...
... ents act to alter the magnetic field along the direction they are applied. A gradient along the z axis causes the field to vary along that axis. Application of a narrow radio frequency pulse at 64 MHz in the presence of this strong gradient excites only those protons in a very narrow slice, which sa ...
Layer IV of the primary somatosensory cortex has the highest
... there were significant differences in layers and treatment conditions (F(4, 39) = 49.61, P b 0.001 and F(2, 39) = 5.01, P b 0.05, respectively, Table 4). Post hoc tests showed that there were significant differences in treatment conditions within layer IV (control vs. lidocaine treatment, P = 0.017 ...
... there were significant differences in layers and treatment conditions (F(4, 39) = 49.61, P b 0.001 and F(2, 39) = 5.01, P b 0.05, respectively, Table 4). Post hoc tests showed that there were significant differences in treatment conditions within layer IV (control vs. lidocaine treatment, P = 0.017 ...
(fMRI) in Brain Tumour Patients
... The choice of active and baseline conditions is driven by the brain function of interest. Typical tasks to induce motor activation are finger tapping (Figure 1), wrist flexion, foot tapping, and lip pouting, for somatotopic mapping along the motor cortex. Commonly used tasks to activate the language ...
... The choice of active and baseline conditions is driven by the brain function of interest. Typical tasks to induce motor activation are finger tapping (Figure 1), wrist flexion, foot tapping, and lip pouting, for somatotopic mapping along the motor cortex. Commonly used tasks to activate the language ...
Patient Machine Interface for the Control of Mechanical Ventilation
... (2) Flow trigger. The ventilator is activated when the flow, induced by the patient effort, surpass a cutoff value (sensitivity). Though considered more sensitive than (1), it might fail to avoid or eliminate patient-ventilator asynchrony [19]. (3) Electrical activity (electromyogram) of the diaphra ...
... (2) Flow trigger. The ventilator is activated when the flow, induced by the patient effort, surpass a cutoff value (sensitivity). Though considered more sensitive than (1), it might fail to avoid or eliminate patient-ventilator asynchrony [19]. (3) Electrical activity (electromyogram) of the diaphra ...
Repetition and the brain: neural models of stimulus
... for two main reasons. First, repetition effects have proved useful for inferring the nature of representations across different stages of a processing stream. This approach has been used behaviorally (e.g. using visual aftereffects to infer the nature of orientation tuning [21] or face representatio ...
... for two main reasons. First, repetition effects have proved useful for inferring the nature of representations across different stages of a processing stream. This approach has been used behaviorally (e.g. using visual aftereffects to infer the nature of orientation tuning [21] or face representatio ...
Repetition and the brain: neural models of stimulus
... for two main reasons. First, repetition effects have proved useful for inferring the nature of representations across different stages of a processing stream. This approach has been used behaviorally (e.g. using visual aftereffects to infer the nature of orientation tuning [21] or face representatio ...
... for two main reasons. First, repetition effects have proved useful for inferring the nature of representations across different stages of a processing stream. This approach has been used behaviorally (e.g. using visual aftereffects to infer the nature of orientation tuning [21] or face representatio ...
Computational modeling of responses in human visual
... stimulus-driven responses. Visual cortex was localized rather early, though not without some serious disputes (1-3). The biologists were joined in the late 19th and early 20th centuries by neurologists and ophthalmologists (4-7). The clinicians treated soldiers who had occipital head wounds that cau ...
... stimulus-driven responses. Visual cortex was localized rather early, though not without some serious disputes (1-3). The biologists were joined in the late 19th and early 20th centuries by neurologists and ophthalmologists (4-7). The clinicians treated soldiers who had occipital head wounds that cau ...
Lab 6
... Neurons in the brain can impact all aspects of human life including completing motor activities, performing mental thought, memories, and dreaming. The electroencephalogram (EEG) is a recording from the surface of the scalp generated by many biopotentials in the cerebrum of the brain. More specifica ...
... Neurons in the brain can impact all aspects of human life including completing motor activities, performing mental thought, memories, and dreaming. The electroencephalogram (EEG) is a recording from the surface of the scalp generated by many biopotentials in the cerebrum of the brain. More specifica ...
Here - Statistical Analysis of Neuronal Data
... bias traditional measures using large batteries of simulated data. Traditional methods are biased by a number of features, including firing rate and dwell time in a cell s receptive field. To combat this, we have used a maximum likelihood estimation approach as a less biased and more sensitive way t ...
... bias traditional measures using large batteries of simulated data. Traditional methods are biased by a number of features, including firing rate and dwell time in a cell s receptive field. To combat this, we have used a maximum likelihood estimation approach as a less biased and more sensitive way t ...
Regulation of rCBF by Diffusible Signals: An Analysis of Constraints
... activity-dependent hemodynamic response places a the dynamics of concentration changes; the microveslower limit on the apparent rates of diffusion and sels themselves were not explicitly modeled. elimination. Using simulations of microdiffusion we Because of the complicated spatiotemporal changes ex ...
... activity-dependent hemodynamic response places a the dynamics of concentration changes; the microveslower limit on the apparent rates of diffusion and sels themselves were not explicitly modeled. elimination. Using simulations of microdiffusion we Because of the complicated spatiotemporal changes ex ...
Magnetoencephalography
Magnetoencephalography (MEG) is a functional neuroimaging technique for mapping brain activity by recording magnetic fields produced by electrical currents occurring naturally in the brain, using very sensitive magnetometers. Arrays of SQUIDs (superconducting quantum interference devices) are currently the most common magnetometer, while the SERF (spin exchange relaxation-free) magnetometer is being investigated for future machines. Applications of MEG include basic research into perceptual and cognitive brain processes, localizing regions affected by pathology before surgical removal, determining the function of various parts of the brain, and neurofeedback. This can be applied in a clinical setting to find locations of abnormalities as well as in an experimental setting to simply measure brain activity