View PDF - MRC Brain Network Dynamics Unit
... Marsden et al. 2001; Williams et al. 2002). The recording sites available in the human are necessarily limited to therapeutic targets, such as the STN, and recordings can be performed only in patients with abnormal movement control. The overall objective of the current work was to investigate functi ...
... Marsden et al. 2001; Williams et al. 2002). The recording sites available in the human are necessarily limited to therapeutic targets, such as the STN, and recordings can be performed only in patients with abnormal movement control. The overall objective of the current work was to investigate functi ...
Disentanglement of local field potential sources by independent
... mainly raised by the extracellular spatiotemporal summation of synaptic currents and recorded from the scalp by volume conduction. The mixing of electrical sources from different spatial origin is a major handicap for the study of brain signals at this level. So far the separation of the electrical ...
... mainly raised by the extracellular spatiotemporal summation of synaptic currents and recorded from the scalp by volume conduction. The mixing of electrical sources from different spatial origin is a major handicap for the study of brain signals at this level. So far the separation of the electrical ...
Measuring Cortical Thickness - McConnell Brain Imaging Centre
... this approach finds the shortest line from the cortical surface to the grey and white matter boundary - though the direction which that line could take may be constrained. The use of this straight-line method was initially implemented in the study of post-mortem specimen, where the investigator woul ...
... this approach finds the shortest line from the cortical surface to the grey and white matter boundary - though the direction which that line could take may be constrained. The use of this straight-line method was initially implemented in the study of post-mortem specimen, where the investigator woul ...
Epileptiform Activity Can Be Initiated in Various Neocortical Layers
... can be initiated in various neocortical layers: an optical imaging study. J. Neurophysiol. 82: 1965–1973, 1999. The initiation site for triggering epileptiform activity was investigated via optical imaging using voltage-sensitive dyes in the neocortical slice perfused with artificial cerebral spinal ...
... can be initiated in various neocortical layers: an optical imaging study. J. Neurophysiol. 82: 1965–1973, 1999. The initiation site for triggering epileptiform activity was investigated via optical imaging using voltage-sensitive dyes in the neocortical slice perfused with artificial cerebral spinal ...
The effect of selective attention on auditory frequency
... noise depends largely on the differences in neural level representations of the auditory inputs. The auditory cortex (AC) is tonotopically organized, which means that the frequency information is mapped to the cortical topography. Thus, similar frequencies are processed in close vicinity at AC. The ...
... noise depends largely on the differences in neural level representations of the auditory inputs. The auditory cortex (AC) is tonotopically organized, which means that the frequency information is mapped to the cortical topography. Thus, similar frequencies are processed in close vicinity at AC. The ...
Effect of transcutaneous acupoint electrical stimulation on propofol
... Background: Transcutaneous acupoint electrical stimulation (TAES) as a needleless acupuncture has the same effect like traditional manual acupuncture. The combination of TAES and anesthesia has been proved valid in enhancing the anesthetic effects but its mechanisms are still not clear. Methods: In ...
... Background: Transcutaneous acupoint electrical stimulation (TAES) as a needleless acupuncture has the same effect like traditional manual acupuncture. The combination of TAES and anesthesia has been proved valid in enhancing the anesthetic effects but its mechanisms are still not clear. Methods: In ...
Effects of uniform extracellular DC electric fields on excitability in rat
... C The Physiological Society 2004 ...
... C The Physiological Society 2004 ...
Deshpande_Gopikrishna_200708_phd
... indicated are A: Lateral pre-frontal cortex (LPFC), B: Inferior parietal cortex (IPC), C: Medial pre-frontal cortex (MPFC), D: Dorsal anterior cingulate cortex (dACC) and E: Posterior cingulate cortex (PCC) extending rostrally into precuneus. The slices containing the components of the default mode ...
... indicated are A: Lateral pre-frontal cortex (LPFC), B: Inferior parietal cortex (IPC), C: Medial pre-frontal cortex (MPFC), D: Dorsal anterior cingulate cortex (dACC) and E: Posterior cingulate cortex (PCC) extending rostrally into precuneus. The slices containing the components of the default mode ...
Column-Based Model of Electric Field Excitation of Cerebral Cortex
... injection, tailored to obtain satisfactory coincidence detection rates. A 40-sec scan was triggered as the tracer bolus entered the brain; TMS, sham TMS, or hand movement accompanied this scan segment. A 50-sec scan immediately followed the 40-sec scan, during which TMS, sham TMS or hand movement we ...
... injection, tailored to obtain satisfactory coincidence detection rates. A 40-sec scan was triggered as the tracer bolus entered the brain; TMS, sham TMS, or hand movement accompanied this scan segment. A 50-sec scan immediately followed the 40-sec scan, during which TMS, sham TMS or hand movement we ...
pdf
... attributable to maladaptive plasticity due to damage to auditory system. Changes have been observed in auditory structures such as the inferior colliculus, the thalamus and the auditory cortex as well as in non-auditory brain areas. However, the observed changes show great variability, hence lacking ...
... attributable to maladaptive plasticity due to damage to auditory system. Changes have been observed in auditory structures such as the inferior colliculus, the thalamus and the auditory cortex as well as in non-auditory brain areas. However, the observed changes show great variability, hence lacking ...
Comparing the Functional Representations of Central and Border
... poststimulus onset was divided by 500 msec of prestimulus IS activity occurring immediately before stimulus onset. After the ratio values were processed with a Gaussian filter (half-width of 5), the areal extent of the f unctional representation was quantified by thresholding at three levels above p ...
... poststimulus onset was divided by 500 msec of prestimulus IS activity occurring immediately before stimulus onset. After the ratio values were processed with a Gaussian filter (half-width of 5), the areal extent of the f unctional representation was quantified by thresholding at three levels above p ...
annual report of the erwin l. hahn institute for magnetic resonance
... ameliorate the effects of inhomogeneities of both the static and radiofrequency magnetic fields. For example, we have looked at optimising the signal combinations from phased array coils, based on the SNR of GABA. This technique made it possible to increase the sensitivity for deeper voxels, like th ...
... ameliorate the effects of inhomogeneities of both the static and radiofrequency magnetic fields. For example, we have looked at optimising the signal combinations from phased array coils, based on the SNR of GABA. This technique made it possible to increase the sensitivity for deeper voxels, like th ...
Spontaneous activity in developing sensory circuits
... activity during early developmental time periods equivalent to the fetal stage in humans. This review examines the evidence that this activity is not equivalent to resting-state modulations in adults, either in terms of generative mechanisms or function. This is important because understanding the d ...
... activity during early developmental time periods equivalent to the fetal stage in humans. This review examines the evidence that this activity is not equivalent to resting-state modulations in adults, either in terms of generative mechanisms or function. This is important because understanding the d ...
Response Suppression in V1 Agrees with Psychophysics of
... Subjects viewed the stimuli while time series of MRI volumes were acquired (every 1.5 sec) using a T2 *-sensitive, spiral-trajectory, gradientecho pulse sequence (Glover and Lai, 1998; Glover, 1999): echo time (TE), 30 msec; repetition time (TR), 750 msec (two interleaves); flip angle, 55°; field of ...
... Subjects viewed the stimuli while time series of MRI volumes were acquired (every 1.5 sec) using a T2 *-sensitive, spiral-trajectory, gradientecho pulse sequence (Glover and Lai, 1998; Glover, 1999): echo time (TE), 30 msec; repetition time (TR), 750 msec (two interleaves); flip angle, 55°; field of ...
Kimchi terkel seeing and not seeing current opinion in neuro 2002
... 10–30 cm (T Kimchi, M Reshef, J Terkel, unpublished data). Such a mechanism of orientation could explain the mole rat’s ability to maintain its tunnel at constant depth (10–20 cm deep) parallel to the surface [4] as well as to determine the size, matter and relative location of an obstacle it must d ...
... 10–30 cm (T Kimchi, M Reshef, J Terkel, unpublished data). Such a mechanism of orientation could explain the mole rat’s ability to maintain its tunnel at constant depth (10–20 cm deep) parallel to the surface [4] as well as to determine the size, matter and relative location of an obstacle it must d ...
Optogenetic drive of neocortical pyramidal neurons generates fMRI
... dcLFP provides a better measure of currents induced by optical drive, although it is noted that these steady state changes should typically be present in other types of stimulation (e.g., sensory drive). 2.3. Fidelity of local field potential measurements LFP measured from the laminar electrodes dem ...
... dcLFP provides a better measure of currents induced by optical drive, although it is noted that these steady state changes should typically be present in other types of stimulation (e.g., sensory drive). 2.3. Fidelity of local field potential measurements LFP measured from the laminar electrodes dem ...
Somatosensory cortex functional connectivity
... responses to vibrotactile stimulation in ASD would achieve this goal. In healthy individuals, vibrotactile stimulations on the fingertips dramatically increase the behaviourally measured temporal separation threshold needed for distinguishing between two consecutive tactile pulses, but no such effect ...
... responses to vibrotactile stimulation in ASD would achieve this goal. In healthy individuals, vibrotactile stimulations on the fingertips dramatically increase the behaviourally measured temporal separation threshold needed for distinguishing between two consecutive tactile pulses, but no such effect ...
The Effect of Movement Rate and Complexity on
... extremities, as compared with the upper extremities, then brain activation would not be modulated with movement rate and complexity. To our knowledge this is the first report describing task-related changes in brain activation, as measured by fMRI, during continuous, rhythmic, reciprocal, multijoint ...
... extremities, as compared with the upper extremities, then brain activation would not be modulated with movement rate and complexity. To our knowledge this is the first report describing task-related changes in brain activation, as measured by fMRI, during continuous, rhythmic, reciprocal, multijoint ...
The Neuroscientist
... Figure 1. Online analysis of single-subject fMRI data. Orthographic 3D view of statistical maps (left) and blood-oxygen level–dependent (BOLD) time course (right, white line) in two selected regions of interest corresponding to the red and green box, respectively (TurboBrainVoyager, Brain Innovation ...
... Figure 1. Online analysis of single-subject fMRI data. Orthographic 3D view of statistical maps (left) and blood-oxygen level–dependent (BOLD) time course (right, white line) in two selected regions of interest corresponding to the red and green box, respectively (TurboBrainVoyager, Brain Innovation ...
Functional Organization of Ferret Auditory Cortex
... Spike sorting was performed offline. Only signals with an amplitude three times that of the noise were recorded by the data acquisition software as ‘spikes’. Units were isolated from the digitized signal by manually clustering data according to spike features, such as amplitude, width and area. We al ...
... Spike sorting was performed offline. Only signals with an amplitude three times that of the noise were recorded by the data acquisition software as ‘spikes’. Units were isolated from the digitized signal by manually clustering data according to spike features, such as amplitude, width and area. We al ...
Methods - Laboratory for Advanced Brain Signal Processing
... classification results, discriminant analysis was applied in combination with jack-knifing, a procedure which typically produces lower discrimination rate than, e.g., crossvalidation based on using part of a sample for learning and other part for classification, but is statistically more correct and ...
... classification results, discriminant analysis was applied in combination with jack-knifing, a procedure which typically produces lower discrimination rate than, e.g., crossvalidation based on using part of a sample for learning and other part for classification, but is statistically more correct and ...
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... functional magnetic resonance imaging (fMRI). 䡲 CASE DESCRIPTION: Transcranial magnetic stimulation (TMS) is a noninvasive technique capable of modulating the ongoing activity of the human brain. When linked with a neuronavigation system, fMRI-guided frontal cortex TMS can be performed in a placebo- ...
... functional magnetic resonance imaging (fMRI). 䡲 CASE DESCRIPTION: Transcranial magnetic stimulation (TMS) is a noninvasive technique capable of modulating the ongoing activity of the human brain. When linked with a neuronavigation system, fMRI-guided frontal cortex TMS can be performed in a placebo- ...
Transcranial Magnetic Stimulation: A Neuroscientific Probe of
... ior relationships. The temporal resolution is excellent because each pulse is less than 1 msec, but its action can be substantially extended past the 1-msec timeframe (20). The spatial resolution is moderate, estimated to affect approximately 5 mm3 of brain cortex. However, because of the transsynap ...
... ior relationships. The temporal resolution is excellent because each pulse is less than 1 msec, but its action can be substantially extended past the 1-msec timeframe (20). The spatial resolution is moderate, estimated to affect approximately 5 mm3 of brain cortex. However, because of the transsynap ...
Chaos in the Brain. - Brain Dynamics Laboratory
... Nonlinear dynamics and Chaos Systems behaving in this manner are now called “chaotic.” They are essentially nonlinear, indicating that initial errors in measurements do not remain constant, rather they grow and decay nonlinearly (usually exponentially) with time. Since prediction becomes impossible ...
... Nonlinear dynamics and Chaos Systems behaving in this manner are now called “chaotic.” They are essentially nonlinear, indicating that initial errors in measurements do not remain constant, rather they grow and decay nonlinearly (usually exponentially) with time. Since prediction becomes impossible ...
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