en
0.25
0.5
0.75
1.25
1.5
1.75
2
Recording Spikes ... Noninvasively?
Published on Dec 03, 20122671 Views
The detectability of spikes defines a striking contrast between invasive (microscopic) and noninvasive (macroscopic) neurophysiological measurements. While noninvasive records are dominated by summed
Related categories
Chapter list
Recording spikes ... noninvasively?00:00
Berger's bands – and beyond03:55
Standard-MEG/EEG: Σ (EPSP + IPSP)05:53
Neurophysics of hf-EEG (… and MEG)07:44
Ion currents and membrane potential09:06
Closing the current loop11:56
Equivalent Current Dipole (ECD)14:39
Synaptic events: EPSP and IPSP18:12
Far fields: tangential cortical dipoles - 121:36
Far fields: tangential cortical dipoles - 221:56
Far fields: radial cortical dipoles25:12
Propagating action potential26:06
Infinite vs. finite volume conductor28:47
Action potential: quadrupole30:07
Homogenous volume conductor32:18
Conductivity Change: Ohm's Law33:19
Conductivity Change: Polarity Switch37:32
Geometry of volume conductor38:01
Localisation of reference electrode39:28
Changing direction of propagation40:04
Subcortical far field 'generators'43:33
Somatosensory evoked potential in man: far field potentials46:01
Early EEG studies (1976-1988)46:57
MEG: Cortical burst generator - 149:05
MEG: Cortical burst generator - 250:51
Co-localisation of N20m and 600 Hz burst - 152:27
Co-localisation of N20m and 600 Hz burst - 254:29
Somatotopy56:02
Burst components: stimulation rate57:22
Burst components: simultanous MEG + EEG01:01:06
Thalamic SEP: Deep Brain Stimulation (DBS)01:03:32
Physiology in LGN: Intensity01:04:55
Early median nerve somatosensory evoked responses01:07:20
EEG source analysis01:07:51
Early burst survives cortical glutamate antagonisation01:09:15
Epidural SEP from monkey S-101:11:28
Physiology in monkey S-1: burst neurons - 101:12:42
Physiology in monkey S-1: burst neurons - 201:13:26
Physiology in monkey S-1: burst neurons - 301:15:05
Physiology in monkey S-1: burst neurons - 401:17:29
Physiology in monkey S-1: burst neurons - 501:18:52
Single-cell spike burst patterns: 111 vs 11001:19:41
Physiology in cat V-1: burst neurons01:22:31
SEP bursts can be recovered during fMRI (n=49)01:23:44
BOLD covariation with SEP components01:25:05
Berger's bands – and far beyond01:26:59
MEG noise analysis: amplitude spectra01:27:42
Thermal Johnson–Nyquist noise (electrode-skin impedance)01:29:03
Impedances – checking the limits01:31:37
White noise level of EEG spectra01:32:45
Averaged SEP: Stockwell transform (time-freq.)01:34:07
Yesterday’s noise may be tomorrow’s signal01:35:00
Thanks01:36:05