Limits...
Multiple linear regression to estimate time-frequency electrophysiological responses in single trials.

Hu L, Zhang ZG, Mouraux A, Iannetti GD - Neuroimage (2015)

Bottom Line: Transient sensory, motor or cognitive event elicit not only phase-locked event-related potentials (ERPs) in the ongoing electroencephalogram (EEG), but also induce non-phase-locked modulations of ongoing EEG oscillations.ERD and ERS reflect changes in the parameters that control oscillations in neuronal networks and, depending on the frequency at which they occur, represent neuronal mechanisms involved in cortical activation, inhibition and binding.This permits within-subject statistical comparisons, correlation with pre-stimulus features, and integration of simultaneously-recorded EEG and fMRI.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Cognition and Personality (Ministry of Education) and Faculty of Psychology, Southwest University, Chongqing, China; Department of Neuroscience, Physiology and Pharmacology, University College London, UK. Electronic address: huli@swu.edu.cn.

No MeSH data available.


Related in: MedlinePlus

Time-frequency distributions of ERP/ERD/ERS and their scalp topographies.Group-level TFDs and scalp topographies of ERP, ERD, and ERS responses elicited by laser stimulation of the right hand dorsum. The scalp topography of the ERP response is centrally distributed and maximal at the vertex, similarly to that of the N2–P2 complex in the time domain (top panel). The scalp topography of the ERD response has a maximum contralateral to the stimulated side (middle panel). The scalp topography of the ERS response is symmetrically distributed, with a maximum on the frontal electrodes (bottom panel). These different topographies suggest that the three TFD responses have different underlying neural sources.
© Copyright Policy - CC BY
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4401443&req=5

f0010: Time-frequency distributions of ERP/ERD/ERS and their scalp topographies.Group-level TFDs and scalp topographies of ERP, ERD, and ERS responses elicited by laser stimulation of the right hand dorsum. The scalp topography of the ERP response is centrally distributed and maximal at the vertex, similarly to that of the N2–P2 complex in the time domain (top panel). The scalp topography of the ERD response has a maximum contralateral to the stimulated side (middle panel). The scalp topography of the ERS response is symmetrically distributed, with a maximum on the frontal electrodes (bottom panel). These different topographies suggest that the three TFD responses have different underlying neural sources.

Mentions: The scalp topography of each thresholded TFD was computed by spline interpolation of the mean power of the 20% time-frequency points displaying the highest power increase (ERP and ERS) or decrease (ERD), across all channels (Fig. 2). This “top 20%” summary value reflects, in each subject/trial, the highest response magnitudes in the thresholded TFD for each TF-feature, and reduces the noise that would be presented by including in the mean all points of the spectrogram, some of which would display little or no response. This approach avoids only selecting outlier values, and it has been successfully applied in previous studies (Iannetti et al., 2008; Iannetti et al., 2005b; Mayhew et al., 2010; Mitsis et al., 2008; Mouraux and Iannetti, 2008).


Multiple linear regression to estimate time-frequency electrophysiological responses in single trials.

Hu L, Zhang ZG, Mouraux A, Iannetti GD - Neuroimage (2015)

Time-frequency distributions of ERP/ERD/ERS and their scalp topographies.Group-level TFDs and scalp topographies of ERP, ERD, and ERS responses elicited by laser stimulation of the right hand dorsum. The scalp topography of the ERP response is centrally distributed and maximal at the vertex, similarly to that of the N2–P2 complex in the time domain (top panel). The scalp topography of the ERD response has a maximum contralateral to the stimulated side (middle panel). The scalp topography of the ERS response is symmetrically distributed, with a maximum on the frontal electrodes (bottom panel). These different topographies suggest that the three TFD responses have different underlying neural sources.
© Copyright Policy - CC BY
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4401443&req=5

f0010: Time-frequency distributions of ERP/ERD/ERS and their scalp topographies.Group-level TFDs and scalp topographies of ERP, ERD, and ERS responses elicited by laser stimulation of the right hand dorsum. The scalp topography of the ERP response is centrally distributed and maximal at the vertex, similarly to that of the N2–P2 complex in the time domain (top panel). The scalp topography of the ERD response has a maximum contralateral to the stimulated side (middle panel). The scalp topography of the ERS response is symmetrically distributed, with a maximum on the frontal electrodes (bottom panel). These different topographies suggest that the three TFD responses have different underlying neural sources.
Mentions: The scalp topography of each thresholded TFD was computed by spline interpolation of the mean power of the 20% time-frequency points displaying the highest power increase (ERP and ERS) or decrease (ERD), across all channels (Fig. 2). This “top 20%” summary value reflects, in each subject/trial, the highest response magnitudes in the thresholded TFD for each TF-feature, and reduces the noise that would be presented by including in the mean all points of the spectrogram, some of which would display little or no response. This approach avoids only selecting outlier values, and it has been successfully applied in previous studies (Iannetti et al., 2008; Iannetti et al., 2005b; Mayhew et al., 2010; Mitsis et al., 2008; Mouraux and Iannetti, 2008).

Bottom Line: Transient sensory, motor or cognitive event elicit not only phase-locked event-related potentials (ERPs) in the ongoing electroencephalogram (EEG), but also induce non-phase-locked modulations of ongoing EEG oscillations.ERD and ERS reflect changes in the parameters that control oscillations in neuronal networks and, depending on the frequency at which they occur, represent neuronal mechanisms involved in cortical activation, inhibition and binding.This permits within-subject statistical comparisons, correlation with pre-stimulus features, and integration of simultaneously-recorded EEG and fMRI.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Cognition and Personality (Ministry of Education) and Faculty of Psychology, Southwest University, Chongqing, China; Department of Neuroscience, Physiology and Pharmacology, University College London, UK. Electronic address: huli@swu.edu.cn.

No MeSH data available.


Related in: MedlinePlus