Mapping EEG-potentials on the surface of the brain: A strategy for uncovering cortical sources

Junghöfer, Markus; Elbert, Thomas; Leiderer, Paul; Berg, Patrick; Rockstroh, Brigitte

doi:10.1007/bf01190389

Cited by 114 publications

(90 citation statements)

References 14 publications

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“…First, the use of an average reference may give a different PCA outcome as compared to linked ear-lobe references. This is due to the fact that earlobe references apply differential weighting to the sensors, increasing the potential at central and midline sites and eventually neglecting activity at sites near the mastoids (Dien et al, 1997;Junghö fer et al, 1997). Since the P2 has been reported to have maximum amplitude at central midline sites, this could contribute to an overestimation of its size.…”

Section: Principal Component Analysis Of the Mnementioning

confidence: 89%

High resolution EEG indicators of pain responses in relation to hypnotic susceptibility and suggestion

Ray

Keil

Mikuteit

et al. 2002

Biological Psychology

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In this report we use a dense array (129 electrodes) EEG procedure to examine the effects of hypnotic susceptibility and hypnotic suggestions on electrocortical and self-report measures of painful stimuli. Self-report and event-related potential measures of six high and six low hypnotic susceptible individuals in response to pain were examined during an initial baseline condition and following a standard hypnotic induction under suggestions to either increase (hyperalgesia) or decrease (hypoalgesia) the painful stimulation. Our results show that high and low hypnotically susceptible individuals: (1) show few self-report or psychophysiological differences in response to baseline pain stimuli; (2) report differential pain experiences depending on hypnotic suggestions and (3) display differential psychophysiological indicators following an hypnotic induction with a suggestion of hypoalgesia. Overall, the findings suggest that hypnotic suggestions with high susceptible individuals modulate the later components of the evoked potential in a global manner and point up the importance of using both high and low hypnotically susceptible individuals preceding and following an hypnotic induction.

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Section: Principal Component Analysis Of the Mnementioning

confidence: 89%

High resolution EEG indicators of pain responses in relation to hypnotic susceptibility and suggestion

Ray

Keil

Mikuteit

et al. 2002

Biological Psychology

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“…With respect to the spatial arrangement of the approximated sensors, it was ensured that the rejected sensors were not located within one region of the scalp, because that would make interpolation for this area invalid. Spherical spline interpolation was used throughout, both for approximation of sensors and for illustration of voltage maps (Junghöfer, Elbert, Leiderer, Berg, & Rockstroh, 1997).…”

Section: Methodsmentioning

confidence: 99%

Cross-modal attention capture by affective stimuli: Evidence from event-related potentials

Keil

Bradley

Junghöfer

et al. 2007

Cognitive, Affective, & Behavioral Neuroscience

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The P3 component of the event-related potential (ERP) to an acoustic startle probe is modulated during picture viewing, with reduced P3 amplitude when participants view either pleasant or unpleasant, as opposed to neutral, pictures. We have interpreted this as reflecting capture of attentional resources by affective pictures, with fewer resources available for processing the secondary startle probe. In the present study, we tested this resource allocation hypothesis by presenting either pictures or sounds as foreground stimuli, with the prediction that P3 amplitude in response to secondary startle probes would be reduced for affectively engaging foregrounds regardless of modality. Using dense-array electroencephalography and a source estimation procedure, we observed that P3 amplitude was indeed smaller when startle probes were presented during emotional, as opposed to neutral, stimuli for both sound and picture foregrounds. Source modeling indicated a common frontocentral maximum of P3 modulation by affect. The data support the notion that emotionally arousing stimuli transmodally attract resources, leading to optimized processing of the affective stimuli at the cost of the processing of concurrent stimuli.

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“…It may have been more advisable to transform the EEG data to reference-free data by using Laplacian operator methods (e.g., Hjorth 1975;Perrin et al 1989) or the use of an average reference (Lehmann and Michel, 1989). These transformations were not completed in the present study because of the misleading results from a small number of recording channels (Babiloni et al 1995(Babiloni et al , 1996Dien 1998;Junghö fer et al 1997;Yao et al 2005). The reader is reminded that the choice of the reference electrode(s) and the adoption of a particular montage emphasize different properties of the EEG signals (Knyazeva et al 1999;Pfurtscheller and Lopes da Silva 1988).…”

Section: Limitations Of the Studymentioning

confidence: 99%

Cortical Activity Prior to, and During, Observation and Execution of Sequential Finger Movements

Calmels

Holmes

Jarry³

et al. 2006

Brain Topogr

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Summary: The aim of this study was to provide further evidence for the existence of a mirror neuron system in humans using electroencephalography during the observation and execution of non-object-related movements. Event-related desynchronization and synchronization (ERD/ERS) were used to characterize brain activity prior to, and during, observation and execution of a finger movement in four frequency bands (7-10 Hz, 10-13 Hz, 13-20 Hz, and 20-30 Hz). Electroencephalograms (EEGs) were recorded from 19 electrode sites in eight participants. In all the frequency bands and electrode sites, results revealed that there was no significant differences in EEG cortical activity between the observation condition and the execution conditions. Comparison of the two stages of the movement (i.e., pre-movement and movement) in the observation and execution conditions showed, in most cases, that pre-movement ERD values were less than movement ERD values. Whilst there was not an identical match of EEG cortical indices, this study provides further support for the existence of a mirror neuron system in humans. The incomplete congruence may be explained by the different behaviors, the nature of the task and factors in the observed action coded by the mirror system.

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Mapping EEG-potentials on the surface of the brain: A strategy for uncovering cortical sources

Cited by 114 publications

References 14 publications

High resolution EEG indicators of pain responses in relation to hypnotic susceptibility and suggestion

High resolution EEG indicators of pain responses in relation to hypnotic susceptibility and suggestion

Cross-modal attention capture by affective stimuli: Evidence from event-related potentials

Cortical Activity Prior to, and During, Observation and Execution of Sequential Finger Movements

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