Mapping somatosensory evoked potentials to finger stimulation at intervals of 450 to 4000 msec and the issue of habituation when assessing early cognitive components

Tomberg, Claude; Desmedt, Jean Edouard; Ozaki, Isamu; Nguyễn, Thị Hiền; Chalklin, Vincent

doi:10.1016/0168-5597(89)90002-6

Cited by 74 publications

(40 citation statements)

References 27 publications

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“…In addition to active factors already mentioned, N140 evoked by somatosensory stimulation also largely includes passive factors, such as orienting response or attention captured by a sudden sensory input, because they change dramatically with manipulation of the interstimulus interval or with repetition of a stimulus [49,58,77,78]. The modulation is more vulnerable for N140 and P300 than earlier responses [58,77]. Fig.…”

Section: Passive Attentionmentioning

confidence: 94%

“…In studies on evoked potentials, the vertex response N1 (-P2) in the auditory modality has been considered to have an intimate connection with orienting response, because it is dramatically reduced in amplitude with the repetition of a stimulus [73][74][75][76]. In addition to active factors already mentioned, N140 evoked by somatosensory stimulation also largely includes passive factors, such as orienting response or attention captured by a sudden sensory input, because they change dramatically with manipulation of the interstimulus interval or with repetition of a stimulus [49,58,77,78]. The modulation is more vulnerable for N140 and P300 than earlier responses [58,77].…”

Section: Passive Attentionmentioning

confidence: 99%

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High Temporal Resolution Neuroimaging of Attentional and Somatosensory-Motor Processing in the Human Brain

Kida¹,

Kakigi

2008

CMIR

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Recent advances in neuroimaging techniques have unveiled the functional localization and timing of neural activations associated with a variety of brain functions. This review focuses on the timing of neural activations related to attentional and sensory-motor functions in the somatosensory system as revealed by high-temporal resolution neuroimaging studies using magnetoencephalography (MEG) and electroencephalography (EEG).We will briefly review basic concepts of EEG and MEG, and then EEG and MEG studies of attention and somatosensorymotor interaction while referring to previous studies using other techniques. Findings from patients with movement disorders will be also summarized. An overview of these studies shows that EEG and MEG are helpful to reveal cortical dynamics of attentional and sensory-motor processing in the human brain and potentially a powerful tool to evaluate the pathophysiology of relevant disorders.

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Section: Passive Attentionmentioning

confidence: 94%

Section: Passive Attentionmentioning

confidence: 99%

High Temporal Resolution Neuroimaging of Attentional and Somatosensory-Motor Processing in the Human Brain

Kida¹,

Kakigi

2008

CMIR

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“…A shock was followed 1 s later by a flash, the flash was then followed 2 s later by a click, and then the click was followed 2 s later by the next electric shock, so that the ISI (inter-stimulus interval) for the stimuli of identical modality was always 5 s, and each 2 channels of SEP, VEP and AEP was recorded separately, in about 8 min 20 s (13). Longer ISI results in a reduced rate of habituation (23). The cross-modality depression of the amplitude of EP (15%) when stimuli of different modality are repeated alternatively is smaller than identical modality depression (28% on average) when identical stimuli are repeated, with ISI of 2.5 s (24).…”

Section: Discussionmentioning

confidence: 99%

Differences in waveforms of cerebral evoked potentials among healthy subjects, schizophrenics, manic-depres-sives and epileptics

et al. 2007

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“…Z values usually exceeded 0 99 when assessing a component present in two sets of averaged data Fig. 17A; Tomberg et al 1989, their Fig. 7E).…”

Section: Discussionmentioning

confidence: 99%

“…Z can vary between 1 (identical topography with equal or proportional voltages) and -1 (mirror patterns symmetrical about zero). Z has been used so far for comparing topographies of components in two averaged responses Tomberg, Desmedt, Ozaki, Nguyen & Chalklin, 1989 . The contralateral P40 surface positivity involved eleven parieto-central scalp traces (Fig.…”

Section: Z Assessment Of Scalp Topographiesmentioning

confidence: 99%

Non‐averaged human brain potentials in somatic attention: the short‐latency cognition‐related P40 component.

Tomberg¹,

Desmedt²

1996

The Journal of Physiology

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1. Non-averaged scalp-recorded brain potentials were studied in humans during selective attention to randomly intermixed series of stimuli to fingers. Physiological tests were used for validating the presence or absence of the short-latency cognition-related P40 electrogeneses in parietal cortex in the response to a single-target stimulus (P40 signifies a positive polarity of about 40 ms peak latency). 2. To minimize interference from the electroencephalogram and noise we mapped single brain responses over the scalp and identified P40 topographies by an updated form of the numerical estimator Z for assessment of recorded potentials over time. We found that Z should exceed 0-96 for at least 15 ms for validation of the topographical congruity between the single P40 and an averaged P40 template. 3. Individual responses to 145 target finger stimuli correctly identified by the subject were analysed. P40 occurred only intermittently (34'5%) in a series of targets, but its voltage was unexpectedly large, exceeding the P40 voltage in averaged responses by a factor of about 10. 4. The usual assumption in the averaging method that the single brain responses combined in the average are stable but merely contaminated by unrelated noise was shown to be false for the cognition-related P40, which was considerably underestimated because of its intermittency in the averaged single trials. 5. The reaction time of the subject was on average 19% shorter in the trials in which a P40 was present, thus suggesting that P40 can influence subsequent perceptual processing by the brain in the same trial.6. The feasibility of identifying specific cognition-related electrogeneses in single brain responses opens up the study of momentary shifts in brain processing strategies thereby allowing the neurophysiology of cognition to be based in real time.

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Mapping somatosensory evoked potentials to finger stimulation at intervals of 450 to 4000 msec and the issue of habituation when assessing early cognitive components

Cited by 74 publications

References 27 publications

High Temporal Resolution Neuroimaging of Attentional and Somatosensory-Motor Processing in the Human Brain

High Temporal Resolution Neuroimaging of Attentional and Somatosensory-Motor Processing in the Human Brain

Differences in waveforms of cerebral evoked potentials among healthy subjects, schizophrenics, manic-depres-sives and epileptics

Non‐averaged human brain potentials in somatic attention: the short‐latency cognition‐related P40 component.

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