On-line brain potential correlates of right parietal patients' attentional deficit

Verleger, Rolf; Heide, Wolfgang; Butt, Christian; Wascher, Edmund; Kömpf, Detlef

doi:10.1016/s0013-4694(96)95645-x

Cited by 46 publications

(27 citation statements)

References 41 publications

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“…Also, frontoparietal theta activity has been linked to cognitive control and performance monitoring in association with working memory (Cohen, 2011;Gulbinaite et al, 2014). Notably, the timing of maximal FP theta synchronization observed here (around 160 ms after stimulus onset) is in the latency range of visual N1 ERP component where major effects of visual attention have been consistently observed (Luck et al, 2000;Verleger et al, 1996;Herrmann and Knight, 2001). In the same latency range, event-related theta oscillations have been correlated with attention and working memory mechanisms during target discrimination (Yordanova et al, 2006).…”

Section: Fronto-parietal Theta Synchronization During Visual Processingsupporting

confidence: 50%

Synchronization of fronto-parietal beta and theta networks as a signature of visual awareness in neglect

et al. 2017

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The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. In the neglect syndrome, the perceptual deficit for contra-lesional hemi-space is increasingly viewed as a dysfunction of fronto-parietal cortical networks, the disruption of which has been described in neuroanatomical and hemodynamic studies. Here we exploit the superior temporal resolution of electroencephalography (EEG) to study dynamic transient connectivity of fronto-parietal circuits at early stages of visual perception in neglect. As reflected by interregional phase synchronization in a full-field attention task, two functionally distinct frontoparietal networks, in beta (15-25 Hz) and theta (4-8 Hz) frequency bands, were related to stimulus discrimination within the first 200 ms of visual processing. Neglect pathology was specifically associated with significant suppressions of both beta and theta networks engaging right parietal regions. These connectivity abnormalities occurred in a pattern that was distinctly different from what was observed in right-hemisphere lesion patients without neglect. Also, both beta and theta abnormalities contributed additively to visual awareness decrease, quantified in the Behavioural Inattention Test. These results provide evidence for the impairment of fast dynamic fronto-parietal interactions during early stages of visual processing in neglect pathology. Also, they reveal that different modes of fronto-parietal dysfunction contribute independently to deficits in visual awareness at the behavioural level.

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Section: Fronto-parietal Theta Synchronization During Visual Processingsupporting

confidence: 50%

Synchronization of fronto-parietal beta and theta networks as a signature of visual awareness in neglect

et al. 2017

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“…[25,26]; see also [15,41]), except that we now applied ERP measures to study tactile rather than visual extinction. We recorded SEPs from patient ED, who had left tactile extinction as a result of unilateral right-hemisphere damage.…”

Section: Discussionmentioning

confidence: 99%

“…Previous evidence for this has come primarily from visual rather than tactile studies (e.g. [25][26][27]41]; see also [3,9]). For instance, Marzi et al [25,26] recently reported reduced visual N1 components at posterior electrodes contralateral to left unilateral visual stimuli, in right-hemisphere patients with left visual extinction.…”

Section: Discussionmentioning

confidence: 99%

The electrophysiology of tactile extinction: ERP correlates of unconscious somatosensory processing

et al. 2002

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“…Second, the detection without recognition of threshold auditory stimuli was associated with the modulation of early N1 component (peak around 100-ms post-stimulus), whereas stimulus recognition other than detection was concomitant with the modulation of the P3 [Parasuraman and Beatty, 1980]. Third, visuo-spatial stimulation induced a prominent occipital and/or parietal activation not only in normal subjects [Brandeis and Lehmann, 1986;Brazdil et al, 1998Brazdil et al, , 2001Brazdil et al, , 2002Kostandov and Arzumanov, 1977;Ress and Heeger, 2003;Sergent et al, 2005;Shefrin et al, 1988;Shevrin, 1976] but also in patients suffering from deficits of visual primary consciousness, namely subjects with ''visual extinction'' [Driver, 1996;Driver and Mattingley, 1998;Driver et al, 1997Heilman et al, 1997;Lhermitte et al, 1985;Marzi et al, 2000;Robertson et al, 1997;Spinelli et al, 1994;Vallar et al, 1991;Verleger et al, 1996;Vuilleumier et al, 2001]. Fourth, late single-neuron activity (after about 100-ms post-stimulus) was selectively suppressed in monkey's primary visual cortex when the stimuli were not consciously perceived [Super et al, 2001].…”

Section: Primary Consciousness During Visual Executive Processesmentioning

confidence: 99%

“…Neural correlates of the conscious and unconscious visual processes have been studied in patients with unilateral brain lesions, particularly at the right posterior parietal cortex Driver et al, 1997;Vallar et al, 1988]. During bilateral stimulations, these patients typically miss contralesional stimuli at the left visual hemifield (visual extinction), probably due to a pathological bias in visuo-spatial attention [Cocchini et al, 1999;Desimone and Duncan, 1995;Driver et al, 1997;Posner et al, 1984;Vallar et al, 1988] and abnormal processes in parieto-occipital cortical areas Lhermitte et al, 1985;Marzi et al, 2000Marzi et al, , 2001Spinelli et al, 1994;Vallar et al, 1991;Verleger et al, 1996;Vuilleumier et al, 2001].…”

Section: Introductionmentioning

confidence: 99%

Cortical sources of visual evoked potentials during consciousness of executive processes

Babiloni

Vecchio

Iacoboni

et al. 2008

Human Brain Mapping

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What is the timing of cortical activation related to consciousness of visuo-spatial executive functions? Electroencephalographic data (128 channels) were recorded in 13 adults. Cue stimulus briefly appeared on right or left (equal probability) monitor side for a period, inducing about 50% of recognitions. It was then masked and followed (2 s) by a central visual go stimulus. Left (right) mouse button had to be clicked after right (left) cue stimulus. This "inverted" response indexed executive processes. Afterward, subjects said "seen" if they had detected the cue stimulus or "not seen" when it was missed. Sources of event-related potentials (ERPs) were estimated by LORETA software. The inverted responses were about 95% in seen trials and about 60% in not seen trials. Cue stimulus evoked frontal-parietooccipital potentials, having the same peak latencies in the seen and not seen data. Maximal difference in amplitude of the seen and not seen ERPs was detected at about +300-ms post-stimulus (P3). P3 sources were higher in amplitude in the seen than not seen trials in dorsolateral prefrontal, premotor and parietooccipital areas. This was true in dorsolateral prefrontal and premotor cortex even when percentage of the inverted responses and reaction time were paired in the seen and not seen trials. These results suggest that, in normal subjects, the primary consciousness enhances the efficacy of visuo-spatial executive processes and is sub-served by a late (100- to 400-ms post-stimulus) enhancement of the neural synchronization in frontal areas.

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On-line brain potential correlates of right parietal patients' attentional deficit

Cited by 46 publications

References 41 publications

Synchronization of fronto-parietal beta and theta networks as a signature of visual awareness in neglect

Synchronization of fronto-parietal beta and theta networks as a signature of visual awareness in neglect

The electrophysiology of tactile extinction: ERP correlates of unconscious somatosensory processing

Cortical sources of visual evoked potentials during consciousness of executive processes

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