High gamma frequency oscillatory activity dissociates attention from intention in the human premotor cortex

Brovelli, Andrea; Lachaux, Jean-Philippe; Kahane, Philippe; Boussaoud, Driss

doi:10.1016/j.neuroimage.2005.05.045

Cited by 151 publications

(133 citation statements)

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“…Next to their clinical importance, invasive recordings offer unique opportunities for electrophysiological investigations of human brain function with high spatial and temporal accuracy. An increasing number of studies have recently investigated motor Brovelli et al, 2005;Crone et al, 1998;Rektor, 2000;Szurhaj et al, 2006), sensory (Crone et al, 2001a;Edwards et al, 2005;Steinschneider et al, 2005), and cognitive (Canolty et al, 2006;Crone et al, 2001b;Ray et al, 2008;Sederberg et al, 2007;Sinai et al, 2005) systems using invasive EEG data. Furthermore, ECoG recordings have been proposed as a technology for brain-machine interfaces (BMIs) for neuronal motor prostheses in paralyzed patients (Ball et al, 2009;Leuthardt et al, 2004;Mehring et al, 2004;Pistohl et al, 2008;Schalk et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Signal quality of simultaneously recorded invasive and non-invasive EEG

et al. 2009

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Both invasive and non-invasive electroencephalographic (EEG) recordings from the human brain have an increasingly important role in neuroscience research and are candidate modalities for medical brainmachine interfacing. It is often assumed that the major artifacts that compromise non-invasive EEG, such as caused by blinks and eye movement, are absent in invasive EEG recordings. Quantitative investigations on the signal quality of simultaneously recorded invasive and non-invasive EEG in terms of artifact contamination are, however, lacking. Here we compared blink related artifacts in non-invasive and invasive EEG, simultaneously recorded from prefrontal and motor cortical regions using an approach suitable for detection of small artifact contamination. As expected, we find blinks to cause pronounced artifacts in noninvasive EEG both above prefrontal and motor cortical regions. Unexpectedly, significant blink related artifacts were also found in the invasive recordings, in particular in the prefrontal region. Computing a ratio of artifact amplitude to the amplitude of ongoing brain activity, we find that the signal quality of invasive EEG is 20 to above 100 times better than that of simultaneously obtained non-invasive EEG. Thus, while our findings indicate that ocular artifacts do exist in invasive recordings, they also highlight the much better signal quality of invasive compared to non-invasive EEG data. Our findings suggest that blinks should be taken into account in the experimental design of ECoG studies, particularly when event related potentials in fronto-anterior brain regions are analyzed. Moreover, our results encourage the application of techniques for reducing ocular artifacts to further optimize the signal quality of invasive EEG.

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Section: Introductionmentioning

confidence: 99%

Signal quality of simultaneously recorded invasive and non-invasive EEG

et al. 2009

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“…Human electroencephalography (EEG) studies provided evidence that oscillatory activity in the gamma band is correlated with the perception of coherent objects (Keil et al, 1999;Rodriguez et al, 1999;Gruber and Müller, 2005;Martinovic et al, 2008). Most EEG gamma-band studies have focused on lower gamma-band frequencies (Ͻ60 Hz); however, recent magnetoencephalography (MEG) and intracranial EEG studies have shown that oscillations in the high-frequency gamma band (Ͼ60 Hz) are reliable markers of cortical activity during a variety of cognitive tasks (Crone et al, 2001;Kaiser et al, 2004;Brovelli et al, 2005;Lachaux et al, 2005;Hoogenboom et al, 2006;Vidal et al, 2006;Guggisberg et al, 2007;Siegel et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Neuroelectromagnetic Correlates of Perceptual Closure Processes

Grützner¹,

Uhlhaas²,

Genç³

et al. 2010

Journal of Neuroscience

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Perceptual closure refers to the coherent perception of an object under circumstances when the visual information is incomplete. Although the perceptual closure index observed in electroencephalography reflects that an object has been recognized, the full spatiotemporal dynamics of cortical source activity underlying perceptual closure processing remain unknown so far. To address this question, we recorded magnetoencephalographic activity in 15 subjects (11 females) during a visual closure task and performed beamforming over a sequence of successive short time windows to localize high-frequency gamma-band activity (60 -100 Hz). Two-tone images of human faces (Mooney faces) were used to examine perceptual closure. Event-related fields exhibited a magnetic closure index between 250 and 325 ms. Time-frequency analyses revealed sustained high-frequency gamma-band activity associated with the processing of Mooney stimuli; closure-related gamma-band activity was observed between 200 and 300 ms over occipitotemporal channels. Time-resolved source reconstruction revealed an early (0 -200 ms) coactivation of caudal inferior temporal gyrus (cITG) and regions in posterior parietal cortex (PPC). At the time of perceptual closure (200 -400 ms), the activation in cITG extended to the fusiform gyrus, if a face was perceived. Our data provide the first electrophysiological evidence that perceptual closure for Mooney faces starts with an interaction between areas related to processing of three-dimensional structure from shading cues (cITG) and areas associated with the activation of long-term memory templates (PPC). Later, at the moment of perceptual closure, inferior temporal cortex areas specialized for the perceived object are activated, i.e., the fusiform gyrus related to face processing for Mooney stimuli.

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“…Recent iEEG studies have put a strong emphasis on gamma band activations in particular, in association with a wide range of cognitive processes, including memory (Fell et al, 2001;Howard et al, 2003;Mainy et al, 2007), visual attention and perception (Brovelli et al, 2005;Lachaux et al, 2000Lachaux et al, , 2005Tallon-Baudry et al, 2005;Tanji et al, 2005), audition (Bidet-Caulet et al, 2003;Edwards et al, 2005), somatosensory and motor processes Crone, Sinai and Korzeniewska, 2006;Lachaux et al, 2005;Aoki et al, 1999;Pfurtscheller et al, 2003;Szurhaj et al, 2005), and language . Importantly, in all those studies, gamma band activity was observed only in very specific brain regions, dependant on the tasks, and in good agreement with the functional networks revealed by fMRI .…”

Section: Introductionmentioning

confidence: 99%

Parieto-frontal gamma band activity during the perceptual emergence of speech forms

et al. 2008

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The multistable perception of speech refers to the perceptual changes experienced while listening to a speech form cycled in rapid and continuous repetition, the so-called Verbal Transformation Effect. Because distinct interpretations of the same repeated stimulus alternate spontaneously, this effect provides an invaluable tool to examine how speech percepts are formed in the listener's mind. In order to track the temporal dynamics of brain activity specifically linked to perceptual changes, intracerebral EEG activity was recorded from two implanted epileptic patients while performing a verbal transformation task. To this aim, they were asked to carefully listen to a speech sequence played repeatedly and to press a button whenever they perceived a change in the repeated utterance. For both patients, 300-800 ms prior to the reported perceptual transitions, high frequency activity in the gamma band range (> 40 Hz) was observed within the left inferior frontal and supramarginal gyri. An additional auditory decision task was used to rule out the possibility that the increased gamma band activity was due to the patients' motor responses. These results suggest that articulatory-based representations play a key part in the endogenously driven emergence of auditory speech percepts. The findings are interpreted in relation to theories assuming a link between perception and action in the human speech processing system.

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High gamma frequency oscillatory activity dissociates attention from intention in the human premotor cortex

Cited by 151 publications

References 35 publications

Signal quality of simultaneously recorded invasive and non-invasive EEG

Signal quality of simultaneously recorded invasive and non-invasive EEG

Neuroelectromagnetic Correlates of Perceptual Closure Processes

Parieto-frontal gamma band activity during the perceptual emergence of speech forms

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