1,721,023 research outputs found
Preprocessed EEG data
No full textThis dataset consists of the preprocessed EEG data from 15 participants in a speech perception experiment using virtual characters and synthetic speech. The EEG data for all participants are contained in large MATLAB data files. A text file briefly describes the content of each MATLAB data file
Investigating the function and plasticity of the large-scale somatosensory-motor cortical network of mice using EEG mapping techniques
No full textNous avons développé des méthodes permettant d'étudier de façon minimalement invasive la fonction du réseau neuronal somatosensoriel à large échelle chez la souris anesthésiée. Nous avons cartographié au moyen de 32 électrodes épicrâniennes l'activité électrique cérébrale en réponse à des déflections des vibrisses. Cette réponse impliquait plusieurs aires corticales somatosensorielles et motrices des deux hémisphères en une séquence spatiotemporelle stable. Des enregistrements intracorticaux ont montré qu'il existait une relation étroite entre l'activité corticale locale et la topographie des cartes épicrâniennes. Nous avons ensuite montré qu'une période de stimulation rythmique des vibrisses induisait une plasticité de longue durée dans le réseau sensorimoteur, comportant une augmentation des réponses évoquées dans le cortex somatosensoriel primaire et une diminution des réponses dans le cortex moteur. L'abolition de cette plasticité par l'élevage en environnement enrichi suggérait que cette plasticité pourrait jouer un rôle dans l'apprentissage perceptuel
Input and output data from the behavioral experiment
No full textThis dataset consists of the input and output data (stored as comma-separated values files) from a custom-designed behavioral experiment on the perception of artificial but naturalistic audiovisual speech.
24 participants attended the experiment. Each participant ran 2 blocks. Consequently, there are 2 input .csv files and 2 output .csv files per participant.
Additionally, a MATLAB script to upload the data and make them available for further analysis is provided
The neuronal mechanisms that underlie auditory and visual perception in the human brain studied by direct electrical recordings and stimulation
No full textWe are who we are through our brains. In the armamentarium of scientists who study the human brain, intracranial EEG holds a special place. Intracranial EEG refers to recordings of the brain's activity from within the skull, in immediate contact with the brain's tissue. The technique is necessary in the management of a handful of medical conditions. Thanks to the ingenuity of physicians and the selflessness of patients, it can also reveal how neuronal activity underlies normal cerebral functions. In this collection of articles, I highlight the power and versatility of intracranial EEG to reveal the neuronal underpinnings of cerebral function in humans
Electric source imaging for presurgical epilepsy evaluation: current status and future prospects
No full textIntroduction: Electric source imaging (ESI) refers to the estimation of the cerebral sources of electric signals recorded at the head surface using electroencephalography (EEG). Thanks to the availability of EEG systems with high numbers of electrodes and to progress in software to analyze the signals they collect, ESI can be applied to epilepsy-related pathological EEG signals like interictal spikes and seizures.Areas covered: In this narrative review, we discuss selected original research articles on the use of ESI in epilepsy patients considered for surgery. Epilepsy-related activity can be localized accurately using ESI, as established by comparison to the gold standards of intracranial EEG and seizure control following epilepsy surgery. The information brought by ESI complements successfully that of other techniques like magnetic resonance imaging and positron-emission tomography, and is clinically relevant to patient management.Expert opinion: EEG is a readily available technique to measure brain activity in real time. Given its accuracy and usefulness, ESI should become part of the routine practice of clinical neurophysiology laboratories and epilepsy centers in the presurgical management of epilepsy patients
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Naturalistic audiovisual illusions reveal the cortical sites involved in the multisensory processing of speech
No full textAudiovisual speech illusions are a spectacular illustration of the effect of visual cues on the perception of speech. Because they allow dissociating perception from the physical characteristics of the sensory inputs, these illusions are useful to investigate the cerebral processing of audiovisual speech. However, the meaningless, monosyllabic utterances typically used to induce illusions are far removed from natural communication through speech. We developed naturalistic speech stimuli that embed mismatched auditory and visual cues within grammatically correct sentences to induce illusory perceptions in controlled fashion. Using intracranial EEG, we confirmed that the cortical processing of audiovisual speech recruits an ensemble of areas, from auditory and visual cortices to multisensory and associative regions. Importantly, we were able to resolve which cortical areas are driven more by the auditory or the visual contents of the speech stimulus or by the eventual perceptual report. Our results suggest that higher order sensory and associative areas, rather than early sensory cortices, are key loci for illusory perception. Naturalistic audiovisual speech illusions represent a powerful tool to dissect the specific roles of individual cortical areas in the processing of audiovisual speech
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