T
Tomás Ossandón
Researcher at Pontifical Catholic University of Chile
Publications - 43
Citations - 1749
Tomás Ossandón is an academic researcher from Pontifical Catholic University of Chile. The author has contributed to research in topics: Electroencephalography & Prefrontal cortex. The author has an hindex of 18, co-authored 41 publications receiving 1433 citations. Previous affiliations of Tomás Ossandón include Centre national de la recherche scientifique & Claude Bernard University Lyon 1.
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Journal ArticleDOI
Task-related gamma-band dynamics from an intracerebral perspective: review and implications for surface EEG and MEG.
Karim Jerbi,Tomás Ossandón,Carlos M. Hamamé,S. Senova,S. Senova,Sarang S. Dalal,Julien Jung,Lorella Minotti,Olivier Bertrand,Alain Berthoz,Philippe Kahane,Jean-Philippe Lachaux +11 more
TL;DR: The characteristics of invasive data acquired from implanted epilepsy patients using stereotactic‐electroencephalography (SEEG) and electrocorticography (ECoG) and the use of spectral analysis to reveal task‐related modulations in multiple frequency components are discussed.
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Transient Suppression of Broadband Gamma Power in the Default-Mode Network Is Correlated with Task Complexity and Subject Performance
Tomás Ossandón,Karim Jerbi,Juan R. Vidal,Dimitri J. Bayle,Marie-Anne Hénaff,Julien Jung,Lorella Minotti,Olivier F. Bertrand,Philippe Kahane,Jean-Philippe Lachaux +9 more
TL;DR: Using extensive depth electrode recordings in humans, first electrophysiological evidence for a direct correlation between the dynamics of power decreases in the DMN and individual subject behavior is provided and a pivotal role for broadband gamma modulations in the interplay between task-positive and task-negative networks mediating efficient goal-directed behavior is revealed.
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Exploring the Electrophysiological Correlates of the Default-Mode Network with Intracerebral EEG
Karim Jerbi,Karim Jerbi,Juan R. Vidal,Juan R. Vidal,Tomás Ossandón,Tomás Ossandón,Sarang S. Dalal,Sarang S. Dalal,Julien Jung,Julien Jung,Dominique Hoffmann,Lorella Minotti,Olivier F. Bertrand,Olivier F. Bertrand,Philippe Kahane,Jean-Philippe Lachaux,Jean-Philippe Lachaux +16 more
TL;DR: It is argued that stereotactic-electroencephalography, which consists of implanting multiple depth electrodes for pre-surgical evaluation in drug-resistant epilepsy, is particularly suited for this endeavor and is supported by rare data from depth recordings in human posterior cingulate cortex and medial prefrontal cortex that show transient neural deactivation during task-engagement.
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Category-Specific Visual Responses: An Intracranial Study Comparing Gamma, Beta, Alpha, and ERP Response Selectivity
Juan R. Vidal,Tomás Ossandón,Karim Jerbi,Sarang S. Dalal,Lorella Minotti,Philippe Ryvlin,Philippe Kahane,Jean-Philippe Lachaux +7 more
TL;DR: Overall, it is found that selective neural responses to visual objects were broadly distributed in the brain with a prominent spatial cluster located in the posterior temporal cortex.
Journal ArticleDOI
How silent is silent reading? Intracerebral evidence for top-down activation of temporal voice areas during reading.
Marcela Perrone-Bertolotti,Jan Kujala,Juan R. Vidal,Carlos M. Hamamé,Tomás Ossandón,Olivier F. Bertrand,Lorella Minotti,Philippe Kahane,Karim Jerbi,Jean-Philippe Lachaux +9 more
TL;DR: The results demonstrate that the multimodal mental experience of reading is in fact a heterogeneous complex of asynchronous neural responses, and that auditory and visual modalities often process distinct temporal frames of the authors' environment at the same time.