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Convergent evidence for hierarchical prediction networks from human electrocorticography and magnetoencephalography

Mostrar el registro sencillo del ítem Phillips, Holly N. Blenkmann, Alejandro Hughes, Laura Kochen, Silvia Bekinschtein, Tristan Can, Cam Rowe, James 2016-05-17T15:51:02Z 2016-05-17T15:51:02Z 2016
dc.identifier.issn 0010-9452
dc.description Fil: Kochen, S. Hospital de Alta Complejidad en Red El Cruce Dr. Néstor C. Kirchner. Centro Nacional de Alta Complejidad en Neurociencias y Neurocirugía. Florencio Varela, Argentina. es_AR
dc.description.abstract We propose that sensory inputs are processed in terms of optimised predictions and prediction error signals within hierarchical neurocognitive models. The combination of non-invasive brain imaging and generative network models has provided support for hierarchical frontotemporal interactions in oddball tasks, including recent identification of a temporal expectancy signal acting on prefrontal cortex. However, these studies are limited by the need to invert magnetoencephalographic or electroencephalographic sensor signals to localise activity from cortical ‘nodes’ in the network, or to infer neural responses from indirect measures such as the fMRI BOLD signal. To overcome this limitation, we examined frontotemporal interactions estimated from direct cortical recordings from two human participants with cortical electrode grids (electrocorticography). Their frontotemporal network dynamics were compared to those identified by magnetoencephalography in forty healthy adults. All participants performed the same auditory oddball task with standard tones interspersed with five deviant tone types. We normalised post-operative electrode locations to standardised anatomic space, to compare across modalities, and inverted the MEG to cortical sources using the estimated lead field from subject-specific head models. A mismatch negativity signal in frontal and temporal cortex was identified in all subjects. Generative models of the electrocorticographic and magnetoencephalographic data were separately compared using the free-energy estimate of the model evidence. Model comparison confirmed the same critical features of hierarchical frontotemporal networks in each patient as in the group-wise magnetoencephalography. These features included bilateral, feedforward and feedback frontotemporal modulated connectivity, in addition to an asymmetric expectancy driving input on left frontal cortex. The invasive electrocorticography provides an important step in construct validation of the use of neural generative models of magnetoencephalography, which in turn enables generalisation to larger populations. Together, they give convergent evidence for the hierarchical interactions in frontotemporal networks for expectation and processing of sensory inputs. es_AR
dc.language.iso es es_AR
dc.subject Electrocorticografía es_AR
dc.subject Magnetoencefalografía es_AR
dc.subject Técnicas de Diagnóstico Neurológico es_AR
dc.subject Cognición es_AR
dc.title Convergent evidence for hierarchical prediction networks from human electrocorticography and magnetoencephalography es_AR
dc.type Article es_AR

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