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Your search keyword '"Gabriel Gaudencio Rêgo"' showing total 2 results
Start Over Author "Gabriel Gaudencio Rêgo" Journal scientific reports
2 results on '"Gabriel Gaudencio Rêgo"'

1. Attention neuroenhancement through tDCS or neurofeedback: a randomized, single-blind, controlled trial

Author

Gabriel Gaudencio Rêgo, Óscar F. Gonçalves, and Paulo Sérgio Boggio

Subjects
Medicine, Science
Abstract

Abstract Neurofeedback and transcranial Direct Current Stimulation (tDCS) are promising techniques for neuroenhancement of attentional performance. As far as we know no study compared both techniques on attentional performance in healthy participants. We compared tDCS and neurofeedback in a randomized, single-blind, controlled experiment assessing both behavioral (accuracy and time reaction) and electrophysiological (N1, P1, and P3 components) data of participants responding to the Attention Network Task (ANT). Eighty volunteers volunteered for this study. We adopted standard protocols for both techniques, i.e., a Sensorimotor Rhythm (SMR) protocol for neurofeedback and the right DLPFC anodal stimulation for tDCS, applied over nine sessions (two weeks). We did not find significant differences between treatment groups on ANT, neither at the behavioral nor at the electrophysiological levels. However, we found that participants from both neuromodulation groups, irrespective of if active or sham, reported attentional improvements in response to the treatment on a subjective scale. Our study adds another null result to the neuromodulation literature, showing that neurofeedback and tDCS effects are more complex than previously suggested and associated with placebo effect. More studies in neuroenhancement literature are necessary to fully comprehend neuromodulation mechanisms.

Published
2022
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2. Neural Signatures of the Configural Superiority Effect and Fundamental Emergent Features in Human Vision

Author

James R. Pomerantz, Johan Wagemans, Thiago Leiros Costa, Kimberley D. Orsten-Hooge, Paulo S. Boggio, and Gabriel Gaudencio Rêgo

Subjects
SELECTION, Adult, Male, Visual perception, Computer science, media_common.quotation_subject, lcsh:Medicine, Stimulus (physiology), WHOLES, 050105 experimental psychology, 03 medical and health sciences, Young Adult, 0302 clinical medicine, Form perception, Event-related potential, Perception, Reaction Time, Humans, 0501 psychology and cognitive sciences, Attention, lcsh:Science, Evoked Potentials, media_common, Cognitive science, Generality, Neural correlates of consciousness, PERCEPTION, Multidisciplinary, Science & Technology, PARTS, 05 social sciences, lcsh:R, SUM, VISUAL-SYSTEM, ATTENTION, GESTALT PSYCHOLOGY, COMPONENT, Multidisciplinary Sciences, Form Perception, Pattern Recognition, Visual, Visual Perception, Gestalt psychology, Science & Technology - Other Topics, lcsh:Q, Female, INTEGRATION, 030217 neurology & neurosurgery, Photic Stimulation
Abstract

The concepts of grouping, emergence, and superadditivity (when a whole is qualitatively different from the sum of its parts) are critical in Gestalt psychology and essential to properly understand the information processing mechanisms underlying visual perception. However, very little is known about the neural processes behind these phenomena (particularly in terms of their generality vs. specificity and their time-course). Here, we used the configural superiority effect as a way to define "emergence" and "emergent features" operationally, employing an approach that can isolate different emergent features and compare them on a common scale. By assessing well-established event related potentials in a HD-EEG system, we found that the critical processes behind configural superiority and superadditive Gestalt phenomena are present in the window between 100 and 200 ms after stimulus onset and that these effects seem to be driven by specific attentional selection mechanisms. Also, some emergent features seem to be differentially processed in different brain hemispheres. These results shed new light on the issues of the generality vs. specificity of the neural correlates of different Gestalt principles, the hemispheric asymmetries in the processing of hierarchical image structure and the role of the N1 ERP component in reflecting feature selective mechanisms. ispartof: SCIENTIFIC REPORTS vol:8 issue:1 ispartof: location:England status: published

Published
2018

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