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Patrícia B Silva, Karen Ueki, Darlene G Oliveira, Paulo S Boggio, Elizeu C Macedo
The aim of this study was to verify which stages of language processing are impaired in individuals with dyslexia. For this, a visual-auditory crossmodal task with semantic judgment was used. The P100 potentials were chosen, related to visual processing and initial integration, and N400 potentials related to semantic processing. Based on visual-auditory crossmodal studies, it is understood that dyslexic individuals present impairments in the integration of these two types of tasks and impairments in processing spoken and musical auditory information...
2016: Frontiers in Psychology
Suellen M Andrade, Natanael A Santos, Bernardino Fernández-Calvo, Paulo S Boggio, Eliane A Oliveira, José J Ferreira, Amanda Sobreira, Felipe Morgan, Germana Medeiros, Gyovanna S Cavalcanti, Ingrid D Gadelha, Jader Duarte, Joercia Marrocos, Michele A Silva, Thatiana Rufino, Sanmy R Nóbrega
BACKGROUND: Traditional treatment for motor impairment after stroke includes medication and physical rehabilitation. The transcranial direct current stimulation associated with a standard physical therapy program may be an effective therapeutic alternative for these patients. METHODS: This study is a sham-controlled, double-blind, randomized clinical trial aiming to evaluate the efficacy of transcranial direct current stimulation in activities of daily living and motor function post subacute stroke...
2016: Trials
Marie-Anne Vanderhasselt, Rudi De Raedt, Victoria Namur, Leandro C L Valiengo, Paulo A Lotufo, Isabela M Bensenor, Chris Baeken, Paulo S Boggio, Andre R Brunoni
Emotional Context Insensitivity (ECI) is a psychological feature observed in depressed patients characterized by a decreased emotional reactivity when presented to positive- and negative valence-loaded stimuli. Given that fronto-cingulate-limbic circuits are implicated in abnormal reactivity to valence-loaded stimuli, neurocognitive treatments engaging the prefrontal cortex may be able to modulate this emotional blunting observed in MDD. Therefore, our goal was to evaluate emotional reactivity in depressed patients before and after a combination of neurocognitive interventions that engage the prefrontal cortex (cognitive control training and/or transcranial direct current stimulation)...
January 15, 2016: Journal of Affective Disorders
Thiago L Costa, Ana Luiza C Zaninotto, Gláucia G Benute, Mara C S De Lúcia, Wellingson S Paiva, Johan Wagemans, Paulo S Boggio
Traumatic brain injury (TBI) is a prevalent condition and there is limited visual perception research with this population. Here, we investigated perceptual organization changes in a rather homogeneous sample of closed head TBI outpatients with diffuse axonal injury only and no other known comorbidities. Patients had normal or corrected visual acuity. Perceptual organization was measured with the Leuven Perceptual Organization Screening Test (L-POST), a coherent motion task (CM) and the Leuven Embedded Figures Test (L-EFT)...
November 2015: Neuropsychologia
Paulo S Boggio, Manish K Asthana, Thiago L Costa, Cláudia A Valasek, Ana A C Osório
Being socially connected directly impacts our basic needs and survival. People with deficits in social cognition might exhibit abnormal behaviors and face many challenges in our highly social-dependent world. These challenges and limitations are associated with a substantial economical and subjective impact. As many conditions where social cognition is affected are highly prevalent, more treatments have to be developed. Based on recent research, we review studies where non-invasive neuromodulatory techniques have been used to promote Social Plasticity in developmental disorders...
2015: Frontiers in Neuroscience
Thiago L Costa, Olivia M Lapenta, Paulo S Boggio, Dora F Ventura
Transcranial direct current stimulation (tDCS) is a non-invasive neuromodulatory technique with increasing popularity in the fields of basic research and rehabilitation. It is an affordable and safe procedure that is beginning to be used in the clinic, and is a tool with potential to contribute to the understanding of neural mechanisms in the fields of psychology, neuroscience, and medical research. This review presents examples of investigations in the fields of perception, basic sensory processes, and sensory rehabilitation that employed tDCS...
August 2015: Attention, Perception & Psychophysics
Gabriel G Rêgo, Olívia M Lapenta, Lucas M Marques, Thiago L Costa, Jorge Leite, Sandra Carvalho, Óscar F Gonçalves, André R Brunoni, Felipe Fregni, Paulo S Boggio
The dorsolateral prefrontal cortex (DLPFC) is involved in the cognitive appraisal and modulation of the pain experience. In this sham-controlled study, with healthy volunteers, we used bi-hemispheric transcranial direct current stimulation (tDCS) over the DLPFC to assess emotional reactions elicited by pain observation. Left-cathodal/right-anodal tDCS decreased valence and arousal evaluations compared to other tDCS conditions. Compared to sham condition, both left-cathodal/right-anodal and left-anodal/right-cathodal tDCS decreased hostility, sadness and self-pain perception...
May 6, 2015: Neuroscience Letters
Thiago L Costa, Mirella Gualtieri, Mirella T S Barboni, Rafael K Katayama, Paulo S Boggio, Dora F Ventura
Recent research suggested that transcranial direct current stimulation (tDCS) can affect visual processing and that it can be useful in visual rehabilitation. Nevertheless, there are still few investigations on the subject. tDCS selectivity and the extent of its outcomes on visual perception are still to be assessed. Here, we investigate whether central and peripheral visual fields are equally affected by tDCS. We also tried to reproduce a previous work that has evaluated tDCS effects on the central visual field only (Kraft et al...
May 2015: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Thiago L Costa, Russell D Hamer, Balázs V Nagy, Mirella T S Barboni, Mirella Gualtieri, Paulo S Boggio, Dora F Ventura
Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique that can modulate cortical activity. Nonetheless, information regarding its functional specificity and the extent by which visual performance can be modulated is still lacking. Here, we used vision as model to address if it differentially affects different cell groups in the stimulated area. We applied tDCS to the occiput and performed a series of visual tests in a sham-controlled repeated-measures design. Achromatic contrast sensitivity was assessed psychophysically during tDCS, with tasks designed to target specific spatial frequency (SF) channels, inferred ON, OFF channels and inferred magnocellular and parvocellular pathways of the visual system...
April 2015: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Thiago L Costa, Marcelo F Costa, Adsson Magalhães, Gabriel G Rêgo, Balázs V Nagy, Paulo S Boggio, Dora F Ventura
Recent research suggests that V1 plays an active role in the judgment of size and distance. Nevertheless, no research has been performed using direct brain stimulation to address this issue. We used transcranial direct-current stimulation (tDCS) to directly modulate the early stages of cortical visual processing while measuring size and distance perception with a psychophysical scaling method of magnitude estimation in a repeated-measures design. The subjects randomly received anodal, cathodal, and sham tDCS in separate sessions starting with size or distance judgment tasks...
February 19, 2015: Neuroscience Letters
Sandra Carvalho, Paulo S Boggio, Óscar F Gonçalves, Ana Rita Vigário, Marisa Faria, Soraia Silva, Gabriel Gaudencio do Rego, Felipe Fregni, Jorge Leite
BACKGROUND: It has been already shown that delivering tDCS that are spaced by an interval alters its impact on motor plasticity. These effects can be explained, based on metaplasticity in which a previous modification of activity in a neuronal network can change the effects of subsequent interventions in the same network. But to date there is limited data assessing metaplasticity effects in cognitive functioning. OBJECTIVES: The aim of this study was to test several tDCS-based metaplasticity protocols in working memory (WM), by studying the impact of various interstimulation intervals in the performance of a 3-back task...
March 2015: Brain Stimulation
Marie-Anne Vanderhasselt, Rudi De Raedt, Victoria Namur, Paulo A Lotufo, Isabela M Bensenor, Paulo S Boggio, Andre R Brunoni
Rumination is a cognitive-affective thinking style that plays a key role in the onset and maintenance of depression. Recently, it was shown that clinically depressed patients who received a neurocognitive training - involving two weeks of repetitive cognitive control exercises that necessitate prefrontal engagement - are more able to control over ruminative negative thoughts than patients who only received treatment as usual. Transcranial Direct Current Stimulation (tDCS) is a biological technique that can directly modulate prefrontal excitability via the manipulation of neural membrane potentials...
March 3, 2015: Progress in Neuro-psychopharmacology & Biological Psychiatry
Fabiana Guarienti, Wolnei Caumo, Pedro Shiozawa, Quirino Cordeiro, Paulo S Boggio, Isabela M Benseñor, Paulo A Lotufo, Marom Bikson, André R Brunoni
OBJECTIVES: Transcranial direct current stimulation (tDCS)-induced erythema (skin reddening) has been described as an adverse effect that can harm blinding integrity in sham-controlled designs. To tackle this issue, we investigated whether the use of topical pretreatments could decrease erythema and other adverse effects associated with tDCS. MATERIALS AND METHODS: Thirty healthy volunteers were recruited, and four interventions were applied 30 min prior to tDCS in a Latin square design: placebo, ketoprofen 2%, hydroxyzine 1%, and lidocaine 5%...
June 2015: Neuromodulation: Journal of the International Neuromodulation Society
Marie-Anne Vanderhasselt, Andre R Brunoni, Tom Loeys, Paulo S Boggio, Rudi De Raedt
It becomes ever more evident that cognitive operations serve as fundamental mechanisms underlying higher order ruminative thoughts. In this sham controlled within subjects study, we performed anodal transcranial Direct Current Stimulation (tDCS) over the left dorsolateral prefrontal cortex (DLPFC) in 32 healthy participants. We tested the causal hypothesis that the relationship between DLPFC activity and ruminative thinking is mediated by working memory operations. We used the Internal Shift Task, a paradigm in which participants have to update and shift between specific (non)emotional representations in working memory...
November 2013: Neuropsychologia
Ana C A Giglio, Ludovico Minati, Paulo S Boggio
Integrative semantic processing and mirror-neuron system activation in response to incongruence detection during action observation have so far been investigated only through paradigms that involve unfeasible action endings, introduction of extraneous objects or synthetic pictures. The ecological validity of the reported effects, particularly modulation of the N400 event-related potential (ERP), therefore remains questionable. To address this shortcoming, we investigated the ERPs evoked by physically feasible and naturalistic but unexpected action endings...
September 26, 2013: Brain Research
Olivia M Lapenta, Ludovico Minati, Felipe Fregni, Paulo S Boggio
Motor system neural networks are activated during movement imagery, observation and execution, with a neural signature characterized by suppression of the Mu rhythm. In order to investigate the origin of this neurophysiological marker, we tested whether transcranial direct current stimulation (tDCS) modifies Mu rhythm oscillations during tasks involving observation and imagery of biological and non-biological movements. We applied tDCS (anodal, cathodal, and sham) in 21 male participants (mean age 23.8 ± 3...
2013: Frontiers in Human Neuroscience
Andre Russowsky Brunoni, Andrew H Kemp, Eduardo M Dantas, Alessandra C Goulart, Maria Angélica Nunes, Paulo S Boggio, José Geraldo Mill, Paulo A Lotufo, Felipe Fregni, Isabela M Benseñor
Decreased heart rate variability (HRV) is a cardiovascular predictor of mortality. Recent debate has focused on whether reductions in HRV in major depressive disorder (MDD) are a consequence of the disorder or a consequence of pharmacotherapy. Here we report on the impact of transcranial direct current stimulation (tDCS), a non-pharmacological intervention, vs. sertraline to further investigate this issue. The employed design was a double-blind, randomized, factorial, placebo-controlled trial. One hundred and eighteen moderate-to-severe, medication-free, low-cardiovascular risk depressed patients were recruited for this study and allocated to either active/sham tDCS (10 consecutive sessions plus two extra sessions every other week) or placebo/sertraline (50 mg/d) for 6 wk...
October 2013: International Journal of Neuropsychopharmacology
Andre Russowsky Brunoni, Tamires Araujo Zanao, Marie-Anne Vanderhasselt, Leandro Valiengo, Janaina Farias de Oliveira, Paulo S Boggio, Paulo A Lotufo, Isabela M Benseñor, Felipe Fregni
OBJECTIVE: Our aim was to evaluate whether one single section of transcranial direct current stimulation (tDCS), a neuromodulatory technique that noninvasively modifies cortical excitability, could induce acute changes in the negative attentional bias in patients with major depression. SUBJECTS AND METHODS: Randomized, double-blind, sham-controlled, parallel design enrolling 24 age-, gender-matched, drug-free, depressed subjects. Anode and cathode were placed over the left and right dorsolateral prefrontal cortex...
February 2014: Neuromodulation: Journal of the International Neuromodulation Society
Marie-Anne Vanderhasselt, Rudi De Raedt, Andre R Brunoni, Camila Campanhã, Chris Baeken, Jonathan Remue, Paulo S Boggio
Transcranial Direct Current Stimulation (tDCS) is a neuromodulation technique with promising results for enhancing cognitive information processes. So far, however, research has mainly focused on the effects of tDCS on cognitive control operations for non-emotional material. Therefore, our aim was to investigate the effects on cognitive control considering negative versus positive material. For this sham-controlled, within-subjects study, we selected a homogeneous sample of twenty-five healthy participants...
2013: PloS One
Tatiane C Ribeiro, Claudia A Valasek, Ludovico Minati, Paulo S Boggio
Autism spectrum disorders (ASDs) are characterized by impaired communication, particularly pragmatic and semantic language, resulting in verbal comprehension deficits. Semantic processing in these conditions has been studied extensively, but mostly limited only to linguistic material. Emerging evidence, however, suggests that semantic integration deficits may extend beyond the verbal domain. Here, we explored cross-modal semantic integration using visual targets preceded by musical and linguistic cues. Particularly, we have recorded the event-related potentials to evaluate whether the N400 and late positive potential (LPP) components, two widely studied electrophysiological markers of semantic processing, are differently sensitive to congruence with respect to typically developing children...
May 29, 2013: Neuroreport
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