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  1 / 37 MEDLINE  
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[PMID]:28122878
[Au] Autor:Pinto Y; Neville DA; Otten M; Corballis PM; Lamme VAF; de Haan EHF; Foschi N; Fabri M
[Ad] Endereço:Department of Psychology, University of Amsterdam, Amsterdam, The Netherlands.
[Ti] Título:Split brain: divided perception but undivided consciousness.
[So] Source:Brain;140(5):1231-1237, 2017 May 01.
[Is] ISSN:1460-2156
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In extensive studies with two split-brain patients we replicate the standard finding that stimuli cannot be compared across visual half-fields, indicating that each hemisphere processes information independently of the other. Yet, crucially, we show that the canonical textbook findings that a split-brain patient can only respond to stimuli in the left visual half-field with the left hand, and to stimuli in the right visual half-field with the right hand and verbally, are not universally true. Across a wide variety of tasks, split-brain patients with a complete and radiologically confirmed transection of the corpus callosum showed full awareness of presence, and well above chance-level recognition of location, orientation and identity of stimuli throughout the entire visual field, irrespective of response type (left hand, right hand, or verbally). Crucially, we used confidence ratings to assess conscious awareness. This revealed that also on high confidence trials, indicative of conscious perception, response type did not affect performance. These findings suggest that severing the cortical connections between hemispheres splits visual perception, but does not create two independent conscious perceivers within one brain.
[Mh] Termos MeSH primário: Estado de Consciência/fisiologia
Lateralidade Funcional/fisiologia
Procedimento de Encéfalo Dividido/efeitos adversos
Campos Visuais/fisiologia
Percepção Visual/fisiologia
[Mh] Termos MeSH secundário: Encéfalo/fisiologia
Seres Humanos
Testes de Campo Visual
[Pt] Tipo de publicação:CASE REPORTS; JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171030
[Lr] Data última revisão:
171030
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:170127
[St] Status:MEDLINE
[do] DOI:10.1093/brain/aww358


  2 / 37 MEDLINE  
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[PMID]:27677671
[Au] Autor:Laboni Roy P; Wu A; Dash C; Tellez-Zenteno JF
[Ad] Endereço:1Saskatchewan Epilepsy Program,Department of MedicineDivision of Neurology,University of SaskatchewanSaskatoon,Saskatchewan,Canada.
[Ti] Título:Delayed Response to Corpus Callosotomy.
[So] Source:Can J Neurol Sci;44(1):128-130, 2017 Jan.
[Is] ISSN:0317-1671
[Cp] País de publicação:England
[La] Idioma:eng
[Mh] Termos MeSH primário: Corpo Caloso/cirurgia
Epilepsia/cirurgia
Procedimento de Encéfalo Dividido/métodos
[Mh] Termos MeSH secundário: Eletroencefalografia
Epilepsia/diagnóstico por imagem
Feminino
Seres Humanos
Imagem por Ressonância Magnética
Procedimentos Neurocirúrgicos
Adulto Jovem
[Pt] Tipo de publicação:CASE REPORTS; JOURNAL ARTICLE
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160929
[St] Status:MEDLINE
[do] DOI:10.1017/cjn.2016.313


  3 / 37 MEDLINE  
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[PMID]:27746345
[Au] Autor:Prete G; Fabri M; Foschi N; Tommasi L
[Ad] Endereço:Department of Psychological Science, Health and Territory, "G. d'Annunzio" University of Chieti-Pescara, Italy. Electronic address: giulia.prete@unich.it.
[Ti] Título:Face gender categorization and hemispheric asymmetries: Contrasting evidence from connected and disconnected brains.
[So] Source:Neuroscience;339:210-218, 2016 Dec 17.
[Is] ISSN:1873-7544
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:We investigated hemispheric asymmetries in categorization of face gender by means of a divided visual field paradigm, in which female and male faces were presented unilaterally for 150ms each. A group of 60 healthy participants (30 males) and a male split-brain patient (D.D.C.) were asked to categorize the gender of the stimuli. Healthy participants categorized male faces presented in the right visual field (RVF) better and faster than when presented in the left visual field (LVF), and female faces presented in the LVF than in the RVF, independently of the participants' sex. Surprisingly, the recognition rates of D.D.C. were at chance levels - and significantly lower than those of the healthy participants - for both female and male faces presented in the RVF, as well as for female faces presented in the LVF. His performance was higher than expected by chance - and did not differ from controls - only for male faces presented in the LVF. The residual right-hemispheric ability of the split-brain patient in categorizing male faces reveals an own-gender bias lateralized in the right hemisphere, in line with the rightward own-identity and own-age bias previously shown in split-brain patients. The gender-contingent hemispheric dominance found in healthy participants confirms the previously shown right-hemispheric superiority in recognizing female faces, and also reveals a left-hemispheric superiority in recognizing male faces, adding an important evidence of hemispheric imbalance in the field of face and gender perception.
[Mh] Termos MeSH primário: Encéfalo/fisiologia
Reconhecimento Facial/fisiologia
Lateralidade Funcional/fisiologia
[Mh] Termos MeSH secundário: Adulto
Encéfalo/diagnóstico por imagem
Encéfalo/fisiopatologia
Mapeamento Encefálico
Feminino
Seres Humanos
Julgamento/fisiologia
Masculino
Testes Neuropsicológicos
Transtornos da Percepção/etiologia
Transtornos da Percepção/fisiopatologia
Transtornos da Percepção/psicologia
Caracteres Sexuais
Procedimento de Encéfalo Dividido
Adulto Jovem
[Pt] Tipo de publicação:CASE REPORTS; JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171030
[Lr] Data última revisão:
171030
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161105
[St] Status:MEDLINE


  4 / 37 MEDLINE  
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[PMID]:26426534
[Au] Autor:Turner BO; Marinsek N; Ryhal E; Miller MB
[Ad] Endereço:Department of Psychological & Brain Sciences, University of California Santa Barbara, Santa Barbara, California.
[Ti] Título:Hemispheric lateralization in reasoning.
[So] Source:Ann N Y Acad Sci;1359:47-64, 2015 Nov.
[Is] ISSN:1749-6632
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A growing body of evidence suggests that reasoning in humans relies on a number of related processes whose neural loci are largely lateralized to one hemisphere or the other. A recent review of this evidence concluded that the patterns of lateralization observed are organized according to two complementary tendencies. The left hemisphere attempts to reduce uncertainty by drawing inferences or creating explanations, even at the cost of ignoring conflicting evidence or generating implausible explanations. Conversely, the right hemisphere aims to reduce conflict by rejecting or refining explanations that are no longer tenable in the face of new evidence. In healthy adults, the hemispheres work together to achieve a balance between certainty and consistency, and a wealth of neuropsychological research supports the notion that upsetting this balance results in various failures in reasoning, including delusions. However, support for this model from the neuroimaging literature is mixed. Here, we examine the evidence for this framework from multiple research domains, including an activation likelihood estimation analysis of functional magnetic resonance imaging studies of reasoning. Our results suggest a need to either revise this model as it applies to healthy adults or to develop better tools for assessing lateralization in these individuals.
[Mh] Termos MeSH primário: Cérebro/patologia
Cérebro/fisiologia
Lateralidade Funcional/fisiologia
Funções Verossimilhança
[Mh] Termos MeSH secundário: Mapeamento Encefálico/métodos
Seres Humanos
Esquizofrenia Paranoide/diagnóstico
Esquizofrenia Paranoide/psicologia
Procedimento de Encéfalo Dividido/tendências
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.; REVIEW
[Em] Mês de entrada:1605
[Cu] Atualização por classe:160115
[Lr] Data última revisão:
160115
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151002
[St] Status:MEDLINE
[do] DOI:10.1111/nyas.12940


  5 / 37 MEDLINE  
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[PMID]:26378789
[Au] Autor:Cerullo MA
[Ad] Endereço:Cincinnati Institute for Cognitive Science, Cincinnati, Ohio, United States of America.
[Ti] Título:The Problem with Phi: A Critique of Integrated Information Theory.
[So] Source:PLoS Comput Biol;11(9):e1004286, 2015 Sep.
[Is] ISSN:1553-7358
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Estado de Consciência/fisiologia
Teoria da Informação
Modelos Neurológicos
[Mh] Termos MeSH secundário: Algoritmos
Pesquisa Biomédica
Seres Humanos
Procedimento de Encéfalo Dividido
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1603
[Cu] Atualização por classe:150926
[Lr] Data última revisão:
150926
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150918
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pcbi.1004286


  6 / 37 MEDLINE  
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[PMID]:25575451
[Au] Autor:Prete G; Laeng B; Fabri M; Foschi N; Tommasi L
[Ad] Endereço:Department of Neuroscience, Imaging and Clinical Science, 'G. d'Annunzio' University of Chieti-Pescara, Italy. Electronic address: giulia.prete@unich.it.
[Ti] Título:Right hemisphere or valence hypothesis, or both? The processing of hybrid faces in the intact and callosotomized brain.
[So] Source:Neuropsychologia;68:94-106, 2015 Feb.
[Is] ISSN:1873-3514
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The valence hypothesis and the right hemisphere hypothesis in emotion processing have been alternatively supported. To better disentangle the two accounts, we carried out two studies, presenting healthy participants and an anterior callosotomized patient with 'hybrid faces', stimuli created by superimposing the low spatial frequencies of an emotional face to the high spatial frequencies of the same face in a neutral expression. In both studies we asked participants to judge the friendliness level of stimuli, which is an indirect measure of the processing of emotional information, despite this remaining "invisible". In Experiment 1 we presented hybrid faces in a divided visual field paradigm using different tachistoscopic presentation times; in Experiment 2 we presented hybrid chimeric faces in canonical view and upside-down. In Experiments 3 and 4 we tested a callosotomized patient, with spared splenium, in similar paradigms as those used in Experiments 1 and 2. Results from Experiments 1 and 3 were consistent with the valence hypothesis, whereas results of Experiments 2 and 4 were consistent with the right hemisphere hypothesis. This study confirms that the low spatial frequencies of emotional faces influence the social judgments of observers, even when seen for 28 ms (Experiment 1), possibly by means of configural analysis (Experiment 2). The possible roles of the cortical and subcortical emotional routes in these tasks are discussed in the light of the results obtained in the callosotomized patient. We propose that the right hemisphere and the valence accounts are not mutually exclusive, at least in the case of subliminal emotion processing.
[Mh] Termos MeSH primário: Emoções/fisiologia
Expressão Facial
Lateralidade Funcional/fisiologia
Procedimento de Encéfalo Dividido
[Mh] Termos MeSH secundário: Adulto
Feminino
Seres Humanos
Masculino
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1511
[Cu] Atualização por classe:150211
[Lr] Data última revisão:
150211
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150111
[St] Status:MEDLINE


  7 / 37 MEDLINE  
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[PMID]:25256169
[Au] Autor:Prete G; Fabri M; Foschi N; Brancucci A; Tommasi L
[Ad] Endereço:a Department of Neuroscience and Imaging , 'G. d'Annunzio' University of Chieti-Pescara , Chieti , Italy.
[Ti] Título:The "consonance effect" and the hemispheres: a study on a split-brain patient.
[So] Source:Laterality;20(3):257-69, 2015 May.
[Is] ISSN:1464-0678
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The association between musical consonance and pleasantness, and between musical dissonance and unpleasantness ("consonance effect") is well established. Furthermore, a number of studies suggest the main involvement of the left hemisphere in the perception of dissonance and that of the right hemisphere in the perception of consonance. In the present study, the consonance effect was studied in a callosotomized patient, D. D. C. and in a control group. In binaural presentations, the patient did not attribute different pleasantness judgements to consonant and dissonant chords, differently from the control group who showed the consonance effect. However, in dichotic presentations (e.g. a chord in one ear and white noise in the other ear), a trend towards the consonance effect was found in D. D. C., but only when chords were presented in his right ear (left hemisphere), whereas the control group confirmed the known hemispheric asymmetry in labelling the pleasantness of consonant and dissonant chords. These results suggest that the right-hemispheric superiority in appreciating consonance might hide the inability of the right hemisphere to classify dissonant chords as unpleasant in the split-brain, whereas the left hemisphere seems capable to differently label the pleasantness of consonant and dissonant chords, even if it is more sensitive to dissonance.
[Mh] Termos MeSH primário: Transtornos da Percepção Auditiva/etiologia
Lateralidade Funcional/fisiologia
Complicações Pós-Operatórias/fisiopatologia
Procedimento de Encéfalo Dividido/efeitos adversos
[Mh] Termos MeSH secundário: Estimulação Acústica
Adulto
Análise de Variância
Transtornos da Percepção Auditiva/diagnóstico
Encéfalo/patologia
Testes com Listas de Dissílabos
Epilepsia/patologia
Epilepsia/cirurgia
Seres Humanos
Imagem por Ressonância Magnética
Masculino
Música
[Pt] Tipo de publicação:CASE REPORTS; JOURNAL ARTICLE
[Em] Mês de entrada:1509
[Cu] Atualização por classe:150204
[Lr] Data última revisão:
150204
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140927
[St] Status:MEDLINE
[do] DOI:10.1080/1357650X.2014.959525


  8 / 37 MEDLINE  
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[PMID]:24325712
[Au] Autor:Prete G; D'Ascenzo S; Laeng B; Fabri M; Foschi N; Tommasi L
[Ad] Endereço:Department of Neuroscience and Imaging, 'G. d'Annunzio' University of Chieti-Pescara, Italy.
[Ti] Título:Conscious and unconscious processing of facial expressions: evidence from two split-brain patients.
[So] Source:J Neuropsychol;9(1):45-63, 2015 Mar.
[Is] ISSN:1748-6653
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:We investigated how the brain's hemispheres process explicit and implicit facial expressions in two 'split-brain' patients (one with a complete and one with a partial anterior resection). Photographs of faces expressing positive, negative or neutral emotions were shown either centrally or bilaterally. The task consisted in judging the friendliness of each person in the photographs. Half of the photograph stimuli were 'hybrid faces', that is an amalgamation of filtered images which contained emotional information only in the low range of spatial frequency, blended to a neutral expression of the same individual in the rest of the spatial frequencies. The other half of the images contained unfiltered faces. With the hybrid faces the patients and a matched control group were more influenced in their social judgements by the emotional expression of the face shown in the left visual field (LVF). When the expressions were shown explicitly, that is without filtering, the control group and the partially callosotomized patient based their judgement on the face shown in the LVF, whereas the complete split-brain patient based his ratings mainly on the face presented in the right visual field. We conclude that the processing of implicit emotions does not require the integrity of callosal fibres and can take place within subcortical routes lateralized in the right hemisphere.
[Mh] Termos MeSH primário: Estado de Consciência/fisiologia
Expressão Facial
Reconhecimento Visual de Modelos/fisiologia
Procedimento de Encéfalo Dividido/efeitos adversos
Inconsciente (Psicologia)
[Mh] Termos MeSH secundário: Adulto
Análise de Variância
Seres Humanos
Masculino
Meia-Idade
Estimulação Luminosa
Fatores de Tempo
[Pt] Tipo de publicação:CASE REPORTS; JOURNAL ARTICLE
[Em] Mês de entrada:1511
[Cu] Atualização por classe:150302
[Lr] Data última revisão:
150302
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:131212
[St] Status:MEDLINE
[do] DOI:10.1111/jnp.12034


  9 / 37 MEDLINE  
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[PMID]:24971689
[Au] Autor:Prete G; Marzoli D; Brancucci A; Fabri M; Foschi N; Tommasi L
[Ad] Endereço:Department of Neuroscience and Imaging, 'G. d'Annunzio' University of Chieti-Pescara, Chieti, Italy. Electronic address: giulia.prete@unich.it.
[Ti] Título:The processing of chimeric and dichotic emotional stimuli by connected and disconnected cerebral hemispheres.
[So] Source:Behav Brain Res;271:354-64, 2014 Sep 01.
[Is] ISSN:1872-7549
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Hemispheric asymmetries have been widely explored in both the visual and the auditory domain, but little is known about hemispheric asymmetries in audio-visual integration. We compared the performance of a partially callosotomized patient, a total split-brain patient and a control group during the evaluation of the emotional valence of chimeric faces and dichotic syllables (an emotional syllable in one ear and white noise in the other ear) presented unimodally (only faces or only syllables) or bimodally (faces and syllables presented simultaneously). Stimuli could convey happy and sad expressions and participants were asked to evaluate the emotional content of each presentation, using a 5-point Likert scale (from very sad to very happy). In unimodal presentations, the partially callosotomized patient's judgments depended on the emotional valence of the stimuli processed by the right hemisphere, whereas those of the total split-brain patient showed the opposite lateralization; in these conditions, the control group did not show asymmetries. Moreover, in bimodal presentations, results provided support for the valence hypothesis (i.e., left asymmetry for positive emotions and vice versa) in both the control group and the partially callosotomized patient, whereas the total split-brain patient showed a tendency to evaluate the emotional content of the right hemiface even when asked to focus on the acoustic modality. We conclude that partial and total hemispheric disconnections reveal opposite patterns of hemispheric asymmetry in auditory, visual and audio-visual emotion processing. These results are discussed in the light of the right-hemisphere hypothesis and the valence hypothesis.
[Mh] Termos MeSH primário: Percepção Auditiva
Cérebro/fisiologia
Emoções
Lateralidade Funcional/fisiologia
Procedimento de Encéfalo Dividido
Percepção Visual
[Mh] Termos MeSH secundário: Adulto
Expressão Facial
Feminino
Felicidade
Seres Humanos
Masculino
Meia-Idade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1508
[Cu] Atualização por classe:140721
[Lr] Data última revisão:
140721
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140628
[St] Status:MEDLINE


  10 / 37 MEDLINE  
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[PMID]:24448186
[Au] Autor:Kucukyuruk B; Yagmurlu K; Tanriover N; Uzan M; Rhoton AL
[Ad] Endereço:*Department of Neurosurgery, University of Florida, Gainesville, Florida; ‡Department of Neurosurgery, Istanbul University, Cerrahpasa Medical Faculty, Istanbul, Turkey.
[Ti] Título:Microsurgical anatomy of the white matter tracts in hemispherotomy.
[So] Source:Neurosurgery;10 Suppl 2:305-24; discussion 324, 2014 Jun.
[Is] ISSN:1524-4040
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Hemispherotomy is a surgical procedure performed for refractory epileptic seizures due to wide hemispheric damage. OBJECTIVE: To describe the microanatomy of the white matter tracts transected in a hemispherotomy and the relationship of the surgical landmarks used during the intraventricular callosotomy. METHODS: The cortical and subcortical structures were examined in 32 hemispheres. RESULTS: Incision of the temporal stem along the inferior limiting sulcus crosses the insulo-opercular fibers, uncinate, inferior occipitofrontal and middle longitudinal fasciculi, anterior commissure, and optic and auditory radiations. The incision along the superior limiting sulcus transects insulo-opercular fibers and the genu and posterior limb of internal capsule. The incision along the anterior limiting sulcus crosses the insulo-opercular fibers, anterior limb of the internal capsule, anterior commissure, and the anterior thalamic bundle. The disconnection of the posterior part of the corpus callosum may be incomplete if the point at which the last cortical branch of the anterior cerebral artery (ACA) turns upward and disappears from the view through the intraventricular exposure is used as the landmark for estimating the posterior extent of the callosotomy. This ACA branch turns upward before reaching the posterior edge of the splenium in 85% of hemispheres. The falx, followed to the posterior edge of the splenium, is a more reliable landmark for completing the posterior part of an intraventricular callosotomy. CONCLUSION: The fiber tracts disconnected in hemispherotomy were reviewed. The falx is a more reliable guide than the ACA in completing the posterior part of the intraventricular callosotomy.
[Mh] Termos MeSH primário: Córtex Cerebral/anatomia & histologia
Corpo Caloso/anatomia & histologia
Procedimento de Encéfalo Dividido/métodos
Substância Branca/anatomia & histologia
[Mh] Termos MeSH secundário: Adulto
Cadáver
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1501
[Cu] Atualização por classe:140522
[Lr] Data última revisão:
140522
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140123
[St] Status:MEDLINE
[do] DOI:10.1227/NEU.0000000000000288



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