Factors modulating neural processing time measured using fMRI

• Processo: 12/50722-0
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Vigência: 01 de outubro de 2012 - 30 de setembro de 2014
• Área do conhecimento: Ciências da Saúde - Medicina - Radiologia Médica
• Convênio/Acordo: King's College London
• Pesquisador responsável: Edson Amaro Junior
• Beneficiário: Edson Amaro Junior
• Pesq. responsável no exterior: Thomas White
• Instituição no exterior: King's College London, Inglaterra
• Instituição Sede: Faculdade de Medicina (FM). Universidade de São Paulo (USP). São Paulo , SP, Brasil
• Vinculado ao auxílio: 09/53443-1 - Neuroimunologia, genômica funcional e neuroimagem: uma abordagem integrada no estudo da fisiopatologia e tratamento da epilepsia refratária, AP.TEM
• Assunto(s): Imagem por ressonância magnética funcional Técnicas de diagnóstico neurológico Esquizofrenia Anfetamina
• Palavra(s)-Chave do Pesquisador: Amphetamine | Cortical Efficiency | Eeg Fmri | Fmri | Neural Processing Time | Schizophrenia

Resumo

Morphometric features of the hemodynamic response function (HRF) potentially provide a window on to alternative characteristics of neuronal activity using fMRI. Recently, neural processing time (NPT) - the period for which event-related neuonal activity occurs - was proposed as a measurable feature of the biophysical model of HRF. However, systematic investigation of the factors modulating NPT has not yet been conducted but could potentially mark a significant improvement of our understanding of the neural conditions characteristic of efficient information processing. Accordingly, we propose a collaborative study which will adapt NPT inference, developed at USP, to test four principal hypotheses on N-back data previously collected at KCL: (i) that NPT in decision-making regions will be modulated by working memory load, being shorter in low memory-load conditions; (ii) that individuals with psychosis will exhibit aberrant NPT on account of diminished cortical efficiency, with psychosis-related differences moderated by symptom profile; (iii) that this aberrance will be mirrored by healthy individuals following amphetamine sensitisation; and (iv) that simultaneously acquired electroencephalography (EEG)-fMRI data collected during working memory performance will provide a means of further validating NPT by permitting the assessment of the relationship between neuroelectric components (from EEG) and fMRI NPT measures. (AU)

Publicações científicas

(Referências obtidas automaticamente do Web of Science e do SciELO, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores)

HOEXTER, MARCELO Q.; BIAZOLI, JR., CLAUDINEI E.; ALVARENGA, PEDRO G.; BATISTUZZO, MARCELO C.; SALUM, GIOVANNI A.; GADELHA, ARY; PAN, PEDRO M.; ANES, MAURICIO; MANCINI-MARTINS, LETICIA; MOURA, LUCIANA M.; et al. Low frequency fluctuation of brain spontaneous activity and obsessive compulsive symptoms in a large school-age sample. JOURNAL OF PSYCHIATRIC RESEARCH, v. 96, p. 224-230, JAN 2018. (13/08531-5, 08/57896-8, 13/00506-1, 16/05865-8, 16/02246-5, 12/50722-0, 13/10498-6)