Int J Neural Syst - Perceptual suppression revealed by adaptive multi-scale entropy analysis of local field potential in monkey visual cortex.

Tópicos

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Resumo

Generalized flash suppression (GFS), in which a salient visual stimulus can be rendered invisible despite continuous retinal input, provides a rare opportunity to directly study the neural mechanism of visual perception. Previous work based on linear methods, such as spectral analysis, on local field potential (LFP) during GFS has shown that the LFP power at distinctive frequency bands are differentially modulated by perceptual suppression. Yet, the linear method alone may be insufficient for the full assessment of neural dynamic due to the fundamentally nonlinear nature of neural signals. In this study, we set forth to analyze the LFP data collected from multiple visual areas in V1, V2 and V4 of macaque monkeys while performing the GFS task using a nonlinear method - adaptive multi-scale entropy (AME) - to reveal the neural dynamic of perceptual suppression. In addition, we propose a new cross-entropy measure at multiple scales, namely adaptive multi-scale cross-entropy (AMCE), to assess the nonlinear functional connectivity between two cortical areas. We show that: (1) multi-scale entropy exhibits percept-related changes in all three areas, with higher entropy observed during perceptual suppression; (2) the magnitude of the perception-related entropy changes increases systematically over successive hierarchical stages (i.e. from lower areas V1 to V2, up to higher area V4); and (3) cross-entropy between any two cortical areas reveals higher degree of asynchrony or dissimilarity during perceptual suppression, indicating a decreased functional connectivity between cortical areas. These results, taken together, suggest that perceptual suppression is related to a reduced functional connectivity and increased uncertainty of neural responses, and the modulation of perceptual suppression is more effective at higher visual cortical areas. AME is demonstrated to be a useful technique in revealing the underlying dynamic of nonlinear/nonstationary neural signal.

Resumo Limpo

general flash suppress gfs salient visual stimulus can render invis despit continu retin input provid rare opportun direct studi neural mechan visual percept previous work base linear method spectral analysi local field potenti lfp gfs shown lfp power distinct frequenc band differenti modul perceptu suppress yet linear method alon may insuffici full assess neural dynam due fundament nonlinear natur neural signal studi set forth analyz lfp data collect multipl visual area v v v macaqu monkey perform gfs task use nonlinear method adapt multiscal entropi ame reveal neural dynam perceptu suppress addit propos new crossentropi measur multipl scale name adapt multiscal crossentropi amc assess nonlinear function connect two cortic area show multiscal entropi exhibit perceptrel chang three area higher entropi observ perceptu suppress magnitud perceptionrel entropi chang increas systemat success hierarch stage ie lower area v v higher area v crossentropi two cortic area reveal higher degre asynchroni dissimilar perceptu suppress indic decreas function connect cortic area result taken togeth suggest perceptu suppress relat reduc function connect increas uncertainti neural respons modul perceptu suppress effect higher visual cortic area ame demonstr use techniqu reveal under dynam nonlinearnonstationari neural signal

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