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• W2995641986 abstract "Abstract The trial-to-trial response variability in sensory cortices and the extent to which this variability can be coordinated among cortical units have strong implications for cortical signal processing. Yet, little is known about the relative contributions and dynamics of defined sources to the cortical response variability and their correlations across cortical units. To fill this knowledge gap, here we obtained and analyzed multisite local field potential (LFP) recordings from visual cortex of turtles in response to repeated naturalistic movie clips and decomposed cortical across-trial LFP response variability into three defined sources, namely, input, network, and local fluctuations. We found that input fluctuations dominate cortical response variability immediately following stimulus onset, whereas network fluctuations dominate the response variability in the steady state during continued visual stimulation. Concurrently, we found that the network fluctuations dominate the correlations of the variability during the ongoing and steady-state epochs, but not immediately following stimulus onset. Furthermore, simulations of various model networks indicated that (i) synaptic time constants, leading to oscillatory activity, and (ii) synaptic clustering and synaptic depression, leading to spatially constrained pockets of coherent activity, are both essential features of cortical circuits to mediate the observed relative contributions and dynamics of input, network, and local fluctuations to the cortical LFP response variability and their correlations across recording sites. In conclusion, these results show how a mélange of multiscale thalamocortical circuit features mediate a complex stimulus-modulated cortical activity that, when naively related to the visual stimulus alone, appears disguised as high and coordinated across-trial response variability." @default.
• W2995641986 created "2019-12-26" @default.
• W2995641986 creator A5009715973 @default.
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• W2995641986 date "2019-01-01" @default.
• W2995641986 modified "2023-10-16" @default.
• W2995641986 title "Dynamics and sources of response variability and its coordination in visual cortex" @default.
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• W2995641986 doi "https://doi.org/10.1017/s0952523819000117" @default.
• W2995641986 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31840629" @default.
• W2995641986 hasPublicationYear "2019" @default.
• W2995641986 type Work @default.
• W2995641986 sameAs 2995641986 @default.

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