Abstract :
[en] The brain is organized hierarchically to process sensory signals. But, how do functional connections within and across areas contribute to this hierarchical order? We addressed this problem in the thalamocortical network, while monkeys detected vibrotactile stimulus. During this task, we quantified neural variability and directed functional connectivity in simultaneously recorded neurons sharing the cutaneous receptive field within and across VPL and areas 3b and 1. Before stimulus onset, VPL and area 3b exhibited similar fast dynamics while area 1 showed slower timescales. During the stimulus presence, inter-trial neural variability increased along the network VPL-3b-1 while VPL established two main feedforward pathways with areas 3b and 1 to process the stimulus. This lower variability of VPL and area 3b was found to regulate feedforward thalamocortical pathways. Instead, intra-cortical interactions were only anticipated by higher intrinsic timescales in area 1. Overall, our results provide evidence of hierarchical functional roles along the thalamocortical network.
Funders :
UNAM - Universidad Nacional Autónoma de México
Bial Foundation
MICINN - Ministerio de Ciencia, Innovación y Universidades
CONACYT - Consejo Nacional de Ciencia y Tecnología
IBRO - International Brain Research Organization
Funding text :
A.T.C. was supported by the Spanish national research project (ref. PID2020-119072RA-I00/AEI/10.13039/501100011033 ) funded by the Spanish Ministry of Science, Innovation, and Universities ( MCIU ) and the Bial Foundation grant 106/18 . G.D. was supported by the Spanish national research project (ref. PID2019-105772GB-I00/AEI/10.13039/501100011033 ) funded by the Spanish Ministry of Science, Innovation, and Universities ( MCIU ). This work was supported by grants PAPIITIN205022 from the Direcci\u00F3n de Asuntos del Personal Acad\u00E9mico de la Universidad Nacional Aut\u00F3noma de M\u00E9xico (to R.R.-P.); CONAHCYT-319347 (to R.R.P.) from Consejo Nacional de Ciencia y Tecnolog\u00EDa ; and IBRO Early Career Award 2022 (to R.R.-P.) from International Brain Research Association.A.T.C. was supported by the Spanish national research project (ref. PID2020-119072RA-I00/AEI/10.13039/501100011033) funded by the Spanish Ministry of Science, Innovation, and Universities (MCIU) and the Bial Foundation grant 106/18. G.D. was supported by the Spanish national research project (ref. PID2019-105772GB-I00/AEI/10.13039/501100011033) funded by the Spanish Ministry of Science, Innovation, and Universities (MCIU). This work was supported by grants PAPIITIN205022 from the Direcci\u00F3n de Asuntos del Personal Acad\u00E9mico de la Universidad Nacional Aut\u00F3noma de M\u00E9xico (to R.R.-P.); CONAHCYT-319347 (to R.R.P.) from Consejo Nacional de Ciencia y Tecnolog\u00EDa; and IBRO Early Career Award 2022 (to R.R.-P.) from International Brain Research Association. R.R. directed the experiments; A.Z. Y.V. M.A. H.D. and R.R. were responsible for the neural recordings and animal training; R.R. R.R.-P. A.T.C. and G.D. designed study and provided financial support; A.T.C. R.A.S. R.R.-P. and S.P. were responsible for the data analysis and wrote manuscript. All authors have no relevant financial or non-financial interests to disclose.
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