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Modeling the evolution of dynamic brain processes during an associative learning experiment
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Fiecas, Mark and Ombao, Hernando (2016) Modeling the evolution of dynamic brain processes during an associative learning experiment. Journal of the American Statistical Association, 111 (516). pp. 1440-1453. doi:10.1080/01621459.2016.1165683 ISSN 0162-1459.
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Official URL: http://dx.doi.org/10.1080/01621459.2016.1165683
Abstract
We develop a new time series model to investigate the dynamic interactions between the nucleus accumbens and the hippocampus during an associative learning experiment. Preliminary analyses indicated that the spectral properties of the local field potentials at these two regions changed over the trials of the experiment. While many models already take into account nonstationarity within a single trial, the evolution of the dynamics across trials is often ignored. Our proposed model, the slowly evolving locally stationary process (SEv-LSP), is designed to capture nonstationarity both within a trial and across trials. We rigorously define the evolving evolutionary spectral density matrix, which we estimate using a two-stage procedure. In the first stage, we compute the within-trial time-localized periodogram matrix. In the second stage, we develop a data-driven approach that combines information from trial-specific local periodogram matrices. Through simulation studies, we show the utility of our proposed method for analyzing time series data with different evolutionary structures. Finally, we use the SEv-LSP model to demonstrate the evolving dynamics between the hippocampus and the nucleus accumbens during an associative learning experiment.
Item Type: | Journal Article | ||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Statistics | ||||||||||
Journal or Publication Title: | Journal of the American Statistical Association | ||||||||||
Publisher: | American Statistical Association | ||||||||||
ISSN: | 0162-1459 | ||||||||||
Official Date: | 2016 | ||||||||||
Dates: |
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Volume: | 111 | ||||||||||
Number: | 516 | ||||||||||
Page Range: | pp. 1440-1453 | ||||||||||
DOI: | 10.1080/01621459.2016.1165683 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access |
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