Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Estimating Learning Effects: A Short-Time Fourier Transform Regression
  Model for MEG Source Localization   Magnetoencephalography (MEG) has a high temporal resolution well-suited for
studying perceptual learning. However, to identify where learning happens in
the brain, one needs to ap- ply source localization techniques to project MEG
sensor data into brain space. Previous source localization methods, such as the
short-time Fourier transform (STFT) method by Gramfort et al.([Gramfort et al.,
2013]) produced intriguing results, but they were not designed to incor- porate
trial-by-trial learning effects. Here we modify the approach in [Gramfort et
al., 2013] to produce an STFT-based source localization method (STFT-R) that
includes an additional regression of the STFT components on covariates such as
the behavioral learning curve. We also exploit a hierarchical L 21 penalty to
induce structured sparsity of STFT components and to emphasize signals from
regions of interest (ROIs) that are selected according to prior knowl- edge. In
reconstructing the ROI source signals from simulated data, STFT-R achieved
smaller errors than a two-step method using the popular minimum-norm estimate
(MNE), and in a real-world human learning experiment, STFT-R yielded more
interpretable results about what time-frequency components of the ROI signals
were correlated with learning.

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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph