Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling the Sequence of Brain Volumes by Local Mesh Models for Brain
  Decoding   We represent the sequence of fMRI (Functional Magnetic Resonance Imaging)
brain volumes recorded during a cognitive stimulus by a graph which consists of
a set of local meshes. The corresponding cognitive process, encoded in the
brain, is then represented by these meshes each of which is estimated assuming
a linear relationship among the voxel time series in a predefined locality.
First, we define the concept of locality in two neighborhood systems, namely,
the spatial and functional neighborhoods. Then, we construct spatially and
functionally local meshes around each voxel, called seed voxel, by connecting
it either to its spatial or functional p-nearest neighbors. The mesh formed
around a voxel is a directed sub-graph with a star topology, where the
direction of the edges is taken towards the seed voxel at the center of the
mesh. We represent the time series recorded at each seed voxel in terms of
linear combination of the time series of its p-nearest neighbors in the mesh.
The relationships between a seed voxel and its neighbors are represented by the
edge weights of each mesh, and are estimated by solving a linear regression
equation. The estimated mesh edge weights lead to a better representation of
information in the brain for encoding and decoding of the cognitive tasks. We
test our model on a visual object recognition and emotional memory retrieval
experiments using Support Vector Machines that are trained using the mesh edge
weights as features. In the experimental analysis, we observe that the edge
weights of the spatial and functional meshes perform better than the
state-of-the-art brain decoding models.

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The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ