Empirische Inferenz Poster 2008

Analysis of Pattern Recognition Methods in Classifying Bold Signals in Monkeys at 7-Tesla

Pattern recognition methods have shown that fMRI data can reveal significant information about brain activity. For example, in the debate of how object-categories are represented in the brain, multivariate analysis has been used to provide evidence of distributed encoding schemes. Many follow-up studies have employed different methods to analyze human fMRI data with varying degrees of success. In this study we compare four popular pattern recognition methods: correlation analysis, support-vector machines (SVM), linear discriminant analysis and Gaussian naïve Bayes (GNB), using data collected at high field (7T) with higher resolution than usual fMRI studies. We investigate prediction performance on single trials and for averages across varying numbers of stimulus presentations. The performance of the various algorithms depends on the nature of the brain activity being categorized: for several tasks, many of the methods work well, whereas for others, no methods perform above chance level. An important factor in overall classification performance is careful preprocessing of the data, including dimensionality reduction, voxel selection, and outlier elimination.

Author(s): Ku, S-P. and Gretton, A. and Macke, J. and Tolias, AT. and Logothetis, NK.
Journal: AREADNE 2008: Research in Encoding and Decoding of Neural Ensembles
Volume: 2
Pages: 67
Year: 2008
Month: June
Day: 0
Bibtex Type: Poster (poster)
Digital: 0
Electronic Archiving: grant_archive
Language: en
Organization: Max-Planck-Gesellschaft
School: Biologische Kybernetik

BibTex

@poster{5857,
  title = {Analysis of Pattern Recognition Methods in Classifying Bold Signals in Monkeys at 7-Tesla},
  journal = {AREADNE 2008: Research in Encoding and Decoding of Neural Ensembles},
  abstract = {Pattern recognition methods have shown that fMRI data can reveal significant information
  about brain activity. For example, in the debate of how object-categories are represented in
  the brain, multivariate analysis has been used to provide evidence of distributed encoding
  schemes. Many follow-up studies have employed different methods to analyze human fMRI
  data with varying degrees of success. In this study we compare four popular pattern recognition
  methods: correlation analysis, support-vector machines (SVM), linear discriminant analysis
  and Gaussian naïve Bayes (GNB), using data collected at high field (7T) with higher resolution
  than usual fMRI studies. We investigate prediction performance on single trials and for averages
  across varying numbers of stimulus presentations. The performance of the various algorithms
  depends on the nature of the brain activity being categorized: for several tasks,
  many of the methods work well, whereas for others, no methods perform above chance level.
  An important factor in overall classification performance is careful preprocessing of the data,
  including dimensionality reduction, voxel selection, and outlier elimination.},
  volume = {2},
  pages = {67},
  organization = {Max-Planck-Gesellschaft},
  school = {Biologische Kybernetik},
  month = jun,
  year = {2008},
  slug = {5857},
  author = {Ku, S-P. and Gretton, A. and Macke, J. and Tolias, AT. and Logothetis, NK.},
  month_numeric = {6}
}