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SVD single voxel analysis

Frank Leone, Ivan Toni, Pieter Medendorp. SVD single voxel analysis. Location = direction * amplitude?. vs. Singular value decomposition. Previous work: Location = X * Y (auditory domain). Pena & Konishi , 2001. Previous work: Eye vs Hand relative tuning. Pesaran et al, 2006.

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SVD single voxel analysis

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  1. Frank Leone, Ivan Toni, Pieter Medendorp SVD single voxel analysis

  2. Location = direction * amplitude? vs

  3. Singular value decomposition

  4. Previous work: Location = X * Y (auditory domain) Pena & Konishi, 2001

  5. Previous work: Eye vs Hand relative tuning Pesaran et al, 2006

  6. Previous work: Eye vs Hand relative tuning Pesaran et al, 2006

  7. Closer inspection of fields • Roughly Gaussian • Correlation preferred amplitude and field width(?, in progress)

  8. Extensions / applications • Test different representations: • X – Y • Multiplication vs addition • Test separability in general, of any two multivalue effects • More general: fit functions through your single voxel t-values, instead of making simple contrasts • T values or beta’s?

  9. Conclusion There is more than meets in the eye in single voxels Can fit functions to your t-values Can use SVD to test separability

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