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

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Presentation transcript:

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

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

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

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

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?

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