SVD single voxel analysis Frank Leone, Ivan Toni, Pieter Medendorp.
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Transcript of SVD single voxel analysis Frank Leone, Ivan Toni, Pieter Medendorp.
![Page 1: SVD single voxel analysis Frank Leone, Ivan Toni, Pieter Medendorp.](https://reader035.fdocuments.in/reader035/viewer/2022062620/551a6ef055034643688b5000/html5/thumbnails/1.jpg)
SVD single voxel analysisFrank Leone, Ivan Toni, Pieter Medendorp
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Location = direction * amplitude?
vs
![Page 5: SVD single voxel analysis Frank Leone, Ivan Toni, Pieter Medendorp.](https://reader035.fdocuments.in/reader035/viewer/2022062620/551a6ef055034643688b5000/html5/thumbnails/5.jpg)
Singular value decomposition
![Page 6: SVD single voxel analysis Frank Leone, Ivan Toni, Pieter Medendorp.](https://reader035.fdocuments.in/reader035/viewer/2022062620/551a6ef055034643688b5000/html5/thumbnails/6.jpg)
Previous work: Location = X * Y (auditory domain)
Pena & Konishi, 2001
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Previous work: Eye vs Hand relative tuning
Pesaran et al, 2006
![Page 8: SVD single voxel analysis Frank Leone, Ivan Toni, Pieter Medendorp.](https://reader035.fdocuments.in/reader035/viewer/2022062620/551a6ef055034643688b5000/html5/thumbnails/8.jpg)
Previous work: Eye vs Hand relative tuning
Pesaran et al, 2006
![Page 9: SVD single voxel analysis Frank Leone, Ivan Toni, Pieter Medendorp.](https://reader035.fdocuments.in/reader035/viewer/2022062620/551a6ef055034643688b5000/html5/thumbnails/9.jpg)
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Closer inspection of fields
Roughly Gaussian
Correlation preferred amplitude and field width (?, in progress)
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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?
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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