[FieldTrip] BEMCP

[RICHARDS, JOHN]

"The correlation between concentric spheres and FEM (attached) it is not so bad” .  I am not sure what you are correlating.  Is this over the time of a beamformer model, or over participants with a single-time model?  In either case, I think the correlations for the FEM-Concentric spheres are bad, many are less < 0.8, and a number are in the range from .9 to .95.

This result confirms the difference in the FEM and concentric-sphere models.  These are exacerbated even further when you use a subject-specific realistic FEM model and a concentric spheres model.

The results between the BEMCP and concentric spheres suggests that the BEMCP model is not working.  Most of the correlations should be positive.  I have not used correlations as you have, but have done ROIs in an individual, and correlated the values of the ROIs over the head for one subject, or multiple subjects.  I find higher correlations for the BEMCP and Concentric sphere models, than between either of these  and a FEM model.  However, in my case I am not using the standard model from FT, but using subject-specific BEMCP, concentric spheres, and FEM models.

If the FEM model is working for you, why not use it?

John

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John E. Richards Carolina Distinguished Professor
Department of Psychology
University of South Carolina
Columbia, SC  29208
Dept Phone: 803 777 2079
Fax: 803 777 9558
Email: richards-john at sc.edu<mailto:richards-john at sc.edu>
HTTP: jerlab.psych.sc.edu
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