User Activity

  • Posted a comment on discussion Help on ERP PCA Toolkit

    another thought. look to see if it has the same topography as another factor with a modestly different latency. if so it might be a latency shift factor, accounting for the difference in timing. The Topos View function is good for this sort of comparison.

  • Posted a comment on discussion Help on ERP PCA Toolkit

    I'm still not really clear what I am looking at but I can say that the factors will not necessarily map clearly onto peaks. It is one of the things that PCA does for you is to bring out non-obvious features. Also, the factor is quite small compared to the waveforms so I'm not clear it's even worth looking at.

  • Posted a comment on discussion Help on ERP PCA Toolkit

    Could you send me screenshots so I can get a clearer sense of what you are looking at? Also, you might be interested in comparing your results with my 1997 PCA findings: Dien, J., Tucker, D. M., Potts, G., & Hartry, A. (1997). Localization of auditory evoked potentials related to selective intermodal attention. Journal of Cognitive Neuroscience, 9(6), 799-823. Joe

  • Posted a comment on discussion Help on ERP PCA Toolkit

    To give you some guidance on what you want to look for as you verify your PCA solutions,...

  • Posted a comment on discussion Help on ERP PCA Toolkit

    Hi Ana, thanks for your kind words! It's defiitely a good idea to be thinking about...

  • Posted a comment on discussion Help on ERP PCA Toolkit

    Ah, I see what the issue is now! So what you need to know is that despite our naming...

  • Posted a comment on discussion Help on ERP PCA Toolkit

    It occurs to me there might have been a bug I fixed in the Edit function. I'll send...

  • Posted a comment on discussion Help on ERP PCA Toolkit

    Hi, I'll need more information. You can get different results from Edit and Topos...

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jdien
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2005-10-18 21:25:40

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