[Eeglablist] Fwd: A problem of empty scalp topography

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Thu Feb 27 22:02:19 PST 2014

Dear San-Yuan,

Sorry to hear the trouble.
This is just my guess though but you probably need to delete all precomute
files in your folder (.icaerp etc). Definitely you don't need to re-run ICA.


2014-02-21 16:50 GMT-08:00 San-Yuan Lin <lin.sanyuan at gmail.com>:

> Hi,
> I tried and succeeded to build pre-cluster array and cluster the
> signal using ERPs, spectrum, ERSP, ITC, and scalp map once. Then I
> changed my mind with a specific design that I derived the cluster with
> so I modified the design.
> After that, I was getting the message 'empty scalp topography' and was
> suggested to recompute it. So I went to Study>Precompute component
> measures to select the option scalp only. But even after that, I still
> can not build a pre-cluster array with the option of scalp map. A
> screen shot is as flows: http://tinyurl.com/mh3ukyf
> Does anybody know what happened? Now I am trying to recompute ICA.
> Also, Is the icatopo file computed result in one large file (~1.8Mb)
> for each subject and then in subsequent condition for the same subject
> the same file is applied so the other files are small (~3kb)?
> Best,
> Sanyuan
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Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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