[Eeglablist] Empty Scalp Topography file in pre-clustering array

[Makoto Miyakoshi]

Dear Josh,

Sorry to hear the problem.

> I have tried building a pre-clustering array in STUDY and i get the error
'empty scalp topography file - also necessary for ERP polarity Try
recomputing scalp topographies for components'

When (i.e. after what process) did you exactly get this message?

> I can see that each dataset has a .icatopo associated with it in the same
directory as the .sets, but some are only 3 KB in size (the rest being
around 1800).

Scalp maps could be small in data size.

> What has happened here? must i manually save scalp topo files for
component?

No, definitely not.

> i was under the impression that they were automatically generated when
running ICA?

It does require precompute. Did you check the checkbox if you ever have
precomputed them? You can precompute scalp topos separately from other
measures.

Makoto

On Wed, Dec 10, 2014 at 2:37 AM, Baker, Joshua <joshua.baker at ntu.ac.uk>
wrote:
>
> Hi all,
>
> I have tried building a pre-clustering array in STUDY and i get the error
> 'empty scalp topography file - also necessary for ERP polarity Try
> recomputing scalp topographies for components' - I can see that each
> dataset has a .icatopo associated with it in the same directory as the
> .sets, but some are only 3 KB in size (the rest being around 1800). What
> has happened here? must i manually save scalp topo files for component? i
> was under the impression that they were automatically generated when
> running ICA?
>
> Many thanks for your help.
>
> Josh
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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