[Eeglablist] Fwd: Study Epoch consistency with single epoch

[Makoto Miyakoshi]

Dear David,

> My question is why?

Good point. It's a limitation. If there are specific analysis you can't do
due to this limitation, you may call it a bug. However, there is an
alternative way to do it, so I would not call it a bug.

> I tried to make single epochs “seem” the same in the STUDY structure by
copying and formatting the ALLEEG.event information over to the
ALLEEG.epoch.

If I understand your point correctly...
If you have a single-epoch data, it is called a continuous data. I imagine
you have single trial data of condition A, B, C, etc. and want to make a
comparison across them on STUDY? Then I recommend you test them as
condition-separated continuous data. That way the process could be simpler.

Makoto

On Tue, Jan 29, 2019 at 12:21 PM David Ryan <ryand1 at goldmail.etsu.edu>
wrote:

> Hello,
>
> In my study I have several conditions (A, B,C…) and the epochs get
> organized into categories based on response (e.g., Condition A-Correct,
> Condition A-Incorrect, Condition B-Correct, Condition B-Incorrect, and so
> on…). This results with several single response epochs for certain
> categories. When I load this into STUDY it says “Epoch Consistency = no”
> and leads to matrix dimension errors for the ERSP.
>
>
>
> I have read through the Eeglablist and have found were several people want
> to analyze a single epoch as an epoch, not as continuous EEG - the EEGLAB
> default. The consistent response I have read is “ If there is one epoch, it
> cannot be recognized as epoched”. My question is why?
>
>
>
> How does a single epoch from a single subject in a condition with other
> multiple epochs from other subjects, all with the same epoch length not
> meet the criteria of epoch consistency? I know that EEGLAB reads a single
> epoch as continuous, but is there no way to change/override this assumption?
>
>
>
> In my own naïve attempt to address this issue, I tried to make single
> epochs “seem” the same in the STUDY structure by copying and formatting the
> ALLEEG.event information over to the ALLEEG.epoch. This still leaves the
> issue of the ALLEEG.trials =1.
>
>
>
> Any more ideas to address this issue?
>
>
>
> Thanks,
>
> Dave
>
>
>
>
>
>
>
> David Ryan, Ph.D.
>
> Research Health Science Specialist
>
> Hearing & Balance Research Program
>
> James H. Quillen VAMC (621)
>
> Research Service (151)
>
> Mountain Home, TN 37684
>
> (423)-926-1171 Ext. 7575
>
> [image: HBRH]
>
>
> --
>
> David Ryan, Ph.D.
>
> Research Health Specialist
>
> Mountain Home VA Health Care System (621)
>
> Auditory Vestibular Research Enhancement Award Program (REAP)
>
> Research Service
>
> (423)-926-1171 Ext. 7575
>
> www.avreap.research.va.gov
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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