[Eeglablist] simple question about epoch and event

[Stephen Politzer-Ahles]

Hi Min,

This depends on some options that you select while epoching. For example,
it's possible that EEGLAB may not have made two epochs out of two identical
events that are close together (there is an option for that) or events
occurring very early or late in the recording (there are also options for
that). It would be helpful if you could provide more information about the
commands that you called for epoching.

best,
Steve



Stephen Politzer-Ahles
New York University, Abu Dhabi
Neuroscience of Language Lab
http://www.nyu.edu/projects/politzer-ahles/


On Sat, Oct 26, 2013 at 12:53 AM, Min Sheng <Min.Sheng at utsouthwestern.edu>wrote:

>  Dear all,
>
> I am new to EEG process, I am a little confused about the epoch and the
> event. When I use eeglab to extract epochs from raw data, I thought the
> number of   event and the epoch should be the same, but it didn't. For
> example,  if I extracted 'S32' epochs and generated new data set, it showed
> that the number of epochs is 755 while the number of events is 758.
> However, the VMRK file shows the number of 'S32' should be 756. It happened
> when there were some  other markers mixed (like 'buffer overflow') during
> the recording.
>
>
>
> Best regards,
>
> Min sheng
>
>
>
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>
> UT Southwestern Medical Center
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