[Eeglablist] Gratton ocular correction issue

[Thang Le]

Thanks, Scott. Do you know these methods can be used on data with a low
high pass filter? The reason why I wanted to use Gratton was because I've
applied a high pass filter of 0.1Hz, which seems to be too low for ICA.
>From what I understand Gratton is not sensitive to such a low high pass.
Unfortunately, I have not been able to work out how to use Gratton nor my
attempt to contact the author of the plugin has been successful.

Le

On Tue, Oct 16, 2012 at 6:09 PM, Scott Makeig <smakeig at gmail.com> wrote:

> We routinely and quite successfully use ICA decomposition for this. Both
> CORRMAP and a new function by Nima Bigdely-Shamlo are quite good, we
> believe, at indicating which ICs (independent components) account for eye
> movements...
>
> Scott Makeig
>
>
> On Tue, Oct 16, 2012 at 10:09 AM, Ricardo Moura <ricardoojm at gmail.com>wrote:
>
>> By the way, does anyone know a plugin for ocular correction which can be
>> aplyed to continuous data?
>> I've checked and this plugin reported in the first email only works for
>> segmented data.
>>
>> Best,
>> Ricardo
>>
>>
>> On 11 October 2012 22:36, Arnaud Delorme <arno at ucsd.edu> wrote:
>>
>>> Dear Le,
>>>
>>> the correction method you mention is an EEGLAB plugin so you might want
>>> to contact the authors of the plugin directly.
>>> The problem might be that the plugin only works on continuous data not
>>> on segmented data.
>>> Hope this helps,
>>>
>>> Arno
>>>
>>> On 2 Oct 2012, at 08:17, Thang Le wrote:
>>>
>>> Hi everyone,
>>>
>>> I am running into a problem with the Gratton's ocular correction method
>>> in EEGLAB and I was wondering whether you could help me troubleshoot.
>>>
>>> I have been attempting to apply the Gratton's ocular correction method
>>> to a 64-channel data set. The two EOG channels are 65 and 66. So far I have
>>> downsampled the data to 256Hz, rereferenced and segmented. The values I
>>> used for Gratton's were:
>>>
>>> Number of EOG channel for regression: [65 66]
>>> Channels: [1 64]
>>> Window for Blink-detection: 24
>>> Voltage for Blink-detection: 200
>>>
>>> However, EEGLAB would give me an error message that says "To RESHAPE the
>>> number of elements must not change". I wasn't sure what to use for blink
>>> window but it does not look like 24 is the right value.
>>>
>>> Thank you so much for your help.
>>>
>>> Le
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>>
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>
>
> --
> Scott Makeig, Research Scientist and Director, Swartz Center for
> Computational Neuroscience, Institute for Neural Computation, University of
> California San Diego, La Jolla CA 92093-0559, http://sccn.ucsd.edu/~scott
>
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