[Eeglablist] Gratton ocular correction issue

[Scott Makeig]

Le - I believe ICA should work well if trained on high-passed (> 1Hz) data
then applied to the wider-band (> 0.1 Hz) data. However, in any case you
should carefully scrutinize the output...

Scott

On Tue, Oct 16, 2012 at 3:22 PM, Thang Le <Thang.Le at park.edu> wrote:

> 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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>>>
>>>
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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
>>
>
>


-- 
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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