[Mne_analysis] MNE source estimate analysis with multiple conditions

Wed May 31 02:13:17 EDT 2017

hi Lin,

the label_sign_flip is used to average time courses within a label
in order to avoid signal cancellations.

Alex

On Tue, May 30, 2017 at 6:54 PM, Lin Wang <wanglinsisi at gmail.com> wrote:

> Hi everyone,
>
> I have a followup question regarding the group level contrast: Do I need
> to apply mne.label_sign_flip before averaging the activaitons across all
> subjects?
>
> I used "fixed=False, loose=0.2" to get the inverse solution, then I
> defined "pick_ori="normal"" when applying the inverse solution to the
> evoked difference (evoked1 - evoked2) for each subject.
>
> I'm wondering if I should flip the signs when averaging the activations
> across subjects.
>
> Thanks for the help!
>
> Lin
>
>
>
> On Tue, Apr 18, 2017 at 10:55 AM, Lyam Bailey <Lyam.Bailey at dal.ca> wrote:
>
>> Thanks Andy!
>>
>>
>> ---------------------------------------------------------
>>
>> Lyam Bailey, BSc.
>>
>> Graduate Student
>> Department of Psychology & Neuroscience
>> Dalhousie University
>>
>> ------------------------------
>> *From:* mne_analysis-bounces at nmr.mgh.harvard.edu <
>> mne_analysis-bounces at nmr.mgh.harvard.edu> on behalf of Andrew R. Dykstra
>> <andrew.dykstra at uni-heidelberg.de>
>> *Sent:* Monday, April 17, 2017 8:08:15 PM
>>
>> *To:* Discussion and support forum for the users of MNE Software
>> *Subject:* Re: [Mne_analysis] MNE source estimate analysis with multiple
>> conditions
>>
>>
>> Hi Lyam,
>>
>>
>> See here:
>>
>> http://martinos.org/mne/dev/generated/mne.epochs.equalize_ep
>> och_counts.html
>>
>>
>> HTH,
>>
>> Andy
>>
>> On 2017-04-17 06:04 PM, Lyam Bailey wrote:
>>
>> I suppose we could equalise the number of epochs per condition, in theory
>> (although I'm not familiar with the best way to do this). Basically the
>> unequal epoch numbers arose due to problems during data collection, whereby
>> a few random trials were lost in almost every subject.
>>
>>
>> Regards
>>
>> Lyam
>>
>>
>> ---------------------------------------------------------
>>
>> Lyam Bailey, BSc.
>> Graduate Student
>> Department of Psychology & Neuroscience
>> Dalhousie University
>>
>> ------------------------------
>> *From:* mne_analysis-bounces at nmr.mgh.harvard.edu
>> <mne_analysis-bounces at nmr.mgh.harvard.edu>
>> <mne_analysis-bounces at nmr.mgh.harvard.edu> on behalf of Denis-Alexander
>> Engemann <denis.engemann at gmail.com> <denis.engemann at gmail.com>
>> *Sent:* Monday, April 17, 2017 4:40:11 PM
>> *To:* Discussion and support forum for the users of MNE Software
>> *Subject:* Re: [Mne_analysis] MNE source estimate analysis with multiple
>> conditions
>>
>> Does your experimental logic allow you to equalize the number of epochs
>> per conditions or do you have some rare events by design?
>>
>> Denis
>>
>> On Mon, Apr 17, 2017 at 11:30 AM Lyam Bailey <Lyam.Bailey at dal.ca> wrote:
>>
>>> Hi Alex,
>>>
>>>
>>> Thanks for the tip! I'm glad you mentioned this because as it happens, I
>>> don't have the same number of epochs for each condition. Can you suggest a
>>> work around?
>>>
>>>
>>> Regards
>>>
>>> Lyam
>>>
>>>
>>> ---------------------------------------------------------
>>>
>>> Lyam Bailey, BSc.
>>> Graduate Student
>>> Department of Psychology & Neuroscience
>>> Dalhousie University
>>>
>>> ------------------------------
>>> *From:* mne_analysis-bounces at nmr.mgh.harvard.edu <
>>> mne_analysis-bounces at nmr.mgh.harvard.edu> on behalf of Alexandre
>>> Gramfort <alexandre.gramfort at telecom-paristech.fr>
>>> *Sent:* Tuesday, April 11, 2017 6:31:55 PM
>>> *To:* Discussion and support forum for the users of MNE Software
>>>
>>> *Subject:* Re: [Mne_analysis] MNE source estimate analysis with
>>> multiple conditions
>>> > This would be dSPM(a) - dSPM(b).
>>>
>>> tiny detail: this will only be true if the two conditions have the
>>> same number of epochs averaged in each condition.
>>>
>>> Alex
>>> _______________________________________________
>>> Mne_analysis mailing list
>>> Mne_analysis at nmr.mgh.harvard.edu
>>> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/mne_analysis
>>> Mne_analysis Info Page - Harvard University
>>> <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/mne_analysis>
>>> mail.nmr.mgh.harvard.edu
>>> Mne_analysis -- Discussion and support forum for the users of MNE
>>> Software About Mne_analysis
>>>
>>>
>>>
>>>
>>> The information in this e-mail is intended only for the person to whom
>>> it is
>>> addressed. If you believe this e-mail was sent to you in error and the
>>> e-mail
>>> contains patient information, please contact the Partners Compliance
>>> HelpLine at
>>> http://www.partners.org/complianceline . If the e-mail was sent to you
>>> in error
>>> but does not contain patient information, please contact the sender and
>>> properly
>>> dispose of the e-mail.
>>>
>>> _______________________________________________
>>> Mne_analysis mailing list
>>> Mne_analysis at nmr.mgh.harvard.edu
>>> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/mne_analysis
>>>
>>>
>>> The information in this e-mail is intended only for the person to whom
>>> it is
>>> addressed. If you believe this e-mail was sent to you in error and the
>>> e-mail
>>> contains patient information, please contact the Partners Compliance
>>> HelpLine at
>>> http://www.partners.org/complianceline . If the e-mail was sent to you
>>> in error
>>> but does not contain patient information, please contact the sender and
>>> properly
>>> dispose of the e-mail.
>>>
>>
>>
>> _______________________________________________
>> Mne_analysis mailing list
>> Mne_analysis at nmr.mgh.harvard.edu
>> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/mne_analysis
>>
>>
>> The information in this e-mail is intended only for the person to whom it
>> is
>> addressed. If you believe this e-mail was sent to you in error and the
>> e-mail
>> contains patient information, please contact the Partners Compliance
>> HelpLine at
>> http://www.partners.org/complianceline . If the e-mail was sent to you
>> in error
>> but does not contain patient information, please contact the sender and
>> properly
>> dispose of the e-mail.
>>
>>
>
> _______________________________________________
> Mne_analysis mailing list
> Mne_analysis at nmr.mgh.harvard.edu
> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/mne_analysis
>
>
> The information in this e-mail is intended only for the person to whom it
> is
> addressed. If you believe this e-mail was sent to you in error and the
> e-mail
> contains patient information, please contact the Partners Compliance
> HelpLine at
> http://www.partners.org/complianceline . If the e-mail was sent to you in
> error
> but does not contain patient information, please contact the sender and
> properly
> dispose of the e-mail.
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20170531/8c119e59/attachment-0001.html 