[FieldTrip] time-frequeny analysis task vs resting

[Teresa Madsen]

Lorena,
As far as I know, I don't think there is a way currently built into
FieldTrip to adjust all experimental trials by the same separate baseline
period, but it is something I also prefer to do, since my pre-trial
"baselines" change across conditioning in my behavioral paradigm.  I've
written a custom function to perform this on my data, and it is part of the
code I'm offering to share in the email I just sent out asking another
question that relates to baseline correction and other issues.  Are you
interested?

~Teresa


On Mon, Dec 12, 2016 at 12:47 AM, Lorena Santamaria Covarrubias <
lorenalsc at hotmail.com> wrote:

> Hi Matt,
>
>
> Thank you for you reply Matt.
>
> I am working with ECoG. The tasks that participants have to perform is
> movements of hand and tongue, indicated by a visual stimuli.
>
> Five repetitions each motor task followed by a fixation cross on the
> screen and then the next motor task, in a random order.
>
> Resting state were recorded prior to the motor tasks during 5 minutes were
> participants has to look to a fixation cross and not perform any movement.
>
> If you need any other information please let me know.
>
> Thank you.
>
>
> ------------------------------
> *De:* fieldtrip-bounces at science.ru.nl <fieldtrip-bounces at science.ru.nl>
> en nombre de Matt Gerhold <matt.gerhold at gmail.com>
> *Enviado:* lunes, 12 de diciembre de 2016 5:26
> *Para:* FieldTrip discussion list
> *Asunto:* Re: [FieldTrip] time-frequeny analysis task vs resting
>
> What do your tasks entail? Can you provide more specific details regarding
> your experimental design? That will help clarify what the best analytical
> work-flow will be in your case.
>
> Matt
>
> On Mon, Dec 12, 2016 at 3:37 AM, Lorena Santamaria Covarrubias <
> lorenalsc at hotmail.com> wrote:
>
>> Good morning,
>>
>>
>> I am new in this topic and I have a basic question about baseline
>> correction (ft_freqbaseline) when I am trying to study the time frequency
>> analysis of task versus resting period.
>>
>>
>> I have two data-sets, one with the tasks information, 64 channels x 1s
>> epoch x 100 trials (50 trials task1 and 50 trials task2)  and then 5
>> minutes of continuous recording for resting state.
>>
>> I obtained the power spectrum for both tasks:
>>
>>
>> cfg              = [];
>> cfg.output = 'pow';
>> cfg.method  = 'tfr';
>> cfg.foi          =  8:1:130;
>> cfg.toi          =  0.3:0.01:1.3;
>> cfg.keeptrials   = 'no';
>>
>> cfg.trials = find(epoch_data.trialinfo == 1);
>> Task1Spec= ft_freqanalysis(cfg,epoch_data);
>>
>> cfg.trials = find(epoch_data.trialinfo == 2);
>> Task2Spec = ft_freqanalysis(cfg,epoch_data);
>>
>> But now I don't know how to do the baseline correction with the 5 minutes
>> continuous data to can compare the power spectrum of both tasks in relation
>> to the resting state.
>>
>> Maybe I missing something pretty basic, apologies in advance for it if
>> this is the case.
>>
>> Any suggestions will be appreciated.
>>
>> Thanks!!
>>
>>
>>
>>
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>>
>
>
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-- 
Teresa E. Madsen, PhD
Division of Behavioral Neuroscience and Psychiatric Disorders
Yerkes National Primate Research Center
Emory University
Rainnie Lab, NSB 5233
954 Gatewood Rd. NE
Atlanta, GA 30329
(770) 296-9119
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