data extraction in fMRI

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This topic contains 3 replies, has 3 voices, and was last updated by  JB 5 months ago.

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  • #21382 Reply

    giovanni
    Participant

    Hello,

    I tried to reproduce your subject.mat files. I understand one colonn by time-series and region. I extracted (using marsbar and my data) the Bold signal in each region and I found higher values (300, 350, etc..) that correspond to intensity values.

    I would like to know what represent exactly the values in your subject1.mat file. I found these values very low (0.0014, 0.00085, 0.0020, etc..).

    Thanks for your response.

    Best
    Giovanni

    #21413 Reply

    JB
    Participant

    Hi Giovanni,

    Could you also send me one of your matrices (preferably one that corresponds to the nifti file I asked you in the previous email)?

    Best wishes,

    Joana

    #21961 Reply

    gozdekizilates
    Participant

    Hi Joana,

    I extracted (using marsbar and my data) the Bold signal in each region and I found higher values (from 500 to 900), too.

    I would like to know what represent exactly the values in your subject1.mat file. I found these values very low and negative.

    Thanks
    Gozde

    #22181 Reply

    JB
    Participant

    Hi Gozde,

    The values are low and negative probably because we regressed out the signals from the white matter and cerebrospinal fluid as well as the motion parameters during image preprocessing. This is a common step in fMRI analyses, it’s up to you whether to apply it or not, but I recommend you do it.

    Best,

    Joana

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