[pymvpa] Mapping event structure from text file to fMRI dataset

[Yaroslav O Halchenko]

On Thu, 15 Aug 2019, Lyam Bailey wrote:

>    Dear users

>    I have an fMRI dataset comprising 113 volumes (from a single run). I would
>    like to map information about events during the fMRI run - experimental
>    condition and onset time - to the dataset. The events structure is stored
>    in a .txt file with four columns: run#, experimental condition, unique
>    stimulus, and onset time. It looks something like this

>    0    Y    porch    12.030224
>    0    Y    victory    15.530834
>    0    P    kingdom    19.031396
>    0    Y    evening    22.531978
>    I've tried to map this info to the fMRI dataset in the following way:
>    bold_fname = 'path_to_fMRI_dataset'
>    exp_data = pd.read_csv("path_to_txt", delimiter='\t', header = None)
>    exp_data.columns = ['run','condition','word','onset']

>    ds = fmri_dataset(bold_fname, targets = None)
>    ds.sa.time_coords = exp_data.onset
>    ds.sa.targets = exp_data.condition

so you have an event related design.  The most straightforward approach
would be first to fit GLM to your conditions.
Have a look at http://www.pymvpa.org/tutorial_eventrelated.html

-- 
Yaroslav O. Halchenko
Center for Open Neuroscience     http://centerforopenneuroscience.org
Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755
Phone: +1 (603) 646-9834                       Fax: +1 (603) 646-1419
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