[pymvpa] Eyetracking analyses in PyMVPA

[Bruna Martins]

Hello again,

I tried out the eyetracking tutorial, and ran into an error when running
the down-sampling step:

>>> ds = fft_resample(raw_ds, 100, window='hann',
...                   chunks_attr='trial', attr_strategy='sample')
python(2418) malloc: *** error for object 0x7fbad35fc008: incorrect
checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
Abort trap: 6

Do you know where I'm going wrong?

Thanks so much for your help,
-Bruna

On Mon, Sep 17, 2012 at 3:53 PM, Bruna Martins <bruna.martins at usc.edu>wrote:

> Hi There,
>
> I am a complete newbie to PyMVPA, and currently doing an eyetracking
> study. I'm currently navigating the eyetracking tutorial, but wanted to get
> your pearls as well- thanks for your patience in advance.  My study has a
> within-subjects design, where each trial is either condition A or B, and
> we're looking at gaze differences between the conditions. Stimuli are
> randomly presented either on the left or the right side of the screen, so
> the analysis is a little complex . I am hoping to do two different things:
>
> 1. Input difference scores between  (Xcoord- Xcenter)  and (Ycoord-
> Ycenter) for each trial- there will be a different number of trackable
> instances for each timepoint (depending on whether track was lost, blink
> frequency, etc) to predict condition A vs B
>
> 2. Input a scalar value indicating the percentage of time spent within the
> stimulus area of interest on the screen (ie, 0.70 = on the stimulus for 70%
> on stimulus), for each trial, and again predict whether the trial was of
> condition A or B, but this time have one value per trial
>
> I was wondering how you would recommend approaching the two analyses
> outlined above.
>
> Thanks so much for your help,
> Bruna Martins
>
>
> --
> *Bruna S. Martins*
> *
> *
> Ph.D. Student- Clinical Psychology
> Emotion & Cognition Lab- Gero 341
> University of Southern California
> (213) 821- 5701
>
>


-- 
*Bruna S. Martins*
*
*
Ph.D. Student- Clinical Psychology
Emotion & Cognition Lab- Gero 341
University of Southern California
(213) 821- 5701
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