[pymvpa] Eyetracking analyses in PyMVPA

Bruna Martins bruna.martins at usc.edu
Mon Sep 17 22:53:36 UTC 2012

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
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