Betere Dingen

| 23-05-2013 14:52Yarbus

In his famous paper that was translated to English in 1967, Yarbus showed there was an effect of task on gaze direction. His subject looked at the same painting 7 times, with different assigments, and there are different patterns to be observed in the eye-movement traces:

2013-05/yarbus_the_visitor.jpg

For the defence of my dissertation, I repeated this experiment and got a similar result:

2013-05/subject6.png

There is a problem with this way of representing eye-movements though: the fixations are underrepresented, as each pixel can only be painted red once. Saccades are probably overrepresented as well, since the coordinates of samples are simply connected with a red line. The solution to this is to use heatmaps:

2013-05/heatmaps.png

And now we can identify another problem: the direction and start- and end-points of the saccades were apparently very informative in the original picture (e.g. when shifting gaze back and forth between faces in the painting). This means that for investigating task-driven gaze, it is probably best to take scanpaths into account, along with gaze distributions.

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