NBS Presentation experiment eye-data analysis

[L]

Hi, I’m sorry if this is the wrong place to post this but I have ran into a couple of problems and am unable to get official support for this so I thought I would post in this forum.

I have designed an experiment in NBS Presentation and wanted to add some eyetracking data to my project. I managed to get Presentation to work with Tobii using the plugins, but I am a little confused about some things. FYI I’m using Tobii studio version 1.7.3.

For each of the 160 trials in my experiment, a trigger is sent and appears in the timeline of the screen recording in Tobii. I then generate segments for each trial (trigger start at start of the event and end is set to start of event + 3s, the length of a trial, so the segments are 3s in length from the onset). There are 8 different experimental conditions, and this is where I am a little confused. I have read the documentation but it is very limited in its depth.

1. Do I need to create a ‘scene’ for each of these 8 experimental conditions? So far I was under the impression that I should filter for a condition, and then drag (manually??) all of its respective segments into a scene to create an aggregation of data under that condition, and then repeat for subsequent conditions (manually??) in new scenes. I wasn’t sure if this was right, so I wrote a script that processes the raw data and calculates time on targets for each condition etc, and this all looks very reasonable, but I want to replicate this in Tobii for various obvious reasons. However, when I follow the aforementioned steps in Tobii and select the ‘analysis’ tab, the numbers look way off which makes me think I’m doing this wrong.

2. I also have an issue when it comes to defining AOIs, and this might be due to the version of Tobii Studio that I’m using. Is it in any way possible to accurately define AOIs using x-y screen coordinates or must I manually draw them on every scene? Given my 8 exp. conditions, each with the same AOI setup (a box in each of the 4 screen quadrants) this means I need to manually draw the AOIs for each scene as accurately as I can. This is very error prone and a pretty terrible approach, but for the life of me I cannot find a way to define AOIs via typing in screen coordinates. [**Because I use NBS presentation with a single PC I am unable to view the stimulus presentation in the video playback because pres. takes over the screen. For that reason I can’t define the AOIs manually just be drawing over the stimuli because I don’t know exactly where they are.]

Once again, sorry if this is in totally the wrong place but I could really use some support. Any information that might help would be greatly appreciated.

[Grant [Tobii]]

Hi @fffrost, Tobii Studio is part of the Tobii Pro business department.

This forum is intended for support with the Tobii Tech EyeX and C4 Eye Tracker and associated SDK’s.

Please get in touch with Tobii Pro Support department directly @ http://www.tobiipro.com/contact/contact-support/ for a prompt answer to your query. Thank you for your understanding.

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