3/3/2009
Tobii & E­prime
Tobii / E­Prime eye tracking integration
• Combines E­Prime experiment design and control with Studio’s
powerful visualizations
• Allows communication between the TET Server of the eye tracker and
E­Prime software
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3/3/2009
Tobii / E­Prime eye tracking integration
• Dynamically generate, complex and randomly presented
stimuli
• Create paradigms which change based on subject eye
gaze data, AOI hit tests, fixation, user interaction
• Very accurate timing for measuring response times
HARDWARE SETUPS
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3/3/2009
Using E­prime for presentation and for collecting
eye movement data
• E­prime is used to present the
stimulus and collect eye movement
data
• Use the TET package call in E­prime
• Use Tobii Studio for calibrating the
subjects before the test
• Gaze contingency tests possible
• Use only E­prime for analyzing the
data
• No visualizations of eye movement
data possible
Using E­prime for presentation and Studio for
collecting eye movement data
• E­prime presents the stimulus and Tobii
Studio collects the eye movement data.
• Use ClearView package call in E­prime
• Use VGA capture card and External video
stimulus in Studio
• Events are sent from E­prime to Studio, use
segments and scenes for splitting up the
recording
• VGA switch needed to change the source
image shown on the eye­tracker screen.
• Use Tobii Studio to analyze and visualize eye
movement data
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3/3/2009
E­PRIME
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3/3/2009
E­Prime modules
• E­Studio: design and create experiments. Graphical based.
• E­Basic: design and create experiments. Script based.
• E­Run: converts an E­Studio experiment into a script and runs the
experiment.
• E­Merge: combines single session data files into a single multisession data
file
• E­DataAid: data management application, allows to filter, edit and export
data to an external Statistical package.
• E­Recovery: converts an incomplete E­Run text file into an E­prime data
file.
E­Studio interface
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3/3/2009
E­objects and packages
• E­objects are instructions that can be dragged onto the
procedure timeline
• Packages are sets of E­objects that are used to interact
with the eye tracker
E­PRIME EXTENSIONS SETUP
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3/3/2009
E­Prime Extensions for Tobii
• Drag and drop Tobii eye tracker objects and stimuli on
timeline
TET packagecall ­ control and collect data directly
from the eyetracker
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3/3/2009
TET packagecall:
• TET Open: tells the eye tracker to start collecting eye movement data
• TET TrackStatus: displays the track status window, useful when setting up the
eye tracker.
• TET OpenGazeDataFile: creates and opens a tab delimited raw gaze data file
(.gazedata)
• TET StartTracking: tells eye tracker to start saving eye tracking data
• TET WaitForFixation: halts the experiment until the participant fixates on an object
for a given amount of time in ms.
• TET StopTracking: tells the eye tracker to stop collecting eye movement data
• TET GazeReplay: replays the scanpath on top of the stimulus
• TET CloseGazeDataFile: saves the gaze data file
• TET Close: closes the connection to the eye tracker
• WriteGazeDataFile: writes a line of data to the GazeData file
ClearView packagecall:
• Init: initializes the connection to Studio
• SendGenericEvent: sends a generic event to Studio.
Interpreted as the keypress controlling event logging during
recordings
• SendLogEvent: sends an event to Studio for example a
response or the stimulus name
• StartRecording: triggers Studio to start recording the test
• StopRecording: triggers Studio to end the recording
• Uninit closes the connection to Studio
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