Data Viewer 3.1

Sam Hutton

Data Viewer 3.1

Outline:

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• Background / Basics
• Recent additions

1) Aggregate Mode / Aggregate Reports

2) Creating Static, Dynamic, Difference Fixation Maps (Heat Maps)

3) Interest Area Manipulation

4) Time Series (Binning) Reports

5) Multiple Interest Period Creation

6) Event Editing

SR-Research Timeline

Sam Hutton, Marcus Johnson

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SR Research Ltd

(Me and Ben Tatler buy the first EL-IIs in UK)

Jiye

• Added "Add/Edit Event Mode" the Temporal Graph View
• Added grid lines to the Temporal Graph View
• Added a sample cursor line to the current mouse position in the Temporal Graph View
• Added "Sample Info" button and floating window to the Temporal Graph View
• Added interest period boundaries to the Temporal Graph View
• Supported displaying dynamic interest areas in the Temporal Graph View
• Added "IA Shape Actions" option to support the following operations when interest areas are selected:
• Conversion between different interest area shapes
• Horizontal or vertical flip
• Rotating interest areas
• Resizing/rescaling interest areas
• Moving interest areas
• Added interest area "Link" option to replace multiple interest areas with a linked object; added "Unlink" option to restore the original interest areas
• Added "Create Output Report for all Custom Interest Periods" option to the Reports
• Added option to create multiple consecutive duration-based interest periods
• Added "Use Average Aggregate Cursor" option to Animation View Preferences
• Allowed to import messages relative to the currently-selected interest period
• Added "Gaze Cursor Transparency (0.0 - 100.0)" to Animation View Preferences
• Added "Video Handler" option to Animation Preferences (Windows version only)
• Added support for playing back .mov video files in the Animation View (for the data collected with SR Research Experiment Builder)
• Added the following variables to the Trial Report:
• MEDIAN_SACCADE_AMPLITUDE
• MEDIAN_FIXATION_DURATION
• Added the following variables to the Saccade and Fixation Report:
• CURRENT/PREVIOUS/NEXT_SAC_BLINK_START
• CURRENT/PREVIOUS/NEXT_SAC_BLINK_END
• CURRENT/PREVIOUS/NEXT_SAC_BLINK_DURATION
• Provided options to create a shorter sample report (i.e., down-sampling)
• Added "File -> Unpack" menu option
• Added "Selected Freehand Point" property to freehand interest areas for the precise adjustment of vertex coordinate
• Added "Remember Last Browsed Directory" for some default directories
• Added HTARGET_DISTANCE_BIN, HTARGET_X_BIN, HTARGET_Y_BIN, SAMPLING_RATE, and SAMPLE_INTERVAL variables to the Time-Course Analysis Report
• Added "Start Event Offset" option to the Reaction Time Definitions
• Added "Animation Background Color" to the Animation View preferences
• Added "Apply Blink Correction in the Sample Report" option to the Data Filters preferences

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Data Viewer 3.1

What is in the .edf?

A mixture of Samples, Events and Messages – all of which are time stamped

Samples

Samples contain Time, X, Y (in screen pixels) and pupil size (in arbitrary units)

6079861 503.7 680.3 972.0 .....

Extra columns can contain information such as resolution (ppd) / Velocity / Input status

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Missing samples are reported as “.”

Events

Events are either Fixations, Saccades, or Blinks (which are always wrapped in a saccade).

Saccade / Fixation events always come in pairs…

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Messages typically flag up trial events such as stimulus onset / keyboard response etc:

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Some messages are intended specifically for Data Viewer:

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What is NOT in the .edf?

• Trial Stimui such as images / text / Videos
• Interest Areas

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The .edf contains *pointers* -special messages that tell DV where to find the trial resources / where to draw the IAs.

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• Trial Grouping is incredibly useful / powerful
• But it works best if you remember to include useful grouping variables in your experiment…
• They can always be added via the Trial Variable Manager and Trial Variable Value Editor

Trial Grouping / Aggregate Mode / Aggregate Reports

• Allows data that has been aggregated over trials / participants (e.g. via Trial Grouping) to be VIEWED
• Dynamic Heatmaps / Bee-swarm
• Also enables the creation of aggregate reports (useful for exploratory data analysis)
• Aggregate Event Statistics Report
• Aggregate Interest Area Report

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Aggregate Mode

• Heat maps can be created for individual trials or groups of trials
• A meaningful comparison of heatmaps requires that they both have the same scale
• Alternatively – create difference maps

Fixation (Heat) Maps

• Create Left / Right Eyes, Mouth / Nose (adjust points)
• Save as template
• Apply to all trials (using grouping trick)
• Resize Edges of WholeFace
• Resize Eyes by %
• Flip IAs vertically and apply to upsidedown faces
• Rotate selected IAs by 45degs
• Unrotate and link (converting to freehand first)
• Rotate again

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Interest Area Manipulation

Time Series (Binning) Analysis:

Very useful for Visual World tasks

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Data Viewer: Time Series

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“The dog hated the shark at the boxing match because he...”

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But also very useful for any experiment involving dynamic stimuli (e.g. videos) and even pupillometry research.

Preparing the Data…

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1. Import multiple .edf files
2. Save Viewing Session….
3. Remove Practice Trials
4. Check messages (add more if nec…)
5. Create Interest Period
6. Check Cyclopean Mode

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Most research is monocular, but sometimes you have to record from the “other” eye…

Things can get complicated when choosing LEFT_ / RIGHT_ variables for DV Reports….

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Top Tip!!!

Check the Cylopean Mode preference and the AVERAGE_* Variables will contain data from whichever eye was recorded.

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Data Viewer: Time Series

Data Viewer: Time Series

Simultaneously create multiple sequential Interest Periods:

Interest Periods

Simultaneously create Reports for all Interest Periods:

Data Viewer

Event Editing: Saccades and Fixations can be edited and inserted

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Data Viewer: Event Editing

Relevant metrics (e.g. duration of saccade and subsequent fixation are automatically updated.

Boj003.wav: Trail 35

Event Editing: Saccades and Fixations can be edited and inserted

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Data Viewer: Event Editing

Relevant metrics (e.g. duration of saccade and previous / subsequent fixation are automatically updated.

Undo saccade insertions by deleting or merging fixations

Thank you – any questions?

Eye tracking data analysis used to be a lot harder....

Raw data was a printout…

Or voltages for x / y position

Researchers had to write their own software to “automate” any analysis