ScanGraph Export

ScanGraph Export writes fixation sequences as letter-coded strings in a .txt file for analysis in ScanGraph, the external scanpath-similarity tool of Doležalová and Popelka (2016, Journal of Eye Movement Research, 9(4), doi:10.16910/jemr.9.4.5).

ScanGraph-style network analysis is already built into GazePlotter: the Scanpath Similarity plot has a ScanGraph network view, powered by the Scanpath Similarity metrics. Use this export only if you want to run the standalone ScanGraph tool.

Output format

• Each AOI is assigned a letter; each participant’s fixations become a string of those letters.
• The strings come from the same encoder the Scanpath Similarity metrics use: only fixations are encoded, merged AOIs share one letter, and fixations outside every AOI become #. The export always covers all AOIs, all participants, and the full recording. A plot narrowed by an AOI selection, participant selection, or time range analyses correspondingly narrowed strings.
• The file header lists the legend (which letter maps to which AOI, and # for no fixation), followed by one sequence per participant.
• The file doubles as an OGAMA “Similarity Measurements” file, so it can be uploaded back into GazePlotter as ordinal scanpath data.

Exporting

1. Click Export in the workspace Ribbon.
2. Under Other options, click the ScanGraph Format card.
3. Select the Stimulus.
4. Choose the string form: Original keeps one letter per fixation (dwell duration weighs in); Collapsed folds consecutive fixations in the same AOI (order only).
5. Click Export ScanGraph.

Using it in ScanGraph

1. Open the ScanGraph web app.
2. Upload the exported .txt file.
3. Run the analysis to generate similarity networks and visualizations.