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-rw-r--r--docs/user_guide/gaze_analysis_pipeline/aoi_analysis.md5
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/user_guide/gaze_analysis_pipeline/aoi_analysis.md b/docs/user_guide/gaze_analysis_pipeline/aoi_analysis.md
index 2b64091..c2a6ac3 100644
--- a/docs/user_guide/gaze_analysis_pipeline/aoi_analysis.md
+++ b/docs/user_guide/gaze_analysis_pipeline/aoi_analysis.md
@@ -100,6 +100,11 @@ The second [ArLayer](../../argaze.md/#argaze.ArFeatures.ArLayer) pipeline step a
Once gaze movements are matched to AOI, they are automatically appended to the AOIScanPath if required.
+!!! warning "GazeFeatures.OutsideAOI"
+ When a fixation is not looking at any AOI, a step associated with an AOI called [GazeFeatures.OutsideAOI](../../argaze.md/#argaze.GazeFeatures.OutsideAOI) is added. As long as fixations are not looking at any AOI, all fixations/saccades are stored in this step. In this way, further analysis are calculated considering those extra [GazeFeatures.OutsideAOI](../../argaze.md/#argaze.GazeFeatures.OutsideAOI) steps.
+
+ This is particularly important when calculating transition matrices, because otherwise we could have arcs between two AOIs when in fact the gaze could have fixed itself outside in the meantime.
+
The [AOIScanPath.duration_max](../../argaze.md/#argaze.GazeFeatures.AOIScanPath.duration_max) attribute is the duration from which older AOI scan steps are removed each time new AOI scan steps are added.
!!! note "Optional"