Presentation on theme: "Cyclical vs. Stochastic Visual Search Models Andrew Elias 11 Aug 2011 NRL Code 7440 branch meeting How a Target’s Effect on the Eye Varies with Distance."— Presentation transcript:
Cyclical vs. Stochastic Visual Search Models Andrew Elias 11 Aug 2011 NRL Code 7440 branch meeting How a Target’s Effect on the Eye Varies with Distance &
Eye Tracking Fixations: eye stops (avg. 400 ms) Saccades: jerky eye movements, no data intake
The Experiment 30 FA18 pilots 72 images 24 distinct maps With/without targets sorted: 3 clutter levels High/low local clutter near target Target:
Cyclical vs. Stochastic Visual Search Models Cyclical: avoid re- examining things Stochastic: don’t worry about re-examining things
Conclusion Stochastic model is correct. (at least for the majority of our trials)
Further Research Comparing clutter levels or pilot experience levels: do models/parameters change? Using model parameters as a new measure of global clutter (!!!) or pilot skill Analyze subjects/maps individually to see if some use/allow Cyclical model.
How a Target’s Effect on the Eye Varies With Distance Purpose: fixation “size” small?large?fuzzy?
Conclusions 55 px is the threshold for glance-away saccades Attention-grabbing radius may be fuzzy (at least for a large group), but probably spans a subset of the the 55- 450 px zone. Maybe ~120 px These values may be target-dependent and map- dependent. –‘450 px’ value is especially map-dependent. Reaction “time” is less than two saccades.