Visual stimuli were presented using a LED projector (Propixx, VPixx Technologies) that displayed the images on a rear-projection screen (Stewart Filmscreen). Stimulus presentation and task were controlled by MonkeyLogic software (https://www.brown.edu/Research/monkeylogic/ ; https://monkeylogic.nimh.nih.gov/ ; 56 (link)). A photodiode was used to measure stimulus timing. Eye position was monitored and recorded using an infrared eye-tracking camera (ETL-200, ISCAN). Trials were aborted if eye position deviated from the fixation point (threshold typically 1 dva radius).
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Visual Stimuli Presentation and Eye Tracking Protocol
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Corresponding Organization : Washington University in St. Louis
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Variable analysis
independent variables
- Stimulus presentation and task
- Eye position
- Fixation point (threshold typically 1 dva radius)
- Stimulus timing (measured using a photodiode)
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