In both experiments, observers were seated 55 cm away from a 39 cm × 29 cm cathode-ray tube monitor (G255f, resolution 1280 × 1024 pixels, refresh rate 85 Hz; ViewSonic, Brea, CA) covering 39.0° × 29.5° of the visual field. Each observer's head was stabilized using a combined chin and forehead rest. Visual stimuli were generated using a PC with a GeForce GTX 970 graphics card (NVIDIA, Santa Clara, CA) and MATLAB R2018b (MathWorks, Natick, MA), Psychtoolbox 3.0.12 (Brainard, 1997 (link); Kleiner, Brainard, & Pelli, 2007 ; Pelli, 1997 (link)), and PLDAPS toolbox version 4 (Eastman & Huk, 2012 (link)).
Protocol detail
Visual Stimuli Generation and Presentation
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Corresponding Organization :
Other organizations : University of British Columbia, Google (United States), Friedrich-Loeffler-Institut
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Variable analysis
independent variables
- Distance of observers from the monitor (55 cm)
- Not explicitly mentioned
- Size of the cathode-ray tube monitor (39 cm × 29 cm)
- Resolution of the monitor (1280 × 1024 pixels)
- Refresh rate of the monitor (85 Hz)
- Visual field covered by the monitor (39.0° × 29.5°)
- Use of a combined chin and forehead rest to stabilize the observer's head
- PC with a GeForce GTX 970 graphics card used to generate visual stimuli
- MATLAB R2018b, Psychtoolbox 3.0.12, and PLDAPS toolbox version 4 used for visual stimulus generation
- No positive controls specified
- No negative controls specified
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