Experiment builder

The experiment took place at the Faculty of Psychology of the University of Vienna. All three parts of the experiment (the expertise questionnaire, the explicit rating scale, and the IAT) were administered on a 19-in. TFT monitor with a resolution of 1280 × 1024 pixels and a refresh rate of 60 Hz. A keyboard and a standard USB computer mouse were placed in front of the participants. A table lamp served as an indirect light source behind the monitor. A chin rest and forehead strip ensured a viewing distance of 57 cm. Stimuli presentation was programed using the SR Research Experiment Builder (version 1.10.165; SR Research, 2004). Data were analyzed using the R programming software (version 3.2.4 Revised, R Core Team, 2016 ), with the following additional packages: the ‘MASS’ package (Venables & Ripley, 2002 ) for defining contrasts, the ‘lmerTest’ package (Kuznetsova, Brockhoff, & Christensen, 2016 ) for running linear mixed models, the ‘effects’ package (Fox, 2003 ) for plotting the results, the ‘lsmeans’ package (Lenth, 2016 ) for comparing slopes of fitted lines, and the ‘schoRsch’ package (Pfister & Janczyk, 2015 ) for removing RT outliers.

An EyeLink 1000 Plus (SR Research Ltd, Ottawa, Canada) recorded binocular eye movements (see [22 ]) at 500 Hz. Participants sat 65 cm away from a 24-inch monitor (1280 × 1024 pixels, 120 Hz) and a chinrest was used to prevent head movements. Timing and stimuli presentation were handled with Experiment Builder (SR Research Ltd, Ottawa, Canada). Room luminance and screen background (grey coloured; R = 180, G = 180, B = 180) were kept constant throughout the experiment and they were identical for all participants.

Eye movements were recorded using the Eyelink II eye tracker (head-mounted binocular eye tracker, 500 Hz temporal resolution, 0.2° spatial resolution; SR Research Ltd., Mississauga, ON, Canada). Stimuli were presented on a 19-in CRT-monitor (screen resolution 1024 × 768 pixels; refresh rate 110 Hz) at a viewing distance of 62.5 cm. The fixation cross was white with a luminance of 56 cd/m² viewed against a black background of luminance of less than 0.1 cd/m². The initial saccadic target was an orange (RGB values of 255, 102, 0) circle (diameter of 0.5°). The reference point was a white (255,255,255) circle (diameter of 0.5°), presented simultaneously with the saccadic target either with an overlap of (0.07°) over the saccadic target, or at the peripheral location (4°) away from the saccadic target.
Subjects were seated in a dimly lit room in a stationary chair with their head stabilized by a chinrest. Stimulus presentation, eye movement and manual keyboard response data acquisition were achieved using real-time experimental control software (Experiment Builder, SR Research Ltd.). At the start of each experiment session, a nine-point gaze calibration was performed followed by a nine-point validation.

Stimuli were presented on a 17” Graphics Series G90fB CRT monitor with the refresh rate of 85 Hz. Reaction time (RT) measures were based on standard keyboard responses. Experiments were controlled by the software Experiment Builder (SR Research Ltd., Ontario, Canada). Participants were seated 57 cm away from the monitor, centered with respect to display and keyboard.