Stimuli were presented through SR Research’s Experiment Builder program, and eyetracking was recorded using a remote view eyetracker, the EyeLink1000 (SR Research, Mississauga, ON, Canada), monocularly at 500 Hz. The recorded data were analyzed with SR Research’s analysis program, DataViewer. Areas of interest (AOIs) were defined as the eyes, nose and mouth. To investigate the proportion of fixations and fixation durations to salient features and non-salient features, two spatial-temporal parameters were calculated: the feature fixation index (FFI) and the feature duration index (FDI; Williams et al., 1999 (link)). The FFI is derived by dividing the number of fixations to salient features minus the number of fixations to non-salient features by the total number of fixations. The FDI is derived in the same manner. Indices range from -1 to +1, with positive values indicating more fixations or longer durations to salient features, and negative values indicating more visual attention to non-salient features.
Experiment builder program
Manufactured by SR Research
Sourced in Canada
Experiment Builder is a software program developed by SR Research to design and execute experiments. The program allows users to create and configure experimental paradigms, present stimuli, and collect data from participants. Experiment Builder provides a visual interface for building experiments without requiring extensive programming knowledge.
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Lab products found in correlation
5 protocols using experiment builder program
1
Measuring Visual Attention to Facial Features
2
Eye-tracking Analysis of Oculomotor Tasks
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Stimuli were presented through SR Research’s Experiment Builder program, and eye movements were recorded using a remote view eyetracker, the EyeLink1000 (SR Research, Ontario, Canada), monocularly at 500Hz. Data were analysed with SR Research’s analysis program, DataViewer. The memory-guided and self-paced saccade tasks were presented on a 17” screen with a resolution of 1024x768, 90cm away from the participant who rested on a chinrest. The PAN task was presented while participants underwent an fMRI scan on a 24” monitor at the rear of the bore, 115cm from the participant’s eye.
Saccades were detected using the EyeLink1000 system’s saccade detection algorithm: a saccade velocity threshold of 30°/sec, an acceleration threshold of 8000°/sec2 and a motion threshold of 0.15°.
Saccades were detected using the EyeLink1000 system’s saccade detection algorithm: a saccade velocity threshold of 30°/sec, an acceleration threshold of 8000°/sec2 and a motion threshold of 0.15°.
3
Tracking Eye Movements During Reading
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An EyeLink 1000 (SR Research, Ltd.) eye tracker was used to record eye movements as participants read sentences on a computer screen located 75 centimeters away. This system records eye movements every millisecond, with high spatial resolution. While eye movements were only recorded from the right eye, participants viewed the sentences binocularly. The experiment was programmed using the Experiment Builder program (SR Research, LTD). The sentences were presented in black on a white background using a monospaced Courier New font, where approximately 4.36 characters were equivalent to one degree of visual angle. All of the sentences were displayed on a single line of text.
4
Eye-tracking Protocol for Visual Search
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The stimuli were generated by the Experiment Builder program (SR Research, Ontario, Canada) and presented on a 19-inch CRT Screen at a screen resolution of 1024 x 768.
Participants placed their head on a chin rest .6m from the screen, in a dimly lit room with windows blacked-out to avoid luminance changes. Chin rest and desk heights were adjusted so that eye gaze was central to the display screen. Eye-movements were recorded using an EyeLink 1000 Tower Mount system, which runs with a spatial accuracy of .5-1 visual angle (˚), a spatial resolution of .01˚, and a temporal resolution of two milliseconds (500Hz). A five-point calibration was performed prior to each experimental block, as well as mid-block if necessary. A single-point drift correction to the calibration was made prior to every fifth trial.
The eye-tracking camera was linked to a separate host PC to the one displaying the search stimuli. EyeLink software (SR research, Ontario, Canada) was used to control the camera and collect data, and was synchronized via an Ethernet cable with the display PC.
Participants placed their head on a chin rest .6m from the screen, in a dimly lit room with windows blacked-out to avoid luminance changes. Chin rest and desk heights were adjusted so that eye gaze was central to the display screen. Eye-movements were recorded using an EyeLink 1000 Tower Mount system, which runs with a spatial accuracy of .5-1 visual angle (˚), a spatial resolution of .01˚, and a temporal resolution of two milliseconds (500Hz). A five-point calibration was performed prior to each experimental block, as well as mid-block if necessary. A single-point drift correction to the calibration was made prior to every fifth trial.
The eye-tracking camera was linked to a separate host PC to the one displaying the search stimuli. EyeLink software (SR research, Ontario, Canada) was used to control the camera and collect data, and was synchronized via an Ethernet cable with the display PC.
5
Eye-Tracking Experimental Setup and Metrics
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All the stimuli were presented on a display PC with a 23.6-in 16:9 color LED LCD monitor (520 mm × 290 mm, BenQ XL2410T). The stimuli were generated by the Experiment Builder program (SR Research, Mississauga, Ontario, Canada) at a screen resolution of 1,920 × 1,080. Audio feedback was provided by stereo Logitech speakers. Participants placed their head on a chin rest 650 mm from the screen, in a dimly lit room with windows blacked-out to avoid luminance changes. Chin rest and monitor heights were adjusted so eye gaze was central to the display screen. Response times (RTs) and accuracy were recorded via a standard PC mouse. Eye movements were recorded using an Eyelink 1000 system, running at a spatial accuracy of .25°-.5°, a spatial resolution of .01°, and a temporal resolution of 1 ms (1,000 Hz). The eye-tracking camera was linked to a separate PC to the one displaying the search stimuli. EyeLink software (SR Research) was used to control the camera and collect data, and was synchronized via an Ethernet cable with the display PC.
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