Stimuli were presented on a VIEWpixx/3D (VPixx Technologies, Saint-Bruno, QC, Canada) display (1920 × 1200 pixels,120 Hz refresh rate). The display had a mean luminance of 100 candela/m2 and was gamma corrected using a photospectrometer (Jaz; Ocean Optics, Largo, FL, United States). Participants viewed the display from 57 cm and were required to wear wireless liquid crystal display (LCD) shutter glasses that were controlled by an infrared emitter (NVIDIA GeForce 3D; NVIDIA, Santa Clara, CA, United States). Here, binocular separation of the stimuli, with minimal crosstalk, was achieved by synchronizing the VIEWpixx refresh rate (120 Hz, thus 60 Hz per eye) with the toggling of the LCD shutter glasses (Baker et al., 2016 (link)).
Viewpixx 3d
Manufactured by VPixx Technologies
Sourced in Canada
The VIEWPixx 3D is a high-performance display system designed for visual research applications. It features a 1920 x 1080 pixel resolution display with a 120 Hz refresh rate, enabling the presentation of 3D visual stimuli. The system supports a range of connectivity options, including HDMI, DVI, and DisplayPort inputs.
Automatically generated - may contain errors
7 protocols using viewpixx 3d
1
Stereoscopic Stimulus Presentation Setup
2
Visual Perception in Stereoscopic Displays
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Visual stimuli were presented on a VIEWPixx 3D (LCD panel with LED backlight) with a screen resolution of 1920 × 1080 pixels, a refresh rate of 120 Hz, a pixel pitch of 0.27 mm (subtending 0.053 visual angle), and a maximum luminance of approximately 100 cd/m2 (VPixx Technologies, Montreal, Canada). Stereoscopic images were presented with a 3DPixx shutter glasses system (Nvidia, Santa Clara, CA, USA).
During the experiment, the participant sat in a dark room in a chinrest approximately 29.3 cm from the display with their eyes aligned with the center. Irregularly shaped pieces of black paper were placed along the edges of the display so that participants could not use the edges as a reference. All stimuli were presented using Psychtoolbox (version 3.0.15) and OpenGL in MATLAB (MATLAB R2019b; The MathWorks, Natick, MA, USA).36 ,37 (link)
During the experiment, the participant sat in a dark room in a chinrest approximately 29.3 cm from the display with their eyes aligned with the center. Irregularly shaped pieces of black paper were placed along the edges of the display so that participants could not use the edges as a reference. All stimuli were presented using Psychtoolbox (version 3.0.15) and OpenGL in MATLAB (MATLAB R2019b; The MathWorks, Natick, MA, USA).36 ,37 (link)
3
High-Performance Stereo Presentation Setup
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The VIEWPixx 3D (VPixx Technologies, Montreal, Canada) is an LCD panel with an LED backlight. It is a high-performance system intended to replace CRT monitors in vision-science applications. When paired with an active-shutter-goggle system (Nvidia 3D Vision, Nvidia, Santa Clara, CA), it is capable of stereo presentation at 120 Hz. This system was driven by a 2013 Mac Pro (Apple, Cupertino, CA), with code written in MATLAB using Psychtoolbox 3.0.11.
4
Eye-tracking Protocol for Visual Perception
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Testing occurred at the University of Montreal (Montreal, Canada) and at the Centre of Neuroscience Research of Lyon (CNRL; Lyon, France) with similar apparatus for eye-movement recording. Participants sat in a dark room 57 cm away from a high-speed computer screen (at CNRL: 15.7*11.8 inches, Visual Stimulus Generator ViSaGe, Cambridge Research System, Rochester, UK; at the University of Montreal, 20.5*11.5 inches, VIEWpixx 3D, VPixx Technologies, Montreal, Canada). Head movements were restricted with chin and forehead rests during the task. An eye-tracker, set in a binocular tower-mount, recorded eye movements (at CNRL: ViSaGe, Cambridge Research System, Rochester, UK, frequency: 250 Hz; at the University of Montreal: EyeLink 1000 Plus, SR Research, Kanata, Canada, frequency: 1000 Hz).
5
Visual and Auditory Perception Experiment
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Experiment 1 and Experiment 2 were conducted separately and on different days. In both experiments, after participants received an explanation of the experimental procedure, they signed an informed consent form. Participants were then seated in comfortable chairs with their chins fixed at a viewing distance of 60 cm, in a shielded dark room. Visual stimuli were displayed on a calibrated 24-inch LCD monitor (ViewPixx3D, VPixx Technologies). Auditory stimuli were presented through headphones (SoundTrue around-ear headphones, BOSE). All experiments were developed in Windows 10 and executed in MATLAB 2014b (MathWork Inc.) using Psychtoolbox 3 [31 (link)–33 ].
6
Receptive Field Mapping using VIEWPixx 3D
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Following preliminary qualitative mapping of the positions of several receptive fields on a tangent screen, a VIEWPixx 3D (VPixx Technologies, Saint-Bruno, Canada) was positioned at a viewing distance of 350 to 450 mm. This was done in such a way that the receptive fields obtained during the preliminary exploration were located around the center of the monitor. The stimuli were presented at a 120-Hz refresh rate using The Psychophysics Toolbox in MATLAB (43 (link)). Receptive fields were mapped at 1° resolution with both “on” (white) and “off” (black) squares flashed on a gray background. Squares appeared for 100 ms with a 50- to 100-ms (different in different cases) interstimulus interval.
7
High-Speed Visual Attention Experiment
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Testing occurred at the University of Montreal (Montreal, Canada). Participants sat 57 cm away from a high-speed computer screen (20.5*11.5 inches, VIEWpixx 3D; VPixx Technologies, Montreal, Canada) in a dark room. Head movements were restricted with chin and forehead rests during the task. An eye-tracker recorded eye movements (EyeLink 1000 Plus; SR Research, Kanata, Canada; frequency: 1000 Hz). Participants entered their responses on a keyboard placed in front of them, which was illuminated by a lamp oriented such that it did not interfere with screen readability.
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