Viewpixx display

Manufactured by VPixx Technologies

Sourced in Canada

The VIEWPixx display is a high-performance laboratory equipment product developed by VPixx Technologies. It is designed to provide accurate and reliable visual stimulation for research and experimental purposes. The VIEWPixx display features a high-resolution LCD screen with a fast response time, ensuring precise and controlled visual presentation.

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Lab products found in correlation

Matlab, by MathWorks (4 mentions) Eyelink 1000, by SR Research (4 mentions) Psychtoolbox, by MathWorks (1 mentions) Propixx projector, by VPixx Technologies (1 mentions)

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ViewPixx 3D display (5 citations)

6 protocols using viewpixx display

Comparative Visual Perception Across Species

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Macaque and human participants were seated 57 cm away from a 150 cm × 86 cm rear-projection screen (IRUS; Draper Inc.) covering the central

106 °

73 °

of visual angle. Images were projected onto the screen by a PROPixx projector (VPixx Technologies Inc.) driven at a resolution of 1,920 × 1,080 pixels at 120 Hz. Marmoset viewing distance was 28.5 cm from a 52 cm × 29 cm ViewPixx display (VPixx Technologies Inc.) covering the central

85 °

54 °

of visual angle. Eye movements in all species were recorded with head fixed (M1, M2, C; head post) or head stabilized (H; chin and forehead rest) at 1 kHz using an Eyelink 1000 eye tracker (SR Research Ltd.).
Visual stimuli were generated by a Mac Pro-6.1 (H, M1, M2) or 5.1 (C) (Apple Inc.) using Matlab (MathWorks), Psychtoolbox (26 ), and version 4 of PLDAPS (27 ). Stimulus code is stored in an online repository, and data are stored on a local server.

Knöll J., Pillow J.W, & Huk A.C. (2018). Lawful tracking of visual motion in humans, macaques, and marmosets in a naturalistic, continuous, and untrained behavioral context. Proceedings of the National Academy of Sciences of the United States of America, 115(44), E10486-E10494.

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Object-Image Stimulus Set Protocol

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On hundred five images of three object categories (face, bottle, and house) were taken from an object–image stimulus set (Rice et al., 2014 (link)). All images were grayscale, were superimposed on a middle gray background, and had a resolution of 400 × 400 pixels (Fig. 1). For each of these original images, two different phase-scrambled versions were generated. A global-scrambling method involved a typical Fourier scramble (i.e., keeping the global power of each two-dimensional frequency component constant while randomizing the phase of the components). A local-scrambling method involved windowing the original image into an 8 × 8 grid and applying the phase scramble to each 50 × 50 pixel window independently. In a previous study (Coggan et al., 2016 (link)), we showed that these scrambling methods effectively remove any semantic or categorical content in the images. Stimuli were presented using a gamma-corrected VIEWPixx display (VPixx Technologies) with a resolution of 1920 × 1200 pixels and a refresh rate of 120 Hz. Images were viewed at a distance of ∼57 cm and subtended a retinal angle of 8°.

Coggan D.D., Baker D.H, & Andrews T.J. (2016). The Role of Visual and Semantic Properties in the Emergence of Category-Specific Patterns of Neural Response in the Human Brain. eNeuro, 3(4), ENEURO.0158-16.2016.

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Primate Attention Task in Darkened Booth

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Animals were seated and head-fixed in a primate chair (Crist Instrument Inc., Hagerstown, MD, and custom-built) inside a darkened booth at a distance of 48 cm from a VIEWPixx display (VPixx Technologies, Saint-Bruno, QC Canada) with a 1920 x 1200 resolution (~ 60° x 38°) and 100Hz frame-rate. Stimuli were presented on the VIEWPixx display that was controlled by a mid-2010 Mac Pro (Apple Inc., Cupertino, CA) running MATLAB (The Mathworks, Natick, MA) with the Psychophysics Toolbox extensions (Brainard, 1997 (link)). The background luminance of the screen across all tasks was 14 cd/m². Eye position was recorded using an EyeLink 1000 infrared eye-tracking system (SR Research Ltd., Ottowa, Ontario, Canada); this signal was monitored online to ensure strict fixation within a 2° fixation window during all tasks. The primate chairs were equipped with a single axis joystick (CH Products, model HFX-10) that the monkeys used to report relevant stimulus changes during the attention task. Joystick presses and releases were detected by a change in voltage signal. All experiments were controlled using a modified version of PLDAPS (Eastman and Huk, 2012 ).

Bogadhi A.R., Katz L.N., Bollimunta A., Leopold D.A, & Krauzlis R.J. (2020). Midbrain activity shapes high-level visual properties in primate temporal cortex. Neuron, 109(4), 690-699.e5.

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Visual Perception and Eye Tracking Protocol

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The stimuli were presented on a VIEWPixx display (VPixx Technologies Inc., Saint-Bruno-de-Montarville, QC, Canada) at 100 Hz refresh rate. Participants sat at 92 cm distance from the display and the viewing area subtended 29.5° × 18.8° (display resolution 1920 × 1200 pixels). Participants' head was placed in a chin and forehead support. Experiments were conducted in a dimly lit room. The participants' eye movements were tracked with an EyeLink 1000 (SR Research Ltd., Ottawa, ON, Canada) eye-tracker.

Salmela V.R., Ölander K., Muukkonen I, & Bays P.M. (2019). Recall of facial expressions and simple orientations reveals competition for resources at multiple levels of the visual hierarchy. Journal of Vision, 19(3), 8.

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Primate Eye-Tracking Behavioral Experiment

Cited 1 time

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Animals were seated and head-fixed in a primate chair (Crist instrument Inc) inside a darkened booth facing a 100 Hz VIEWPixx display (VPixx Technologies) that was controlled by a mid-2010 Mac Pro (Apple Inc) running MATLAB (The Mathworks) with the Psychophysics Toolbox extensions^{69 (link)}. Eye position was recorded using an EyeLink 1000 infrared eye-tracking system (SR Research Ltd.) and monitored online for gaze-contingent progression through the task. Experiments were controlled using a modified version of PLDAPS^{70 (link)}.

Katz L.N., Yu G., Herman J.P, & Krauzlis R.J. (2023). Correlated variability in primate superior colliculus depends on functional class. Communications Biology, 6, 540.

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Primate Eye Movement Tracking

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Animals were seated and head-fixed in a primate chair (Crist instrument Inc) inside a darkened booth facing a VIEWPixx display (VPixx Technologies) that was controlled by a mid-2010 Mac Pro (Apple Inc) running MATLAB (The Mathworks) with the Psychophysics Toolbox extensions (Brainard, 1997) . Eye position was recorded using an EyeLink 1000 infrared eyetracking system (SR Research Ltd.) and monitored online for gaze-contingent progression through the task. Experiments were controlled using a modified version of PLDAPS (Eastman and Huk, 2012) .

Katz L.N., Yu G., Herman J.P., & Krauzlis R.J. (2021). Correlated variability in primate superior colliculus depends on functional class.

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