Experimental control was performed using the REC-GUI software (RRID:SCR_019008).59 (link) Stimuli were rear projected onto a polarization preserving screen (Screen-Tech e.K.) using a DLP LED projector (PROPixx; VPixx Technologies, Inc.) with a resolution of 1920 × 1080 pixels (58° × 35°) at 120 Hz. The screen was 57 cm from the monkey. Polarized glasses were worn. A phototransistor circuit was used to confirm the synchronization of the left- and right-eye images, and to align neuronal responses to the stimulus onset. The stimuli were created in MATLAB R2015a using Psychtoolbox 360 and rendered with anti-aliasing using an NVIDIA 1080T graphics card on a Linux workstation. Eye tracking was performed at 1,000 Hz (EyeLink 1000 plus, SR Research).
Propixx
Manufactured by VPixx Technologies
Sourced in Canada
The PROPixx is a high-performance display device for vision research applications. It features a fast refresh rate, high resolution, and accurate color reproduction, making it suitable for a wide range of vision experiments and studies.
Automatically generated - may contain errors
Lab products found in correlation
Eyelink 1000 plus, by SR Research (4 mentions)
Geforce gtx 970, by NVIDIA (3 mentions)
Datapixx, by VPixx Technologies (2 mentions)
Psychophysics toolbox version 3, by MathWorks (1 mentions)
Matlab 8, by MathWorks (1 mentions)
Matlab r2015b, by MathWorks (1 mentions)
Matlab 2012b, by MathWorks (1 mentions)
10 protocols using propixx
1
Stereoscopic Visual Stimuli Presentation
2
Visual Stimuli Presentation and Eye Tracking Protocol
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Visual stimuli were presented using a LED projector, back-projected on a rear-projection screen that was positioned at a distance of 52 cm from the animal’s eyes (PROPixx, VPixx Technologies, Saint-Bruno, Canada). The MonkeyLogic software package developed in MATLAB (https://www.brown.edu/Research/monkeylogic/ ; https://monkeylogic.nimh.nih.gov/ ; Hwang et al., 2019 (link)) was used for stimulus presentation, behavioral control and recording of eye position. A photodiode was used to measure stimulus timing. Eye position was continuously monitored with an infrared eye tracking system (ISCAN model ETL-200, Woburn, MA) and eye traces were saved using MonkeyLogic. Trials were aborted if eye position deviated from the fixation point (threshold typically 1 dva radius).
3
Visual Stimuli Presentation and Behavioral Monitoring in Primates
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Marmosets were trained to enter a custom-built marmoset chair that was placed inside a faraday box with an LCD monitor (ASUS VG248QE) at a distance of 40 cm. The monitor was set to a refresh rate of 100 Hz and gamma corrected with a mean gray luminance of 75 candelas/m2. For the macaques visual stimuli were presented using a LED projector, back-projected on a rear-projection screen that was positioned at a distance of 52 cm from the animal’s eyes (PROPixx, VPixx Technologies, Saint-Bruno, Canada). The marmosets and macaques were headfixed by a headpost for all recordings. Eye position was measured with an IScan CCD infrared camera. The MonkeyLogic software package developed in MATLAB (https://www.brown.edu/Research/monkeylogic/ ; https://monkeylogic.nimh.nih.gov/ ) (Asaad et al., 2013 (link)) was used for stimulus presentation, behavioral control, and recording of eye position. Digital and analog signals were coordinated through National Instrument DAQ cards (NI PCI6621) and BNC breakout boxes (NI BNC2090A).
4
Visual Stimuli Presentation for MEG Experiments
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Stimuli were generated using MATLAB 8.5 (The MathWorks) and Psychophysics Toolbox, version 3 (Brainard, 1997 (link); Pelli, 1997 (link)). A DLP projector (PROPixx; VPixx Technologies) showed the stimuli at a refresh rate of 120 Hz centered onto a translucent screen (25 horizontal × 16 vertical degrees of visual angle [DVA]). The screen was located in front of the participant (viewing distance, 125 cm) within the dimly lit, magnetically shielded MEG room. Stimulus timing was controlled with a data and video processing peripheral (DATAPixx; VPixx Technologies) and monitored via a photograph diode placed at the upper left corner of the projection screen. The delay between trigger and stimulation onset was corrected with this method.
5
Stereoscopic Visual Stimuli Presentation
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Experimental control was performed using the open-source REC-GUI software (RRID:SCR_019008; Kim et al., 2019 (link)). Stimuli were rendered using Psychtoolbox 3 (MATLAB R2016b; NVIDIA GeForce GTX 970). They were rear-projected onto a polarization preserving screen (Stewart Film Screen, Inc) using a DLP LED projector (PROPixx; VPixx Technologies, Inc) with 1280 × 720 pixel resolution (70° × 43°) at 240 Hz (120 Hz/eye). The screen was positioned 57 cm from the monkey. Polarized glasses were worn. A phototransistor circuit was used to confirm the synchronization of left and right eye images and to align neuronal responses to the stimulus onset. Eye positions were monitored optically at 1 kHz (EyeLink 1000 plus, SR Research).
6
Stereoscopic Stimulus Presentation and Eye Tracking
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Experimental control was performed using the REC-GUI software (RRID:SCR_019008 ) (Kim et al., 2019 (link)). Stimuli were rendered using Psychtoolbox 3 (MATLAB R2016b; NVIDIA GeForce GTX 970) and rear-projected onto a polarization preserving screen (Stewart Film Screen, Inc) using a DLP LED projector (PROPixx; VPixx Technologies, Inc) with 1280 × 720 pixel resolution (70° × 43° of visual angle) at 240 Hz. A circular polarizer was used to sequence the presentation of stereoscopic ‘half-images’ to each eye (120 Hz/eye). Polarized glasses were worn. A phototransistor circuit was used to confirm the synchronization of the left and right eye images as well as align neuronal responses to the stimulus onset. Eye tracking was performed optically at 1 kHz (EyeLink 1000 plus, SR Research). The monkeys sat 57 cm from the screen.
7
Visual Stimulus Presentation and Electrical Stimulation
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Stimuli used in the experiment comprised three distinct categories: animals, produce (i.e., fruits/vegetables), and tools. Thirty unique images from the three categories were obtained from multiple sources, either contributed by other researchers [12] (link) or freely available online [13, (link)14] (link) (www.pexels.com, www.unsplash.com). We avoided using potentially threatening images (e.g., knives/spiders) to lessen arousal-based effects.
The visual stimuli were presented with A Simple Framework [15] (link), built on the Psychophysics toolbox [16] (link) and MATLAB R2015b (Mathworks, Natick, USA), and cast onto a semitransparent screen behind participants using an LED projector (PROPixx, VPixx Technologies Inc., Saint Bruno, Canada) at a frame rate of 60 Hz and a resolution of 1024 × 768 pixels.
Electrical stimuli (duration = 2 ms) were delivered via a DS7A current stimulator (Digitimer Limited, Letchworth Garden City, UK), the timing of which was controlled by ASF and an Arduino® (Arduino SA, Chiasso, Switzerland).
The visual stimuli were presented with A Simple Framework [15] (link), built on the Psychophysics toolbox [16] (link) and MATLAB R2015b (Mathworks, Natick, USA), and cast onto a semitransparent screen behind participants using an LED projector (PROPixx, VPixx Technologies Inc., Saint Bruno, Canada) at a frame rate of 60 Hz and a resolution of 1024 × 768 pixels.
Electrical stimuli (duration = 2 ms) were delivered via a DS7A current stimulator (Digitimer Limited, Letchworth Garden City, UK), the timing of which was controlled by ASF and an Arduino® (Arduino SA, Chiasso, Switzerland).
8
Visual Stimuli Presentation and Eye Tracking Protocol
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Visual stimuli were presented using a LED projector (Propixx, VPixx Technologies) that displayed the images on a rear-projection screen (Stewart Filmscreen). Stimulus presentation and task were controlled by MonkeyLogic software (https://www.brown.edu/Research/monkeylogic/ ; https://monkeylogic.nimh.nih.gov/ ; 56 (link)). A photodiode was used to measure stimulus timing. Eye position was monitored and recorded using an infrared eye-tracking camera (ETL-200, ISCAN). Trials were aborted if eye position deviated from the fixation point (threshold typically 1 dva radius).
9
MEG Stimulus Presentation System
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Stimuli were generated using MATLAB 2012b (The MathWorks, Natick, MA, USA) and Psychophysics Toolbox 3 (Brainard, 1997 , Pelli, 1997) . A DLP projector (PROPixx; VPixx Technologies) showed the stimuli at a refresh rate of 120 Hz centered onto a translucent screen. The screen was located in front of the participant (viewing distance, 150 cm) within the dimly lit, magnetically shielded MEG room. Stimulus timing was controlled with a data and video processing peripheral (DATAPixx; VPixx Technologies) and monitored via a photo diode placed at the upper left corner of the projection screen. The delay between trigger and stimulation onset was corrected using the photodiode information.
10
Stereoscopic Visual Stimuli Presentation
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Experimental control was performed using the REC-GUI software (RRID:SCR_019008) (Kim et al., 2019) . Stimuli were rendered using Psychtoolbox 3 (MATLAB R2016b; NVIDIA GeForce GTX 970) and rear-projected onto a polarization preserving screen (Stewart Film Screen, Inc.) using a DLP LED projector (PROPixx; VPixx Technologies, Inc.) with 1,280 x 720 pixel resolution (70° x 43° of visual angle) at 240 Hz. A circular polarizer was used to sequence the presentation of stereoscopic 'half-images' to each eye (120 Hz/eye). Polarized glasses were worn. A phototransistor circuit was used to confirm the synchronization of the left and right eye images as well as align neuronal responses to the stimulus onset. Eye tracking was performed optically at 1 kHz (EyeLink 1000 plus, SR Research). The monkeys sat 57 cm from the screen.
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