Stimuli were presented on a Sony GDM-F520 CRT monitor driven by a ViSaGe MKII Stimulus Generator (Cambridge Research Systems) 1 . The experimental software was written using MATLAB 2012b (MathWorks) 2 and the CRS toolbox. Responses were recorded using a wireless CT6 Response Box and infrared receiver (Cambridge Research Systems). Participants used a chin rest, positioned at a 57 cm distance from the screen.
Visage mkii stimulus generator
Manufactured by Cambridge Research Systems
Sourced in United Kingdom
The ViSaGe MKII Stimulus Generator is a versatile laboratory equipment designed for visual research applications. It is capable of generating a wide range of visual stimuli, including high-contrast patterns, color-defined images, and dynamic visual scenes. The device provides precise control over various stimulus parameters, such as size, contrast, and temporal characteristics, allowing researchers to accurately present stimuli for their experiments.
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8 protocols using visage mkii stimulus generator
1
Visual Stimuli Presentation and Response Recording
2
Contrast Perception Grating Presentation
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Stationary horizontal gratings were generated by MATLAB, alternating in counterphase with saturating contrasts and spatial frequencies (90% and 0.05 cycle/degree, respectively; temporal frequency 0.25 Hz) on a calibrated monitor (ViSaGe MKII Stimulus Generator [Cambridge Research Systems Ltd.] with a CRT monitor HP P1230 and a refresh rate of 140 Hz) positioned 25 cm from the contralateral eye.
3
OLED Display Comparison of Visual Stimuli
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All stimuli were displayed on a gamma-corrected, 25” organic light-emitting diode (OLED) display (Sony PVM-A250 Trimaster El, resolution 1920 × 1080 pixels, frame rate 60 Hz, refresh rate 120 Hz), driven by a ViSaGe MKII Stimulus Generator (Cambridge Research Systems, Rochester, UK). Experiments were programmed in MATLAB (2014b, The MathWorks, Inc., Natick, MA), using the ‘CRS’ toolbox. A uniform background luminance of 10 cd/m² was used.
In order to directly compare the performance of each stimulus form, all stimulus steps were converted to a common scale with identical units (energy = increment luminance x duration x area, units: cd/m2.s.deg2). Step sizes were approximately equal, in terms of log energy, across stimulus forms, and with a common reference value.
Four visual field locations were tested, 9.9° from fixation along the 45°, 135°, 225° and 315° meridians. The four different stimulus forms compared in this study, varied in the following parameters during experiments:
In order to directly compare the performance of each stimulus form, all stimulus steps were converted to a common scale with identical units (energy = increment luminance x duration x area, units: cd/m2.s.deg2). Step sizes were approximately equal, in terms of log energy, across stimulus forms, and with a common reference value.
Four visual field locations were tested, 9.9° from fixation along the 45°, 135°, 225° and 315° meridians. The four different stimulus forms compared in this study, varied in the following parameters during experiments:
4
Binocular Perception in Controlled Lighting
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The experiments were conducted in a dark room; that is, all the light in the room was from the monitor's screen, and the walls were black to avoid interreflections. Stimuli were presented on a calibrated LCD Display++ monitor (Cambridge Research Systems, Ltd.) at 100 Hz, with pixels resolution, and subtending visual degrees. The stimuli was viewed binocularly (subject's head was not constrained) from a distance of approximately 134 cm. We used the Cambridge Research Systems ViSaGe MKII Stimulus Generator, capable of displaying 14-bit color depth. The monitor was calibrated via the customary software (Cambridge Research Systems, Ltd.) and the Display++ monitor embedded colorimeter. The subject's responses were collected using a Logitec gamepad.
5
Memory Encoding and Retrieval Task Protocol
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Upon arrival, participants were presented with general information about the study, followed by the completion of the German version of the following questionnaires: a demographic survey and the Edinburgh Handedness Inventory51 (link). As a next step, the EEG cap was set and subjects were led into the sound-attenuated, electrically shielded, and dimly lit EEG laboratory.
The experiment was performed on a 22-inch CRT monitor (100 Hz; 1024 × 768 pixels), with a viewing distance of approximately 145 cm. The task was realized in Lazarus IDE (Free Pascal) and presented using ViSaGe MKII Stimulus Generator (Cambridge Research Systems, Rochester, UK). The eLTM task included a short training and three phases: encoding, distractor, and retrieval phase. Once the task was finalized, subjects completed a follow-up questionnaire, in which they were asked about the strategy they used and difficulties they encountered while completing the experiment. The whole session lasted between 3 and 3.5 h.
The experiment was performed on a 22-inch CRT monitor (100 Hz; 1024 × 768 pixels), with a viewing distance of approximately 145 cm. The task was realized in Lazarus IDE (Free Pascal) and presented using ViSaGe MKII Stimulus Generator (Cambridge Research Systems, Rochester, UK). The eLTM task included a short training and three phases: encoding, distractor, and retrieval phase. Once the task was finalized, subjects completed a follow-up questionnaire, in which they were asked about the strategy they used and difficulties they encountered while completing the experiment. The whole session lasted between 3 and 3.5 h.
6
Visual Stimulus Presentation via Mirror Stereoscope
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In a dimly lit room, a ViSaGe MKII Stimulus Generator (Cambridge Research Systems, Rochester, UK) with a 14-bit gray-level resolution was used to present the stimuli on a CRT video monitor (RDF223H; Mitsubishi, Tokyo, Japan). The display resolution was 800 × 600 pixels, with a refresh rate of 100 Hz. The observers viewed the screen using a mirror stereoscope (Chuo Precision Industrial, Tokyo, Japan). The presentation area subtended a 13° × 13° arc in each eye. The viewing distance was 57 cm.
7
Controlled Binocular Visual Perception
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All experiments were conducted in a dark room, on a calibrated 21 SONY GDM-F500R CRT monitor (1024 × 768 px, 100Hz) with a viewable image size of 19.8 . The display was viewed binocularly and freely from an approximate distance of 132 cm, subtending around 17.3 × 13.0 deg of visual angle for the observer. The monitor was connected to a Wildcat Realizm R500 PCI Express graphics card through a digital video processor (Cambridge Research Systems ViSaGe MKII Stimulus Generator) capable of displaying 14-bit color depths. The monitor was calibrated via a customary software for the stimulus generator (Cambridge Research Systems, Ltd., Rochester, UK) and a ColorCal (Minolta sensor) suction-cup colorimeter.
8
Encoding, Retrieval, and EEG in Memory Task
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Upon arrival, participants were presented with general information about the study, followed by the completion of the German version of the following questionnaires: a demographic survey and the Edinburgh Handedness Inventory 49 . As a next step, the EEG cap was set and subjects were led into the sound-attenuated, electrically shielded, and dimly lit EEG laboratory.
The experiment was performed on a 22-inch CRT monitor (100 Hz; 1024 x 768 pixels), with a viewing distance of approximately 145 cm. The task was realized in Lazarus IDE (Free Pascal) and presented using ViSaGe MKII Stimulus Generator (Cambridge Research Systems, Rochester, UK). The eLTM task included a short training and three phases: encoding, distractor, and retrieval phase. Once the task was finalized, subjects completed a follow-up questionnaire, in which they were asked about the strategy they used and difficulties they encountered while completing the experiment. The whole session lasted between 3 and 3.5 hours.
The experiment was performed on a 22-inch CRT monitor (100 Hz; 1024 x 768 pixels), with a viewing distance of approximately 145 cm. The task was realized in Lazarus IDE (Free Pascal) and presented using ViSaGe MKII Stimulus Generator (Cambridge Research Systems, Rochester, UK). The eLTM task included a short training and three phases: encoding, distractor, and retrieval phase. Once the task was finalized, subjects completed a follow-up questionnaire, in which they were asked about the strategy they used and difficulties they encountered while completing the experiment. The whole session lasted between 3 and 3.5 hours.
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