Multiscan g520

Visual stimuli were generated by a custom-developed software using LabView (National Instruments) and MatLab (Mathworks), and were presented on a 20-inch cathode ray tube (CRT) monitor (Sony Multiscan G520; 30.5 × 30.5 cm; refresh rate, 60 Hz; maximum luminance, 80cd/m²), as described in our previous studies (Chen et al., 2014 (link), 2017 (link); He et al., 2014 ). The CRT monitor was placed 20 cm away in front of the mouse, subtending 80° ×80° of the visual field. Full-screen drifting sinusoidal gratings in 12 different directions (spatial frequency, 0.02 Hz/degree; temporal frequency, 2 Hz) were used to measure the orientation-tuned spiking responses to stimuli in individual recorded neuron. Each stimulation trial consisted of 1 s of blank screen and 3 s of drifting gratings, repeated for 4 times, in which stimulus orientations and directions were randomized.

Subjects were seated in a dark room with their heads restrained on a stable chin rest. All visual stimuli were displayed on a 21-inch CRT monitor (Sony Multiscan G520, 1280 × 960 resolution, 100 Hz refresh rate), positioned 57 cm in front of the subjects. Eye position was monitored using an infrared image eye tracker (Eyelink 1000 desktop mount, SR Research). During the experiments, subjects’ mid-sagittal plane was aligned with the midline of the CRT screen. Stimulus presentation and behavioral data collection was controlled by MATLAB (MathWorks) with Psychtoolbox running on a PC.
To minimize the possible influence of surrounding objects on task performance, all experiments were carried out in an extremely dark environment. The background luminance of the monitor was set to dark. All light-producing components of the apparatus (e.g., the dim light on the keyboard and the power buttons of the computer), were covered with black paper. Thus, during the experiments, subjects could not see the edge of the monitor.

Stimuli were displayed on a 21-in. CRT monitor (SONY Multiscan G520) with a resolution of 1024 × 768 pixels and a 150-Hz refresh rate. All characters were rendered in Song 20 font. The presentation was controlled by an OpenGL-based Psychophysics Toolbox 3 (Brainard, 1997 (link); Kleiner et al., 2007 (link)), which incorporates the EyeLink Toolbox extensions (Cornelissen et al., 2002 (link)) in Matlab (2013a). Using this configuration, display changes can be controlled precisely and require ~10 ms to complete. Eye movements were recorded using a SR-Research Eyelink 1000 eye tracker (upgraded to 2000 Hz; Kanata, ON, Canada) sampling at a 1000-Hz rate. Participants were seated 58 cm from the monitor. At this distance, one character subtended ~1° of the visual angle. A chin rest was used to minimize head movements. Viewing was binocular, but only the right eye was recorded.

Our unisensory training was designed with the same timing structure as the multisensory training in this study but contained only visual stimuli (visual flashes), which had to be judged regarding their synchronicity. Visual stimuli (4 deg. of visual angle) were presented 4 deg. of visual angel underneath and above the fixation mark. There were 120 trials presented pseudorandomly in the training phase (60 times SOA 0 ms condition and 10 times each other SOA condition).
Considering the findings of Powers et al. (2009) (link) as well as Stevenson et al. (2013) (link), who demonstrated the necessity of feedback for inducing long-lasting changes in the TBW, we decided to use feedback for our subjects regarding the synchronicity of the stimuli within the SJT training units. Both, the unisensory and multisensory training had duration of approximately four to 5 min depending on the response times of the participants.
All stimuli were presented binaural via loudspeakers placed beside of a high refresh rate monitor (Sony Multiscan G520, 120 Hz) placed in a quiet room approximately 60 cm in front of the subjects. All auditory stimuli were presented at individual subjective level of good audibility. Presentation software (Neurobehavioral Systems, Inc., Albany, CA, United States, version 14.9) was used to control all experiments and collect data.

Eye movements were recorded using an EyeLink 1000 tracker (SR Research, Mississauga, Ontario, Canada). Experimental materials were presented on a 21-in. CRT monitor (Sony Multiscan G520) with a 1,024 × 768 pixels resolution and a refresh rate of 150 Hz. The eye-tracking system was sampled at 1000 Hz. The participants placed their chins on a chin-rest and leaned their foreheads on a forehead rest to minimize head movements. Although viewing was binocular, eye movement data were collected only from the right eye. Participants were seated 58 cm from the video monitor.