The MMF paradigm consisted of three blocks of repeated standard tones (50 ms, 1000 Hz, 85% of stimuli) randomly interrupted by 60 duration deviants (100 ms, 1000 Hz, 15% of stimuli). The inter-stimulus interval was 500 ms and each block lasted 4–5 min. MMF paradigm blocks were presented between stimulus blocks of an attention-directed auditory paradigm not discussed herein. Stimuli were created using VPixx version 3.0 with DataPixx (VPixx Technologies Inc., 2016 ) and calibrated with a Jay Cam sound pressure level meter to 85 dB SPL. Tones were presented binaurally through Etymotic headphones. During the MMF blocks, participants watched a silent landscapes film. The MMF paradigm adhered to the recommendations of Duncan et al. (2009) (link).
Datapixx
Manufactured by VPixx Technologies
The DATAPixx is a high-performance data acquisition and stimulus presentation device designed for laboratory research. It provides reliable and precise data collection and stimulus control capabilities. The core function of the DATAPixx is to serve as an interface between experimental equipment and a computer, enabling researchers to acquire and manipulate data in a controlled and organized manner.
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3 protocols using datapixx
1
MMF Paradigm for Auditory Attention Research
2
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.
3
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.
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