Certus

Manufactured by Northern Digital

The Certus is a high-precision tracking system designed for use in a variety of laboratory and research applications. It utilizes electromagnetic tracking technology to accurately monitor the position and orientation of objects within a defined working volume. The Certus system is capable of providing real-time data on the movement and location of tracked devices, enabling researchers and scientists to collect valuable spatial information for their studies.

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Lab products found in correlation

Labview, by National Instruments (1 mentions) Optotrak 3020, by Northern Digital (1 mentions)

Close spelling variants of this product

Optotrak Certus Optotrak Certus cameras Optotrak Certus motion analysis system

2 protocols using certus

Reach Tracking with Infrared Motion Capture

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An infrared motion-tracking camera (Optotrak Certus, Northern Digital) is used to track the reaching movement. Infrared-emitting diodes (IREDs) are taped to the tip of the right and left index fingers of each participant to track the reach in each hand. The Optotrak samples the IRED’s 3D position at 100 Hz throughout each 2000 ms trial. The task is controlled by custom software written in LabView (National Instruments) programming environment. The stimuli and apparatus reported here are specific to UoE. At the second site, UEA, motion tracking was performed by using a Qualisys system (Gothenburg, Sweden) and a slightly different set up was used. 14 (link)
Participants are seated with their head placed in a chin-rest in line with the middle of the display. Stimuli are back-projected via a mirror onto a screen (1000 mm wide × 750 mm deep) that lies flat in-front of the participant. A webcam is placed on the screen 50 cm directly in-front of the participant, as a fixation point. The live webcam image feeds into a separate laptop, allowing the experimenter to monitor gaze. A start button is aligned to the centre of the screen, positioned 10 cm in-front of the participant, 40 cm away from fixation (figure 2). Targets are white circles (diameter=1.60°, 13.96 mm) presented at four eccentric locations (11.4°, 22.6°, 33.4° and 43.6° away from centre) on each side (figure 2).

Mitchell A.G., McIntosh R.D., Rossit S., Hornberger M, & Pal S. (2020). Assessment of visually guided reaching in prodromal Alzheimer’s disease: a cross-sectional study protocol. BMJ Open, 10(6), e035021.

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Quantifying Peak Hand Aperture during Reaching

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To quantify peak aperture in experiment 1 and 2, we recorded displacements between the first finger and thumb using two optical motion analysis systems (Optotrak 3020 and Certus; Northern Digital, Waterloo, Ontario), with resolutions of 0.1mm. Infrared LEDs were attached securely to the first finger nail and thumbnail. Kinematic data were collected at 100 Hz and interpolated to 2.5 kHz to match the sampling rate of the electromyography (EMG) system. Post-hoc analyses were performed on trials having markers with >95% visibility. We removed trials if 1) aperture was not calculable during active reaching, 2) no response to the go-signal was detected, 3) a detectable touch signal was not received indicating the ball was not displaced, and/or 4) peak aperture value was an outlier. Outliers were defined as values greater than 2.7 standard deviations above or below the mean for each subject and ball size. Based on these criteria, approximately 1% of trials were deemed unusable. Maximum hand aperture (experiment 1) was defined as the greatest distance between the finger and thumb during maximum voluntary hand opening (Jeannerod 1981 ; Haggard and Wing 1998 (link)). Similarly, peak hand aperture during reaching (experiment 2) was defined as the greatest distance between the finger and the thumb occurring between the onset of movement and within 90% of the reach time.

Stahl V., Hayes H.B., Buetefisch C., Wolf S.L, & Trumbower R.D. (2014). Modulation of hand aperture during reaching in persons with incomplete cervical spinal cord injury. Experimental brain research, 233(3), 871-884.

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