Recording and analysis of upper limb movement

membre supérieur
Movement measurement is currently essentially carried out on post-stroke patients to quantify the motor deficit of the upper limbs and the recovery permitted by re-education over the course of a year. Movements are analyzed at the hand (opening and closing of the thumb-index finger pinch, extension-flexion of the index finger, closing-opening), wrist (extension-flexion), forearm (prono-supination), elbow (extension-flexion) and shoulder (extension-flexion, abduction). The equipment used is an ELITE 3D opto-electronic system: reflecting disks are placed on the subject's limbs following a model designed for the movement to be studied. They reflect the infrared radiation emitted by sources placed on the video cameras. 
mouvement continu
The radiation reflected by each disk is detected simultaneously by the cameras in the form of points, the spatial coordinates of which are recorded at a frequency of 100 Hz. These data can be converted into cinematic quantities such as trajectories, displacements, velocities and accelerations or can display joint movement in three spatial planes.
This technique can be used to study any other movement except walking, which is not permitted by the size of the room used at present.  The difficulty of making the recordings and the analysis time varies greatly according to the model and the study in question.

All requests from within the IFR or from outside must thus be given careful study.

Manager :
Robert Darmana (IE Inserm,

Recording and analysis of eye movements

Oculometer adapted for MRI environments

The technical facility includes an MRI-compatible monocular oculometer (ASL model E6000 - Immersion) with the optics offset by a mirror system. It has an accuracy of 0.5° and a resolution of 0.25°. The sampling rate is 60 / 120 / 240 Hz. The distance of use is 3.50 m max. Long focal length optics send the image of the eye to a 25-cm-diameter antenna. The system has the «Eyepos» software for research, calibration, and image display and recording operations; Eyenal data analysis software; Fixplot software for superimposing eye direction trajectories; and SDK (software development kit), which integrates head movement and eye path data into other applications like C++, Matlab, and Presentation

Oculometers not suitable for MRI

    • CHRONOS (Space room)
Chronos system based on the digital recording of  binocular images with a video camera, and their storage (CMOS technology). Oculometer with monocular and binocular configuration available in the "space room", not MRI compatible. Cameras on headsets and dichroic mirrors, with IR LEDs (940 nm). Sampling rate is 50, 100 or 200 Hz. Analysis is done off-line using the recorded files. It combines horizontal, vertical and twisting movements. Accuracy 0.2° and resolution of the order of 0.05°.


    • ISCAN (CerCo)
IR-illuminated video recording system. Exists in human and non-human primate versions (monocular or binocular). Resolution 0.06°, sampling rate up to 240 Hz.


    • SMI (CerCo):
Based on video image processing technology (IR camera and illumination). Sampling rate 240/350 Hz (up to 2005 version) and 500/1250 Hz (2006 version). Head held at chin and forehead. Pupil tracking technique. This monocular oculometer equipped with an infrared camera works in real time and can record data extremely precisely, in both space and time. Numerous adjustable settings (contrast, brightness, pupil diameter, etc) enable the pupil to be located quickly and in a very stable way.

In CerCo, this oculometer is interfaced with the Matlab PsychToolBox extension, which allows the eye movement recordings to be checked in real time and visual stimuli to be presented rapidly in a controlled manner.

The Iview software also provides post-hoc processing of eye movements by decomposing the eye position signal into events (saccades, fixations, blinks) with precise analysis of the saccade latency and the image point targeted by the saccade