The invention relates to systems and methods for testing vestibular and oculomotor function. A video sequence of said motion is acquired with a camera and still pictures are extracted from said video sequence. The Fourier currents are separated into active and non-active parts. A making-contact member brings the drive-member side contact part and the follower-member side contact part into contact with each other. The conduit system has an intake opening in fluid communication with the fluid inside the container and another portion in fluid communication with the intake of the nozzle. The calculation unit is configured to, after correcting a variation due to color change of the white reference plate with respect to the measurement value of the white reference plate, calculate the spectral reflectivity.