Research Areas


Electrovestibulography (EVestG) Experiments

EvestG is a new vestibular driven test that measures spontaneous and driven field potential activity recorded in the external ear canal in response to vestibular stimuli. The EVestG test is similar to electrocochleography with the acoustic input replaced by a series of orthogonal tilts.

The EVestG signal is recorded during dynamic and static phases via an electrode resting proximal to the tympanic membrane [6,7]. The electrodes are simply and painlessly positioned and rested close to the left and right ear drums of the subject. Figures 2 and 3 show the recording system with the hydraulic chair.

EVestG technology has been applied towards diagnosis of and separation of Parkinson disease (PD) / Schizophrenia / Depression (Unipolar vrs Bipolar) / Meniere's Disease / Controls [6-19]. Sensitivities and specificities so far have been typically above 85%.

Here is a short video clip showing how EVestG signal is recorded in our lab at Riverview Health Center.

If you like to read more news about EVestG, you may read on the RHC newsletter (second page) and in this Radio Interview.

Some of our related publications using EVestG are:

  1. Dastgheib Z., Lithgow B., and Moussavi Z., "Diagnosis of Parkinson's Disease using Electrovestibulography", Med Biol Eng Comp, in press (DOI: 10.1007/s11517-012-0890-z), 2012.
  2. Kumaragamage C., Lithgow B and Moussavi Z., "A portable biological amplifier for electrovestibulography", Design of Medical Devices Conf., April 2012.
  3. Lithgow, B.J. and Moussavi, Z., “Dementia and EVestG”, 3rd World Congress of Asian Psychiatry,  Melbourne, Australia, August 2011.
  4. Dastgheib Z., Lithgow B. and Moussavi Z., "Application of fractal dimension on vestibular response singles for diagnostic of Parkinson Disease," Proc IEEE EMBS conf., Sept. 2011.