Vibrogram, a graphical curve showing the vibration sensibility relative to a normative age-matched reference. A vibrogram is recorded with a VibroSense Meter, which investigates the Vibrotactile Perception Thresholds (VPT) of the hand at multiple frequencies between 8 to 500 Hz, so-called Multi-frequency Tactilometry.
The multifrequency concept is based on the fact that different mechanoreceptors of the skin respond to different frequencies. Assessing the perception of vibration with only one frequency is, in other words, not sufficient in order to get a full picture of the ability to sense vibrations.
The investigation results in a vibrogram that normally has a characteristic shape. An impaired sense of vibration is associated with different changes to the shape. For each investigation, an age-matched normal vibrogram with standard deviations appears on the screen. Thus, the patient’s recorded vibrogram can easily be compared with a normal vibrogram, for example against normative age-matched thresholds.