Method of estimating finger-tapping force

1. A method implemented via a hardware processor, for determining a finger-tapping force in a finger-tapping movement of two fingers of one of a subject's hands by using a bioinstrument device equipped with a set of distance sensors deriving an output relating to a distance between the two fingers, the finger tapping force being a pushing force of the two fingers upon making contact with each other,

the method comprising:

measuring stiffness characteristics of finger pulps of said two fingers by using the distance sensors and a force sensor as the subject pinches the force sensor with said two sensors;

estimating a stiffness function of the finger pulps;

registering the stiffness function in a storage unit;

obtaining a transitional change of the output of the distance sensors along a test period while the subject keeps on tapping said fingers;

extracting information indicative of a sum of displacements of the two fingers in a deformed state within the finger tapping movement, from the transitional change of the output of the distance sensors; and

determining the finger-tapping force by using the information indicative of the sum of displacements and the finger pulps' stiffness function retrieved from the storage unit;

wherein at least one of the estimating, the registering, the obtaining, the extracting and the determining, are effected via the hardware processor.

2. The method for estimating the finger-tapping force as claimed in claim 1 , wherein the method uses the two different finger pulps' stiffness functions separately estimated and registered for opening the two fingers and closing the two fingers in the finger-tapping movement.

3. The method for estimating the finger-tapping force as claimed in claim 1 , wherein the finger pulps' stiffness function which is estimated in said estimating includes an exponential function.