A new portable equipment with detection of response time and
psychophysical conditions in normal and exceptional environments also with
virtual reality measurements with a fuzzy-based control system. It may be
adopted for earth and space applications, because of its portability, in
order to measure all the reactions in front of external effects.
The external effects require 1)
the response to soundsand a soft touch of a button, 2) the touch of the
finger in front of a virtual reality drawing of the finger itself, 3)
pronouncing a word. The equipment is able to measure the reaction time of
the person. The system obtains such goal using the following
- - Fast Movement: starting from a
fixed point of initial reference, the person must use the index finger
to touch as fast as possible the target which measures the impressed
force; in parallel, other parameters are measured, as the angular
position, the speed of finger and the time of reaction.
- - Movement with Virtual control:
the person looks at a virtual image on a graphical display of his own
finger and when he touches real target, then the virtual one changes
color indicating that it has been caught up and this is the end of the
The other parameters are acquired
from the button and these are: reaction time (defined as the delay time
from acoustic signal of buzzer to the starting of pressure), speed
(calculated from the starting point to the end point of button race) and
force (by using a strain gauge).
The block (1) is the press
button. This is the input patient interface and its function is to capture
indirectly three basic information for diagnosis: the response time, the
speed and the pressure of the fingertip. Effectively, it captures the
start time of button pressure, the end time and the force impressed by
using a strain gauge.The analog force signal is first amplified in block
(2), after it is filtered by block (3) and then converted in a 8-bit
digital form by block (4). All these three information are collected from
block (6) which is the heart of the system and directs the informations
flow among peripherals. Blocks (5,8) represents the medical operator
interface to give commands and to read outputs. The block (6) manages all
informations and stores them in block (11) if it is necessary. Tremor is
also caught up by a very cheap switch accelerometer called “Tremor
Sensor”. The block (10) performs fuzzy rules on acquired data and return
diagnosis results that will be output on display (5). The audio unit,
composed by a simple buzzer, is used to synchronize the patient actions in
relation to the kind of test.
Ability of transferring diagnosis through a
remote communication interface in order to monitor daily the state of
health of a patient.
The system is an intelligent-machine based on
soft computing techniques. Its efficiency can be improved considering more
examples for membership function calibration or, moreover, improving the
response correctness by using a self learning technique.