USE3 Physiolab Software Guide - J&J Engineering Biofeedback ...

Physiolab Software Guide 40
MAN vs. AUTO Threshold Mode
If “MAN” is selected, the up/down arrows to the right of the signal can be used to
manually increase or decrease the threshold value. You can manipulate the
threshold according to the client’s signal amplitude to achieve a desired success
average.
If AUTO is selected then the up/down arrows to the right adjust the desired
success rate percentage and USE3 Physiolab adjusts the thresholds to enable
the client to achieve this target success rate. If Inhibit is selected, the success
percentage needs to be set much higher than if Reinforce is selected in order to
compensate for the dropout delay.
Be sure that the yellow score bar at the bottom of the screen is moving. If it isn’t
moving, you need to readjust the threshold controls appropriately for the client so
that a reasonable success percentage is being achieved.
Threshold Average and Peak Average
At the bottom of the EEG setup screen two control functions called Threshold
Average and Peak Average.
The up-down buttons to the left of the “Thr Avg” changes the AUTO Threshold
update rate. Altering the Threshold Average changes how frequently in seconds
the AUTO threshold is re-calculated.
The up-down buttons to the left of the “Peak Avg” label increase or decrease the
averaging function (smoothing ) of all signals.
Types of EEG Feedback
The EEG applications are set up to do two different types of feedback with
different audio feedback and display options for each type.
The first is traditional threshold-driven continuous reinforcement with feedback
consisting of MIDI synthesizer music, recorded voice or music WAV files, Media
Player video files or music CDs. This type of feedback is controlled using the
Sound Select window described in the Audio Features section. To control
feedback you can use individual bands or you can combine all bands that are
turned on into one signal (called “yoked thresholds”) by selecting “Audio All Thr
Tune” or “All Bands”. This type of continuously running feedback is turned on
when all thresholds are grey or green and feedback turned off when any
threshold turns red.
The second type of feedback is response-reward-timeout feedback with a
beginning, discreet steps, and an end, which is a reward period after a fixed
number of steps. Progress is measured in rewards per minute. Rewards consist