Hemoencephalography (HEG) Designs
*** THIS PRODUCT HAS BEEN WITHDRAWN FROM SALE. ***
A set of 9 designs developed and tested using a Pocket Neurobics Pendant (nIR).
- Dual screen designs (therapist and client) included.
- Automatic calculation of baseline and gain over baseline.
- Use of training periods: a button begins a timed period of training, at the end
of which the client's feedback is switched off, allowing rest, but the trainer
can continue to monitor the signal, change thresholds etc. The length of
training period can be easily changed. At the end of the session the overall
pattern can be clearly visualised - see trend below. The gain over each training period
Graphical Feedback Features
- 60 S trend displaying rate of change
- long term trend (15 min), showing training periods (green blocks in lower graph)
Audio Feedback Features
- Tone feedback via pitch (with button control)
- Auto-recalibrate feature: when pitch drifts out of range, it automatically
resets to the middle of the pitch range
- Sensitivity can be easily adjusted
- Rate of change feedback via volume - sound goes quiet when the signal
is stable/unchanging (with button control)
Forward motion of the video is produced by increases in the HEG signal. Motion is
controlled - speed increases in proportion to the rate of change of the signal
(up to a maximum which is not too fast). When the HEG signal decreases, the
video remains still, or there is an option to allow backward movement (button
controlled). There is related audio feedback.
Reading Design: this uses text converted to video format. Buttons are used to
page forward and back (progressing through frames of the video). When the HEG
signal drops, the text fades out to a white background. The trainee must
increase the signal to resume reading - in other words task based training.
Again feedback is controlled by the rate of change of the HEG signal - this time
as negative feedback. When the HEG signal decrease, picture and sound quality is
degraded. The trainee must increase the signal again to recover the picture.
Click on the thumbnail to see the full-scale image.
1. HEG Design
The uppermost trend shows the rate of change of the HEG signal, which is shown
in the middle oscilloscope. The lower trend shows longer term progress, with
training periods marked as green blocks.
2. HEG DVD Design
Two thresholds, each having a different averaging period, control aspects of the
The long term trend (bottom) shows the effects of two training peiods (green
For further information see the User Guide for the HEG designs. This can be downloaded
for free. Visit the downloads page by clicking the link in the navigation menu.
© Copyright Glyn Blackett York Mind-Body Health, York Science Park, York YO10 5NY * Tel: 01904 435 267 * Biofeedback * Neurofeedback * Neurotherapy