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96 CHAPTER 5 CHRONIC TTH ANALYSIS BY EMG AND GSR BIOFEEDBACK

Table 5.1 The Rays Emitted by an Individual in Different Moods
Name of Frequency (Hz/
Level Cycle/s) Description
Beta 14–30 Typical level of daily mental activity associated with tension or stress.
Alpha 8–13 Relaxed, passive attention, often considered the goal of relaxation exercises.
While this is a very relaxing state, and useful to be practiced, it is sometimes
incorrectly thought to be the goal of yoga Nidra.
Theta 4–7 Normally considered to be unconscious, possibly drowsy, or half asleep. This
level is also sometimes incorrectly considered to be the level of Yoga Nidra,
where there is still the experience of images and streams of thought.
Delta 0.5–3.5 Considered to be unconscious dreamless. In Yoga Nidra, the brain waves are at
this level, as if practitioner is in conscious deep sleep, beyond the activities
experienced at the other level.

FIG. 5.5
Biofeedback measurements.

5.5 SENSOR MODALITIES AND OUR APPROACH
5.5.1 BIOFEEDBACK BASED SENSOR MODALITIES
Three professional biofeedback organizations, the Association for Applied Psychophysiology and
Biofeedback (AAPB), Biofeedback Certification International Alliance (BCIA), and the International
Society for Neurofeedback and Research (ISNR), concluded the definition of biofeedback in 2008: “is