The Differences Between Tru-Vu and Harmonics
Omniscreen Eyesets by MindAlive:
Our patented Tru-Vu OmniscreenTM Eyesets are specially designed to allow for the left and right visual fields of each eye to be individually stimulated rather than the entire eye. Now you can experience a whole new dimension to light and sound stimulation!
When using synchronized or “focus ” stimulation during an AVS session, the Tru-Vu OmniscreenTM Eyesets operate the same as with ordinary stimulation from the old style or “Harmonic” eyesets. But when using alternate stimulation or “expand”, or dual frequency, the stimulation is very different with the Tru-Vu OmniscreenTM Eyesets.
The old style eyeset can be uncomfortably dissociating in expand (or alternate stimulation) causing nausea and vertigo in many cases, whereas the Tru-Vu Eyeset dissociates in a much more gentle fashion. A 1996 study revealed that more people prefer the Tru-Vu Eyeset over the old-style harmonic eyeset that competitors make.
The visual pathways to the brain are routed via the nerve network called the optic-chiasm. The optic chiasm connects the left visual fields of both eyes to the right hemisphere of the brain and vice versa.
With regards to the Harmonic Eyesets, alternate stimulation or “expand” stimulates each eye alternately and therefore both geniculate and both thalami also receive a double hit, because each eye is wired to both structures. This produces a frequency-doubling effect and often a subharmonic near the half-frequency, but not at the stimulus frequency. A 10 Hz (alpha) alternating stimulus will flash in the left eye ten times and flash in the right eye ten times in one second, generating a visual evoked response of 20 Hz. Unexpectedly, anxiety may be the result during an “alpha” session, especially when using LEDs, which also produce a strong third harmonic.
The field-independent method, used in the Tru-Vu Omniscreen Eyeset, takes advantage of the unique wiring of the optic chiasm. The Tru-Vu Eyeset flashes into the left visual fields of both eyes at one frequency, while flashing into the right visual fields of both eyes at another frequency, therefore eliciting a different , unique frequency into each hemisphere of the brain. This allows us to do some amazing things. For instance, enhancing left hemisphere beta and right hemisphere SMR has shown great value in improving attention and reducing hyperactivity. Similarly, reducing left hemisphere alpha while enhancing right hemisphere alpha has proven itself for reducing depression, often following one Alpha/Beta session.
Copyright Dave Siever, author and AVS Journal, Michael Landgraf, publisher (2006) CA. All rights reserved.