A combination of two signals will give you monaural and binaural
beats. The difference is that the signals from monaural beats can be played back in speakers. Playing two signals seperately
in speakers will cause them to mix in the air to produce a monaural beat. Also, the signals can be mix with software before
it is played back.
Monaural beats don't seem to be as effective with frequencies below 4Hz. However, above that they
are reputed with being more effective than binaural beats. Unfortunately too much noise can drastically
reduce the effect of monaural beats for brainwave entrainment. Also, when creating these beats, the tones must be of equal
intensity, this will ensure the sound is clean and pure.
Monaural beats can be used with speakers or earphones. However,
if you choose to use speakers, you must keep background or distracting noises to a minimum.
A single tone manually
spaced, turning on or off is called an isochronic tone. Think about a light switch, it's either on or off. The tones go from
full sound to silence. Sort of like a chopper effect.
Like monaural beats, isochronic tones can be used with spearkers
or earphones. This is a great advantage, especially when it comes to individuals who have little or no hearing in one ear.
Also, because of the distinct on/off sound, these tones can be more effective than monaural and binaural
Isochronic tones can also be used to entrain different sides of the brain because they do not require both ears.
Our right ear is primarily attached to our left brain and vice versa. With this concept in mind, we can easily target and
entrain each hemisphere separately and at the same time.
Frequencies below 4Hz seem to be off limits for isochronic
tones because of their speed. Also the volume of the audio track must be loud enough to be able to percieve the beat, without
causing a headache.