Isochronic tones are regular beats of a single tone

Tone

- Tone :* Tone , a literary technique which encompasses the attitudes toward the subject and toward the audience implied in a literary work* Tone , the pitch and pitch changes in words of certain languages...

 used for brainwave entrainment. Similar to monaural beats

Monaural beats

Monaural beats are used for brainwave entrainment in which two tones which would be used binaural beats are played in each channel resulting in a stronger stimulus. With monaural beats, the interference pattern that produces the beat is outside the brain so headphones are not required...

, the interference pattern that produces the beat

Beat

-Film:*Beat , the smallest unit of dramatic action in a play*Beat , a film about writer William Seward Burroughs*Beat , a 1998 Japanese film*Directorial beat, an exchange of behavior between characters in a screenplay...

 is outside the brain so headphones are not required for entrainment to be effective. They differ from monaural beats, which are constant sine wave

Sine wave

The sine wave or sinusoid is a mathematical function that describes a smooth repetitive oscillation. It occurs often in pure mathematics, as well as physics, signal processing, electrical engineering and many other fields...

 pulses rather than entirely separate pulses of a single tone. As the contrast between noise

Noise

In common use, the word noise means any unwanted sound. In both analog and digital electronics, noise is random unwanted perturbation to a wanted signal; it is called noise as a generalisation of the acoustic noise heard when listening to a weak radio transmission with significant electrical noise...

 and silence

Silence

Silence is the relative or total lack of audible sound. By analogy, the word silence may also refer to any absence of communication, even in media other than speech....

 is more pronounced than the constant pulses of monaural beats, the stimuli

Stimulus (physiology)

In physiology, a stimulus is a detectable change in the internal or external environment. The ability of an organism or organ to respond to external stimuli is called sensitivity....

 is stronger and has a greater effect on brain entrainment.

Isochronic tones work by emitting sound at regular intervals. This excites the thalamus and causes the brain to duplicate the frequency of the Isochronic tones, changing its thought patterns.