The process of brain activity synchronization to the perceived beat is called entrainment (Wahbeh et al., 2007).
This effect can induce brain activity corresponding to the perceived beat. The binaural beat induces an interesting effect termed the frequency following effect (Moushegian et al., 1973).
One study measured perception of the beat on different frequency carrier tones and suggested that an intermediate frequency carrier tone of ~440 Hz facilitated the widest range of beat perception compared to lower and higher frequency carrier tones, which facilitated a narrower range (Licklider et al., 1950). In addition to the difference in the 2 tones, the carrier tone, which is the lower tone of the 2 tones, is also involved in the beat perception. For example, when a sinusoidal pure tone of 250 Hz is presented to the left ear and a 256 Hz is simultaneously presented to the right ear, amplitude modulation with a frequency rate of 6 Hz is perceived by the brain (Figure 1). However, a classic study reported that the maximum difference in the two tones for whi ch humans can perceive them as beat is 35 Hz otherwise, 2 separate pure tones were perceived instead (Oster, 1973). The fluctuation in frequency equals the difference in the two pure tones that are presented. The superior olivary complex is believed to be the first nucleus that receives auditory information from both sides of the ears, and binaurally activated phase-sensitive neurons are also found in the inferior colliculus (Kuwada et al. The beat in this phenomenon is generated within the brain and is referred to as a binaural beat. The dichotic presentation of two almost equivalent pure tones but with slightly different frequencies leads to perceive fluctuations sounds which occurs as amplitude modulation generated by the two pure tones, or so-called beat, in the brain. In the same fashion voices sounds and frequencies also affect human brain. Studies have shown that waitresses who wear red tend to get bigger tips, and red even makes us spend more online. Colors have all sorts of impact on how we spend. The reason is nothing but just being hypnotized. For instance when one goes to a supermarket to buy a single thing, he/she leaves the supermarket with a pack of huge amount of shopping.
To hypnotize people to buy or do something is very common now a days. Controlling the human is becoming a common convenient means of not only doing business over the Internet but also getting more economical ability and powered to control different societies.
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