Chimpanzees Therefore Also Have

It is not true that vowels play a leading role in communication between human beings. Consonants play a leading role; vowels are just a vector of energy (we can’t pronounce consonants without vowels). Also, no human language is just vowel and chimpanzees only pronounce vowels. There are human languages ​​that reduce the vowels to the maximum, up to 1. Most of the information is in the consonants (just look at the current sms or whatsapp). 3. Unreal data. Fitch himself [43] found that the data on which the previous paradigm was based were not real, since with the same data from studies linking the base of the skull to the position of the larynx, it was possible to show that no there is no relationship.

Phillip Lieberman [44] and Fitch himself have studied successive series (making tomographs throughout development) and observed how the larynx goes down until the end of adolescence. There is, therefore, no correlation, they are independent characters. Since it is not possible to reconstruct the hearing aid and we cannot know how they spoke, the current trend is to change perspective: it is possible to know how they heard, since bones of the middle ear have been found. It goes, therefore, from studying the phonatory apparatus to studying hearing. The new paradigm focused on hearing Hearing has a physical basis and therefore its physical properties can be reproduced.

Let’s Remember How It Works

The outer ear consists of the earlobe, which is the Belgium phone number  and most visible part, and the outer ear canal, one to two cm long, which ends in a membrane called the eardrum, which vibrates when it receives sound. . The middle ear is a cavity filled with air, separated from the outer ear by the tympanic membrane. It opens into the throat through a narrow duct, the Eustachian tube. The separation with the inner ear are two holes, the windows oval and round, closed by a membrane. The middle ear is crossed, from the tympanic membrane to the oval window, by a chain of three bears: hammer, anvil and stirrup. The inner ear, called the labyrinth because of its complication, has two distinct parts: the screw and the semicircular canals.

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The screw is a coiled tube about 35 mm long. Along its entire length is a membrane in contact with the acoustic nerve. This leads to the brain the stimulus that comes from the vibration of the eardrum, transmitted by the chain of bears in the oval window. Bodies, depending on their mass, length…, do not resonate in the same way in front of all frequencies (the glass of the window does not vibrate the same in front of the different noises of the street). The ear of a mammal is not impartial in transmitting noise, because it also produces an acoustic filter: there are certain frequencies or wavelengths that are extinguished as it passes through the outer and middle ear, and others are amplified.

Our Ear Is Very Selective

It is adjusted to the human voice. Not all mammals care about all the noise in the environment. Therefore, natural selection makes us more sensitive to the noises that do matter to us. The entire structure of the ear has been adapted to better transmit the most important sounds for survival. And in the case of social animals there is no sound more important than the voice of their fellows. From a series of audiograms [45] , we will see how the primates feel, on the axis of the ordinates we put the energy, the decibels, in short, the volume, and on the abscissa the frequencies) New World monkeys Cercopithecids Human chimpanzee Chimpanzee-human comparison Among non-human primates there is a similar W-shaped pattern.

They smell good at about 1 kilohertz (kHz), then there is a loss of sensitivity and they feel good at around 6 kHz. And then the progressive loss of sensitivity. This model of hearing is an adaptation to the vocal communication in the forest. Since in a forest environment the most serious sounds are better. Propagated and because around 1 kHz there is a window in the noises of the forest. In contrast, in humans we have a reverse audiogram. We feel better between 2 and 4 kHz (the frequency of consonants): where other primates do not feel well. We increase the sensitivity (and from 5 kHz we begin to lose sensitivity).

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