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tone deafness
Tone deafness is the lack of relative pitch, or the inability to distinguish between musical notes that is not due to the lack of musical training or education. Tone deafness is the congenital form of amusia. It is also known as tune deafness, "tin ear", dysmelodia and dysmusia.
==Description==
The ability to hear and reproduce relative pitch, as with other musical abilities, is present in all societies and in most humans. Tone deafness appears to be genetically influenced although it can also be a result from brain damage. Someone who is unable to reproduce pitches because of a lack of musical training would not be considered tone deaf in a medical sense. Tone deafness affects the ability to hear relative pitch changes produced by a musical instrument.
Tone deaf people seem to be disabled only when it comes to music as they can fully interpret the prosody or intonation of human speech. Tone deafness has a strong negative correlation with belonging to societies with tonal languages. This could be evidence that the ability to reproduce and distinguish between notes may be a learned skill; conversely, it may suggest that the genetic predisposition towards accurate pitch discrimination may influence the linguistic development of a population towards tonality. A correlation between allele frequencies and linguistic typological features has been recently discovered, supporting the latter hypothesis.
Tone deafness is also associated with other musical-specific impairments such as the inability to keep time with music (the lack of rhythm), or the inability to remember or recognize a song. These disabilities can appear separately, but some research shows that they are more likely to appear in tone-deaf people. Experienced musicians, such as W. A. Mathieu, have addressed tone deafness in adults as correctable with training.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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