Neurolinguistics(language & brain):
Neurolingustics is the branch of applied linguistics which systematically studies the relation between language and brain. the human brain has two hemispheres .right hemisphere and left hemisphere.
Each hemisphere is responsible for a specific group of tacks.this speialization is called lateralization: the process of specialization is called lateralization.
Lateralization:
the process of specialization of each hemisphered is called lateralization which should happened during the critical age.
Critical age:
some cases are in the word of neurology like genis case and elizabet cases that show us first language acquisition must be taking place up to puberty.

Interaction in this period with other language speakers. area of the brain: left hemisphere is the main part of language process in the brain there are for areas: left hemisphere: a.broca: is the frontal part of left hemisphere for language production.
b.werinke: the postural part of the left hemisphere is called wrinkle area, responsible for speech comprehension.
C:Motor cortex:
between broca and wrinkle there is a part called motor cortex responsible for muscles movement in language production.
D: arcute fasculas:
is a bundle of nerves responsible for relating broca and wrinkle together.
Speech disorder :
some language problems are permanent. part of these are innate and parts are acquired they are called aphasia.
Depending the part of brain which damaged the type of aphasia different.
A:broca aphasia:
when broca is damaged brocas aphasia happen.(motor aphasia)
These people speak afford full and they speak in short structures with just lexical morphemes so it is said that their language is a grammatical.
Wrinkle aphasia: the damage wrinkle area causes wrinkle aphasia: they speak fluently but nonsense .they have two problem, they cannot find the correct word anomia . They just use general words.
Conduction aphasia:
the damage to a actuate fesculces is called conduction aphasia. Since the relation between wrinkle and broca is cut they speak with a lots of pauses and hesitation but they speak with no problem in articulation.
Remember that aphasia is permanent however there are some temporary language flaws. the most common language mistakes are :a tip of the tongue.
b) Slip of the tongue (spoonerism):
is when you feel that the word does not come to the surface. when initial sounds of two word are changed.
For example: miss mu history class.
hiss my history class.
c)Slip of the ear: when the brain cannot correctly distinguish the words of a group of sounds.
gray tape
gray ape