a deficit in the ability to speak or comprehend language is called aphasia.
a deficit in the ability to speak or comprehend language is called aphasia.
a deficit in the ability to speak or comprehend language is called?
aphasia
primary progressive aphasia (ppa) is a type of neurological syndrome in which language capabilities slowly and progressively become impaired. as with other types of aphasia, the symptoms that accompany ppa depend on what parts of the left hemisphere are significantly damaged. however, unlike most other aphasias, ppa results from continuous deterioration in brain tissue, which leads to early symptoms being far less detrimental than later symptoms. those with ppa slowly lose the ability to speak, write, read, and generally comprehend language. eventually, almost every patient becomes mute and completely loses the ability to understand both written and spoken language. although it was first described as solely impairment of language capabilities while other mental functions remain intact, it is now recognized that many, if not most of those afflicted suffer from impairment of memory, short term memory formation and loss of executive functions. it was first described as a distinct syndrome by m.-marsel mesulam in 1982. primary progressive aphasias have a clinical and pathological overlap with the frontotemporal lobar degeneration (ftld) spectrum of disorders and alzheimer's disease. however, ppa is not considered synonymous to alzheimer's disease due to the fact that, unlike those affected by alzheimer's disease, those with ppa are generally able to maintain the ability to care for themselves, remain employed, and pursue interests and hobbies. moreover, in diseases such as alzheimer's disease, pick's disease, and creutzfeldt-jakob disease, progressive deterioration of comprehension and production of language is just one of the many possible types of mental deterioration, such as the progressive decline of memory, motor skills, reasoning, awareness, and visuospatial skills.
primary progressive aphasia
bullet::::- the "input hypothesis". this states that learners progress in their knowledge of the language when they comprehend language input that is slightly more advanced than their current level. krashen called this level of input "i+1", where "i" is the learner's interlanguage and "+1" is the next stage of language acquisition.









































bullet::::- the "acquisition–learning hypothesis" claims that there is a strict separation between "acquisition" and "learning"; krashen saw acquisition as a purely subconscious process and learning as a conscious process, and claimed that improvement in language ability was only dependent upon acquisition and never on learning.
input hypothesis