- Pure word deafness
Pure Word Deafness is caused by bilateral damage to the posterior superior
temporal lobes or disruption of connections between these areas. It exhibits itself as inability to comprehend the meaning of speech, but (in most cases) still being able to hear, speak, read, and write.
The underlying problem seems to be that understanding speech requires the discrimination between specific sounds which are closely spaced in time.cite journal |author=Stefanatos GA, Gershkoff A, Madigan S |title=On pure word deafness, temporal processing, and the left hemisphere |journal=Journal of the International Neuropsychological Society : JINS |volume=11 |issue=4 |pages=456–70; discussion 455 |year=2005 |pmid=16209426 |doi=] Note that this is not unique to speech; studies using non-speech sounds closely spaced in time (dog bark, phone ring, lightning, etc.) have shown that those with pure word deafness are unable to discriminate between those sounds in the majority of cases, though a few putative examples of speech-specific impairment have been documented in the literature.Riley, J. and Cogan, G. (2007) A Two Mechanism Model of Pure Word Deafness. "Maryland Working Papers in Linguistics:" "'16". http://www.ling.umd.edu/publications/volume16/riley.pdf] Saffran EM, Marin OS, Yeni-Komshian GH. (1976) An analysis of speech perception in word deafness. "Brain and Language", 3:209-28.] Additionally, those with pure word deafness are "not" deaf - they can (in the absence of other impairments) hear sounds, including speech (so it has nothing to do with words). As such, "pure word deafness" is something of a misnomer. "Pure word" is intended to mean that only words are affected (not accurate for many cases); "deafness" is intended to specify that these patients have an inability to hear (not accurate).
Pure word deafness is often associated with lesions to the left superior temporal lobe, but no such unilateral case has yet been documented without damage to the white matter tract connecting superior temporal lobes bilaterally or bilateral damage to the superior temporal lobe. These facts, in combination with the existence of cases of damage to these white matter tracts without detectable cortical damage, in combination with cases of pure word deafness resulting enlargement of the III ventricle alone ] suggest that the disorder results from damage to the left-right superior temporal circuit rather than the superior temporal area on one hemisphere or another.
Auditory Processing Disorder
Central hearing loss
Wikimedia Foundation. 2010.
Look at other dictionaries:
Broca's area — Brain: Broca s area Approximate location of Broca s area highlighted in gray … Wikipedia
Aphasia — For other uses, see Aphasia (disambiguation). Aphasia Classification and external resources ICD 10 F80.0 F80.2, R … Wikipedia
Music-specific disorders — Neuroscientists have learned a lot about the role of the brain in numerous cognitive mechanisms by understanding corresponding disorders. Similarly, neuroscientists have come to learn a lot about music cognition by studying music specific… … Wikipedia
Auditory processing disorder — Infobox Disease Name = PAGENAME Caption = DiseasesDB = ICD10 = ICD9 = ICD9|388.4, ICD9|389.9, ICD9|389.12, or ICD9|389.14 ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = D001308 Auditory Processing Disorder (APD) (previously … Wikipedia
Language module — refers to a hypothesized structure in the human brain (anatomical module) or cognitive system (functional module) that some psycholinguists (e.g., Steven Pinker) claim contains innate capacities for language. According to Jerry Fodor the sine qua … Wikipedia
Neurona sensorial — Diagrama que muestra la relación entre neuronas sensoriales y motoneuronas. Se aprecia cómo al pinchar un alfiler en la piel los receptores del dolor recogen la información para transmitirla a las neuronas sensoriales. Las neuronas sensoriales se … Wikipedia Español
Aphasia — Literally aphasia means no speech. Aphasia can apply to a defect in expression or comprehension. * * * Impaired or absent comprehension or production of, or communication by, speech, writing, or signs, due to an acquired lesion of the dominant… … Medical dictionary
Eugenics — is the self direction of human evolution : Logo from the Second International Eugenics Conference, 1921, depicting Eugenics as a tree which unites a variety of different fields. Eugenics is the applied science or the bio social movement which… … Wikipedia
ear, human — ▪ anatomy Introduction organ of hearing and equilibrium that detects and analyzes noises by transduction (or the conversion of sound waves into electrochemical impulses) and maintains the sense of balance (equilibrium). The human ear, like … Universalium
Cat — For other uses, see Cat (disambiguation) and Cats (disambiguation). Domestic cat … Wikipedia