WordNet

a loss of the ability to recognize objects by handling them (同)tactile_agnosia

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/10/01 20:30:51」(JST)

wiki en

Astereognosis (or tactile agnosia if only one hand is affected) is the inability to identify an object by active touch of the hands without other sensory input. An individual with astereognosis is unable to identify objects by handling them, despite intact sensation.^[1] With the absence of vision (i.e. eyes closed), an individual with astereognosis is unable to identify what is placed in their hand.^[1] As opposed to agnosia, when the object is observed visually, one should be able to successfully identify the object.

Individuals with tactile agnosia may be able to identify the name, purpose, or origin of an object with their left hand but not their right, or vice versa, or both hands. Astereognosis refers specifically to those who lack tactile recognition in both hands. In the affected hand(s) they may be able to identify basic shapes such as pyramids and spheres (with abnormally high difficulty) but still not tactilely recognize common objects by easily recognizable and unique features such as a fork by its prongs (though the individual may report feeling a long, metal rod with multiple, pointy rods stemming off in uniform direction).^[2] These symptoms suggest that a very specific part of the brain is responsible for making the connections between tactile stimuli and functions/relationships of that stimuli, which, along with the relatively low impact this disorder has on a person's quality of life, helps explain the rarity of reports and research of individuals with tactile agnosia.^[2]

Astereognosis is associated with lesions of the parietal lobe or dorsal column or parieto-temporo-occipital lobe (posterior association areas) of either the right or left hemisphere of the cerebral cortex.^[1] ^[2]

References

^ ^a ^b ^c O'Sullivan, S.B.; Schmitz, T.J. (2007). Physical Rehabilitation (5th ed.). Philadelphia: F.A. Davis Company. pp. 1180–1181.
^ ^a ^b ^c Gerstmann, J. (2001). Pure Tactile Agnosia Cognitive Neuropsychology. pp. 267–274.

This article about a medical condition affecting the nervous system is a stub. You can help Wikipedia by expanding it.

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. 失語症患者へのアプローチ approach to the patient with aphasia
2. 脳性麻痺の臨床的特徴および分類 clinical features and classification of cerebral palsy
3. 大脳皮質基底核変性症 corticobasal degeneration

English Journal

Subgroup differences in the lexical tone mismatch negativity (MMN) among Mandarin speakers with congenital amusia.

Nan Y1, Huang WT2, Wang WJ2, Liu C3, Dong Q2.
Biological psychology.Biol Psychol.2016 Jan;113:59-67. doi: 10.1016/j.biopsycho.2015.11.010. Epub 2015 Nov 27.
The association/dissociation of pitch processing between music and language is a long lasting debate. We examined this music-language relationship by investigating to what extent pitch deficits in these two domains were dissociable. We focused on a special neurodevelopmental pitch disorder - congeni
PMID 26638759

Reversible pure word deafness due to inferior colliculi compression by a pineal germinoma in a young adult.

Joswig H1, Schönenberger U2, Brügge D3, Richter H4, Surbeck W5.
Clinical neurology and neurosurgery.Clin Neurol Neurosurg.2015 Dec;139:62-5. doi: 10.1016/j.clineuro.2015.08.034. Epub 2015 Sep 9.
We report a clinical case of a 19-year-old male patient who developed pure word deafness due to the local compressive effect of a pineal germinoma on the inferior colliculi of the quadrigeminal plate. After percutaneous radiation therapy the size of the tumor decreased significantly, while audiometr
PMID 26372938

Impairments in the Face-Processing Network in Developmental Prosopagnosia and Semantic Dementia.

Mendez MF1, Ringman JM, Shapira JS.
Cognitive and behavioral neurology : official journal of the Society for Behavioral and Cognitive Neurology.Cogn Behav Neurol.2015 Dec;28(4):188-97. doi: 10.1097/WNN.0000000000000077.
BACKGROUND: Developmental prosopagnosia (DP) and semantic dementia (SD) may be the two most common neurologic disorders of face processing, but their main clinical and pathophysiologic differences have not been established. To identify those features, we compared patients with DP and SD.METHODS: Fiv
PMID 26705265

Japanese Journal

両側の Useless hand syndrome を主症状とした多発性硬化症の1例

濱田英里,岡本憲省,奥田文悟
臨床神経学 : CLINICAL NEUROLOGY 45(3), 211-215, 2005-03-01
NAID 10015454372

失認の診方 (特集わかりやすい高次脳機能の診方)

鈴木匡子
脳と神経 57(5), 381-385, 2005-05
NAID 40006806048

Related Pictures

Normal Sensory Exam ; Stereognosis - YouTube Physiology of the sensory system - ppt video online download Stereognosis | Occupational Therapy Assessment Guide Brodmann’s areas 3, 1, 2 The Precise Neurological Exam Sign and Symptoms of Psychiatric Disorder (Psychopathology) - ppt download How to Pronounce Astereognosis - YouTube Lesion to Higher Cortical Centers Flashcards | Quizlet