同: 手指失認

WordNet

search for on the computer; "I fingered my boss and found that he is not logged on in the afternoons"
the length of breadth of a finger used as a linear measure (同)fingerbreadth, finger''s breadth, digit
one of the parts of a glove that provides covering for a finger or thumb
any of the terminal members of the hand (sometimes excepting the thumb); "her fingers were long and thin"
feel or handle with the fingers; "finger the binding of the book" (同)thumb
indicate the fingering for the playing of musical scores for keyboard instruments
the placement of the fingers for playing different notes (or sequences of notes) on a musical instrument
touching something with the fingers
inability to recognize objects by use of the senses
having or resembling a finger or fingers; often used in combination; "the fingered roots of giant trees"; "rosy-fingered"; "three-fingered cartoon characters"

PrepTutorEJDIC

(手の)『指』 / 指の形をしたもの;(手袋の)指;(メーターなどの)指針 / 指幅(びん入りの酒の量を測るときなど) / …‘に'指で触れる,‘を'指でいじる / 〈楽器など〉‘を'指でひく,つまびく
指で触れる(いじる)こと / (弦楽器おひくときの)運指法;運指記号
指状の;指でいじられた / (楽譜が奏法を指示する)指印のついた

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/07/09 09:08:28」(JST)

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Finger agnosia, first defined in 1924 by Josef Gerstmann, is the loss in the ability “to distinguish, name, or recognize the fingers”,^[1] not only with the patient’s own fingers, but also the fingers of others, and drawing and other representations of fingers. It is one of a tetrad of symptoms in Gerstmann syndrome, although it is also possible for finger agnosia to exist on its own without any other disorders.^[2] Usually, lesions to the left angular gyrus and posterior parietal areas can lead to finger agnosia.^[3] ^[4] ^[5] ^[6] ^[7]

Causes

Lesions to the left angular gyrus are associated with finger agnosia, as well as the other symptoms of Gerstmann Syndrome, also known as Angular Gyrus Syndrome. In a study by Rusconi et al., repetitive transcranial magnetic stimulation was used in healthy individuals to simulate finger agnosia. Stimulation to the intraparietal sulcus, supramarginal gyrus, as well as the left and right angular gyrus and posterior parietal areas caused difficulties in naming, recognizing, and distinguishing fingers.^[8]

Attributes

Patients with finger agnosia may have difficulty selectively moving fingers, regardless if it is by command or imitation. Others show an inability to name or point to others’ fingers, or to show the same finger on the opposite hand. Persons with finger agnosia are able to name and point to a finger when able to use visual guidance, but will have more errors than a person without the disorder. When their own hand is out of sight and they are asked to name a finger that was touched, they are unable to do so and perform at chance.

Finger Agnosia without Gerstmann Syndrome

Although it is a necessary component of Gerstmann’s syndrome, cases of finger agnosia alone have been reported. Della Sala et al. reported a woman with a stroke in the left subcortical posterior parietal area who had only finger agnosia a year and a half later.^[9]

Acalculia and Finger Agnosia

There is a strong link between acalculia and finger agnosia. Early in development, calculation begins with our fingers. The order that we use when we count with our finger is very specific and it is found in a variety of different cultures. The use of a base ten number system is also found in many cultures. Gerstmann believed that it was no coincidence the word digit means both a finger and any numeral.^[10] Rusconi et al. suggested that these two conditions co-occur because they are close in cortical territory. In their 2005 study with repetitive transcranial magnetic stimulation (rTMS), they noted both finger agnosia and acalculia in the test subjects when areas of the intraparietal sulcus were stimulated. They concluded that the areas underlying finger agnosia and acalculia are extremely close to one another, but distinct. These areas receive blood from the same branch of the middle cerebral artery. Any damage to that blood supply would cause symptoms of both acalculia and finger agnosia.^[11]

Treatment and Prognosis

As in many other agnosias, those with the disorder have difficulty recognizing their errors and often do not correct themselves. There is no known treatment for finger agnosia. Typically, finger agnosia does not present difficulties in daily life. In most cases, visual guidance can help with any difficulty in distinguishing or moving the appropriate finger.

References

^ Ardila, A, Mauricio, C,. Rosselli, M. Angular Gyrus Syndrome revisited: Acalculia, Finger Agnosia, Right-left Disorientation and Semantic Aphasia. Aphasiology 14.7 (2000): 743-54.
^ Della Sala, S, and Spinnler, H. Finger Agnosia: fiction or reality? Archives of Neurology 51.5 (1994): 448-50.
^ Ardila, A, Mauricio, C,. Rosselli, M. Angular Gyrus Syndrome revisited: Acalculia, Finger Agnosia, Right-left Disorientation and Semantic Aphasia. Aphasiology 14.7 (2000): 743-54.
^ Della Sala, S, and Spinnler, H. Finger Agnosia: fiction or reality? Archives of Neurology 51.5 (1994): 448-50.
^ Anema, H. A., Kessels, C., De Haan, E., Kappelle, L.J., Leijten F., Van Zandvoort, M., Dijkerman, H. Differences in finger localisation performance of patients with Finger Agnosia. NeuroReport 19.14 (2008): 1429-433.
^ Rusconi, E, Walsh, V., Butterworth, B. Dexterity with numbers: rTMS over Left Angular Gyrus disrupts finger gnosis and number processing. Neuropsychologia 43 (2005): 1609-624.
^ Gerstmann, J. Syndrome of Finger Agnosia, disorientation for right and left, Agraphia, and Acalculia. Archives of Neurology and Psychiatry 44 (1940): 398-408.
^ Rusconi, E, Walsh, V., Butterworth, B. Dexterity with numbers: rTMS over Left Angular Gyrus disrupts finger gnosis and number processing. Neuropsychologia 43 (2005): 1609-624.
^ Della Sala, S, and Spinnler, H. Finger Agnosia: fiction or reality? Archives of Neurology 51.5 (1994): 448-50.
^ Gerstmann, J. Syndrome of Finger Agnosia, disorientation for right and left, Agraphia, and Acalculia. Archives of Neurology and Psychiatry 44 (1940): 398-408.
^ Rusconi, E, Walsh, V., Butterworth, B. Dexterity with numbers: rTMS over Left Angular Gyrus disrupts finger gnosis and number processing. Neuropsychologia 43 (2005): 1609-624.

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