We learn about what asteroognosis is for the first time from fairy tales.
This is exactly the same, incomprehensible mind of the situation: bring it - it's not known what is unknown from where. After all, how does it look like, the king himself does not know - the wise man explained to him what it feels like, so the king did not listen anymore, just decided: I want to own it!
And then, as usual - a decree: half the kingdom. .. royal son-in-law. .. and other delights. How not to be tempted?
And with this foggy instruction Ivan the fool is sent on a journey with all the inconveniences.
Suddenly it becomes clear that this is in the pitch darkness of the dungeon. Not scary - there is a lamp - zarepitsevo feather. Or a stray cat, who has lost his way, sees in the dark as he does in the daytime, helping out.
But here's a new bad luck: it's invisible! And if so, how do you get it then?
Yes, and it would be obvious - what's the use, if the eyes of horror themselves screwed up - around some demons! Ivan grabs at random - and run! 
Everything is coming to an end: it becomes Ivan the tsar and the happy spouse - the love for the tsar's daughter turns out to be stronger than the spells.
And the place of a fool is occupied by the king who has been removed from the throne.
One thing remains unclear: what is it all about - is invisible to the eye, and to the touch - is it? For no one knows what the sensations should be, but the king will not ask anymore - he died from grief.
The object of science - asteroognosis. ..
In literal translation from Greek the term means: lack of solid knowledge. But this is not the hesitation of the summoned to the blackboard.
Astereognosia is a perception disorder with no recognition at the touch. The phenomenon, when with closed eyes it is impossible to understand: what is in hands or at hand? This lack of recognition in the case when vision does not participate in the analysis, the option: do not "feel" with a look-hands do not recognize it.
And it is not necessary to study the one in hand, it is possible to not even recognize the parts of your own body to touch, it all depends on the category and depth of the pathological condition.
For the first time the disorder can be seen with the often accompanying phenomenon of semantic aphasia - the complexity of perception or misunderstanding of a foreign speech addressed to the patient. Either with kinesthetic apraxia, when the previously coordinated work process "falls apart" into separate uncoordinated movements.
This impossibility of "assembling mosaic details from the parts" occurs when the cortex of the lower parietal zone of the brain is damaged, while the right-handed asteroognosis appears when the process develops in the left anterior margin gyrus. As a result of the disturbance caused to her in the analysis-synthesis of skin-kinesthetic impulses, the ability to create a tactile "portrait" of the subject disappears.
Gnosis disorders
There may be a "misunderstanding" when you feel the object with one hand, and simultaneously exploring it with two, like the inability to evaluate individual properties of an object, and identify it as a whole.
With asteroognosis of the true( primary, or aperceptor, caused by the lesion of the brain zone in the posterocentral gyrus and the vertebral column), the researcher knows that there is something on his finger, understands its properties - but does not realize that it is a ring.
When the most frequent pathology in the postcentral gyre of asteroognosis is false( secondary, or perceptor, or stereoneisthesis), the sense of touch is frustrated.
Specifically, there comes a loss of both superficial and deep sensitivity: do the hands feel what they should feel, whether not, and whether they feel at all - the patient with closed eyes is unclear.
. .. and other tactile impairments of
perception Other signs accompanying asteroognosis arising from lesions in the left hemisphere, in addition to semantic aphasia, are the appearance of the right-handed signs:
- of the ideal version of apraxia;
- agribusiness;
- acalculium.
This is not just a perception disorder - it is the impossibility of calculations related to the concepts of time, mass, space.
In addition to asteroognosis, there are other disorders of tactile recognition in the form of the following types of agnosia:
- alphanumeric ( tactile alexia) - impossibility to recognize symbols that are written on the palm of your hand;
- finger - impossibility of recognizing the involved finger when closing eyes;
- somatagnosis - a disorder of perception of one's own body, specifically - its position in space, or parts of it relative to each other( autopagnosia).
Time for decisive actions
For the diagnosis of asteroognosis, the patient feels the subject with closed eyes and answers the questions asked by the doctor about its properties, shape, position in the hand and the like.
Based on the analysis of the samples, additional research methods and necessary consultations with specialists of other profiles, the neurologist makes a decision about the need for a particular therapy: conservative or neurosurgical.
