Angular rotation (brain): areas, functions and associated disorders

The ability of the person to understand what he hears or reads, is something that happens automatically, that we rarely stop to think thanks to what brain structures this is possible.

These among many other functions they are typical of angular rotation of the brain. Throughout this article, we’ll talk about what it is, where it is, what it does and what happens when it’s not optimal.

    What is angular rotation?

    Brain twists refer to those mounds formed in the brain, caused by folds in the cerebral cortex. One of them is the angular bend, this bend is located in the posterior zone of one of the cerebral convolutions; specifically in the one located between the intraparietal groove and the horizontal branch of Silvio’s cleft.

    In addition, angular rotation corresponds to Brodmann zone 39, Which, together with zones 22 and 40, form the Wernicke zone. This region of the temporal lobe is the so-called auditory associative cortex and its main function is to enable people to understand words and to have the ability to produce speech with meaning.

    An injury in this area of ​​Wernicke can cause both blindness and deafness. Verbal blindness, or alexia, is the inability to understand written words; while verbal deafness, or auditory auditory agnosia, consists of the inability to understand the words heard.

    finally angular rotation is associated with both language interpretation and math or cognition, Integration of information from other areas of the brain. Next, we will see what implications angular rotation has on different brain functions.

      What functions does it have?

      As mentioned above, angular rotation deals with aspects related to language production, numeracy and math skills, visuospatial ability, and some cognitive aspects. These are functions acquired through experience, but which are based on the biological predispositions that the human brain possesses during learning. In other words, without adequate stimulation, this part of the brain will not develop well.

      Then we break down all those functions that angular rotation performs in the brain these functions shown below.

      1. Language

      Given its implication in the functions of the Wernicke region, angular rotation has a key role in the production of meaningful phrases and expressions.

      It is also one of the areas responsible for oral written comprehension. In other words, thanks to it, people can understand what we read.

      2. Calculation

      As for functions related to calculation and mathematics, angular rotation is involved in the person’s ability to perform mathematical operations necessary to obtain a result, a value or to solve any type of mathematical problem.

      On the other hand, he is also involved in the learning of arithmetic or basic mathematical operations and in the interpretation of numerical quantities and dimensions.

      3. Visual

      Angular rotation is involved in the spatial focusing of attention, that is, in spatial orientation and the search for visual stimuli.

      Outraged, he is also in charge of visuospatial processing. Through visuospatial processing, people can identify where objects in space are located, as well as the distance between them or between us and them.

      4. Other functions

      Finally, there are a multitude of functions in which angular rotation plays a more or less important role.

      These functions include:

      • Involvement in creative verbal tasks.
      • Executive driving control.
      • Processing of action sequences.
      • Reading and encoding of symbols.
      • Involvement in the theory of mind.

      Theory of mind is a term that refers to the person’s ability to perceive and identify the thoughts and goals of others and attribute them to the person sending them.

        What if you hurt yourself ?: Gerstmann syndrome

        If due to injury or neurodegenerative process the angular gyrus suffers any kind of damage, the above functions can be seriously affected.

        There is also a specific syndrome associated with injury or deterioration of this area known as Gerstmann syndrome.

        This neurological disorder has been associated with lesions or defective angular rotation activity. It is characterized by a very low impact on the population and by manifesting itself by a set of symptoms linked to the sensation, the perception and the coding of information from the different senses.

          Symptoms of Gerstmann syndrome

          Among the most representative symptoms of this condition are the following.

          1. Digital agnosia

          It is one of the main symptoms of Gerstmann syndrome. This type of agnosia is distinguished by preventing the person from distinguishing or identifying the fingers of the hand, both their own and those of others.

          This agnosia is not associated with any type of frailty or lack of tactile perception of the fingers. The person is simply unable to name, choose, identify or orient their own fingers.

          2. Acalculia

          Acalculia is the onset of difficulties related to math and arithmetic skills. Within this symptom, the person can manifest different types of deficits:

          • Inability to perform mathematical operations both written and mental.
          • Problems of interpretation of mathematical signs.
          • Problems of maintenance or continuation of numerical controls or series.
          • Inability to design sequences.
          • Difficulty using numbers correctly.

          3. Agraphia

          When it comes to written language, people with Gerstmann syndrome suffer from a deficit in the ability and ability to write. Also known as a staple.

          These patients present with problems transcribing the words heard, spontaneous writing and copying.

          In addition, other symptoms specific to the staple are:

          • Changed the ability to draw letters correctly.
          • Lack of symmetry of letters.
          • Changes in the orientation of lines when writing.
          • Using different fonts.
          • Invention of his own characters.

          4. Spatial disorientation

          Patients with angular gland lesions they may also have problems distinguishing left and right. As for the appearance, there is a deficit of lateral orientation of the body itself in space.

          In addition, these patients present with great difficulty in identifying the left or right plane of any object, place, spatial situation, or even parts of their own body.

          Bibliographical references:

          • Hirnstein, M .; Bayer, U .; Ellison, A .; Hausmann, M. (2011). TMS on the left angular circumference affects the ability to distinguish left from right. Neuropsychology. 49 (1): pages 29 to 33.
          • Lee, H; Devlin, JT; Shakeshaft, C .; Stewart, LH; Brennan, A .; Glensman, J .; Pitcher, K .; Crinion, J .; Mechelli, A .; Frackowiak, RS; Verd, DW; Price, CJ (2007). Anatomical traces of vocabulary acquisition in the adolescent brain. J Neurosciences. 27 (5): pages 1184 to 1189.
          • Vatansever, D .; Manktelow, AE; Sahakian, BJ; Menon, DK; Stamatakis, EA (2017). Network connectivity in angular mode by default via working memory load. Mapping of the human brain. 38 (1): pages 41 to 52.
          • Rushworth, MF; Behrens, TE; Johansen-Berg, H. (2006). Connection patterns distinguish 3 regions of the human parietal cortex. Cereb Cortex. 16 (10): pages 1418-1430.

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