Definition Sensorimotor
Precuneus and subdivisions
Part of the superior parietal lobule, which is hidden in the medial longitudinal gap between the two hemispheres is called precuneus. Its precise definition, the precuneus is a structure in the brains over the cuneus and located in the parietal lobe. Some authors say that precuneus is part of the limbic system.
The Latin form of praecuneus was first used in 1868 and the precuneus English in 1879. It is the medial portion of the superior parietal cortex. It is involved the following things:
- Episodic memory
- visual-spatial processing
- Reflections in itself, and aspects of consciousness.
Location precuneus
It is difficult to study the location of precuneus. Sometimes we can not study the location in case of damage caused by a stroke, and wounds. So you can say that precuneus is the hardest part of mapping the entire cortical surface.
Subdivisions
It has three subdivisions, which are as follows
- Sensorimotor Anterior Region
- Cognitive / Associative Central Region
- Visual Posterior Region
Now we see these three parts in detail:
- Around the margin of the cingulate sulcus, Sensorimotor Anterior occurs. Sensorimotor areas include more central lobule, supplementary motor area, premotor cortex, somatosensory area, parietal operculum and the insula and Sensorimotor Anterior connected with these components. In human fMRI studies show that a good connection between caudalmost of parahippocampal and superior temporal gyrus. And not related to the inferior parietal lobule, prefrontal cortex and not the primary motor cortex.
- Around the precuneal sulcus, is cognitive occurred. Cognitive connected with the inferior parietal lobule and angular gyrus and the prefrontal areas. It has no connections with the premotor, motor and somatosensory areas. It is connected to the areas of executive functions, memory and motor planning.
- Along the parieto-occipital fissure, Visual Posterior place. It has connections to visual areas in the cuneus and primary visual cortex.
Functions of precuneus
You could say that precuneus two important functions in the form of mental images and visual-spatial has images. The first is related to the self and it is located in the front part of the precuneus to posterior regions involved in episodic memory.
- Self in functional imaging of the precuneus is related to the processes involved in self-awareness, such as reflective self-awareness.
- Precuneus is involved in the memory tasks. Means that you have something, such as images, people have seen and try to remember. In the recall of episodic memories related to past episodes includes the self, the precuneus is involved in the left prefrontal cortex. It is also involved in the source memory with the left prefrontal cortex. In the left prefrontal cortex, the role of The precuneus proposed providing rich episodic contextual associations is used by the prefrontal cortex to select the correct past memory. It is also important role in the memory of memories. Here his role is proposed to provide a rich episodic contextual associations used by the prefrontal cortex to select correct past memory. So you can say that precuneus is involved in various processes such as attention, episodic memory retrieval, working memory and conscious awareness.
- When an individual moves and makes the images or preparing them, the precuneus is involved in directing attention in space. Between motor targets, the precuneus involved in motor imagination and the attention shift. Motor coordination necessary shift attention to the different spatial locations, is also involved in precuneus that. Dorsal premotor cortex involved in visual-spatial mental operations, precuneus is also working with that. The precuneus helps control the success of that operation in the field internal representation of visual images, while the premotor area is concerned with the mental functioning. In mental imagery, the role of the precuneus extends to that of modeling other people's viewpoints.
- The precuneus is "crucial for conscious processing of information, along with the posterior cingulated. The evidence for this link consciousness of the effects of its disruption in epilepsy, brain damage and vegetative state. It is one of the areas of the brains most disabled during slow-wave sleep and rapid eye movement sleep. If they then subliminal supraliminal, the precuneus, has been more active in learning words briefly flashed by with the prefrontal cortex.
