What is cerebral asymmetry?

What is cerebral asymmetry?

We call cerebral asymmetry is at functional differences between the two cerebral hemispheres. Even when they are almost identical in size, the two hemispheres are not used in the same way and have different functions.


  • 1 Types of cerebral asymmetry
  • 2 The dominant hemisphere
  • 3 The non-dominant hemisphere

Types of cerebral asymmetry

For example, the left hemisphere It controls the right side of the body, distinguishes writing and words, and is the center of verbal memory, writing and arithmetic. Right hemisphere It controls the left side of the body, decodes facial expressions and emotions, helps verbalize emotions, controls the sense of touch, evaluates distances and memorizes everything that is not verbal.

In any case, the two hemispheres are not symmetrical, but there are differences between them, both anatomical and functional; These differences are as follows:

Anatomical asymmetry

Some areas of the left hemisphere are larger than the corresponding ones in the right hemisphere (for example, some areas of the temporal lobe or the lateral fissure).

Functional asymmetry

The left hemisphere is specialized in most people, in language functions, while the right is in more emotional aspects.

Clinical studies and the appearance of various diseases such as tumors, vascular accidents and trauma have provided much data on the functions of each hemisphere.

The results of all these show that a brain under normal conditions functions as a unit, but we can establish some functional differences between the two hemispheres; These differences are as follows:

The dominant hemisphere

  • It has a greater capacity for language.
  • Prepare the information sequentially, analytically and temporally.
  • It is more efficient in operations logical-math.
  • He is more skilled in the dualistic analysis of external reality.

The non-dominant hemisphere

  • It has a reduced capacity for language, but possibly more for prosodic and emotional aspects.
  • It is superior in visual and spatial operations, and geometric structures.
  • It is more emotional, artistic and musical.
  • He is more specialized in a holistic, global analysis of the external world.