2.11 : 側方化

Brain lateralization refers to the tendency of some cognitive processes or neural functions to be more dominant in one hemisphere of the brain than the other.

The left hemisphere primarily manages logical tasks, such as analytical thinking, and language-related activities, including grammar and vocabulary.

Additionally, the left hemisphere excels in tasks requiring sequential processing and detailed analysis, which is vital for mathematics and logical reasoning.

Conversely, the right hemisphere excels at spatial tasks, recognizing faces, creating visual imagery, and perceiving music.

The right hemisphere plays a crucial role in processing emotional aspects of language, including intonation, and is essential for interpreting social interactions.

For example, after a split-brain surgery, which involves severing the corpus callosum, patients exhibit unique behaviors.

They cannot name objects in their left visual field because the nonverbal right hemisphere processes this information.

These patients can draw objects with their left hand, which is controlled by the right hemisphere.

Once the left hemisphere sees the drawing, the patients are able to name the object, provided the drawing is clear enough.