Dil ve Beyin

Yazarlar

Berna Deniz Aydın
Tuğçe Gül Çağlar
https://orcid.org/0000-0001-6599-0920

Özet

1.yüzyıldan beri süregelen beyin ve dil ilişkisi araştırmaları, günümüzde gelişen teknolojiyle somut bulgular elde etse de tam olarak aydınlatılamamıştır. Dil süreçleri, beynin en büyük kısmı olan serebrumun yanı sıra serebellum ve beyin sapının senkronize çalışmasıyla gerçekleşen karmaşık bir mekanizmadır. Serebrumda yer alan frontal lob ifade edici dili (Broca alanı), parietal lob okuma-yazmayı (angular girus) ve fonolojiyi (supramarjinal girus), temporal lob ise işitsel işlemlemeyi ve dili anlamayı (Wernicke alanı) yönetirken, insular korteks konuşma artikülasyonunu sağlar. Hemisferik lateralizasyon doğrultusunda sol hemisfer detay odaklı, analitik işlevler ve düz anlamla; sağ hemisfer ise bütünsel sentez, tonlama, vurgu ve mecazi anlamlarla ilişkilidir. İki yarım küre arasındaki bilgi akışını korpus kallozum sağlarken, arkuat fasikülüs Broca ve Wernicke alanlarını birbirine bağlar. İnsanoğlunun sosyal iletişim avantajı olan dil edinimi, anne karnında 28. haftada işitme sisteminin gelişmesi ve ana dilin melodisinin öğrenilmesiyle başlar. Yenidoğan bebekler, ana dillerinin vurgu özelliklerine göre farklı ağlama melodilerine ve temel bir dil ağına sahiptir. Çocukluk boyunca sinir liflerinin kalınlaşması ve yeni üst bağlantıların kurulmasıyla dil ağı gelişir, ergenliğe kadar güçlenen bu dinamik yapı yaşam boyu deneyimlerle şekillenmeye devam eder.

Research on the relationship between the brain and language, ongoing since the 19th century, has not been fully elucidated today despite concrete findings obtained through developing technology. Language processes are a complex mechanism that occurs through the synchronized function of the cerebrum, which is the largest part of the brain, as well as the cerebellum and the brainstem. Within the cerebrum, the frontal lobe manages expressive language (Broca's area), the parietal lobe governs reading-writing (angular gyrus) and phonology (supramarginal gyrus), the temporal lobe handles auditory processing and language comprehension (Wernicke's area), while the insular cortex is responsible for speech articulation. In line with hemispheric lateralization, the left hemisphere is associated with detail-oriented, analytical functions and literal meanings, whereas the right hemisphere is linked to holistic synthesis, intonation, emphasis, and metaphorical meanings. While the corpus callosum ensures the flow of information between the two hemispheres, the arcuate fasciculus connects Broca's and Wernicke's areas. Language acquisition, a social communication advantage for humans, begins in the womb at the 28th week with the development of the auditory system and learning the melody of the native language. Newborn babies possess distinct crying melodies based on the stress characteristics of their native language and have a foundational language network. The language network develops throughout childhood with the thickening of nerve fibers and the establishment of new upper connections; this dynamic structure, strengthening until adolescence, continues to be shaped by experiences throughout life.

Referanslar

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Sayfalar

87-98

Gelecek

17 Eylül 2022

Lisans

Lisans