Language is an important tool that influences all facets of our lives. We use language to express our thoughts, feelings and emotions. It influences how we think, feel or perceive the people and environment around us. Language understanding as well as production are two complex processes of the human brain. Have you ever thought about how our ability to understand and use language is developed, or how our brain is involved in this process?
Does our brain only help in the semantic understanding of words? If yes, then how do some words and sentences trigger certain emotions or calm us down? How does language influence our thoughts? This article will reflect on Language Development and what brain networks are involved in this process.
Language Development in the Brain
Among all the species, humans can express an infinite number of ideas with a limited set of symbols. There are a number of theories that propose how language development takes place among children. The earliest theory of language development by behaviourism proposes that language develops using environmental influence, through imitation, reinforcement and conditioning. Hence, according to behaviourists, children learn language by mimicking what they hear and receiving positive feedback for correctly using the language.
For example, when the child says apple and the mother smiles and gives him an apple, the child’s language development is encouraged as he gets a rewarding outcome. However, the most prominent view is presented by the nativist Noam Chomsky, who proposed that language is Innate. What he meant was that language development takes place through Innate structures and mechanisms. He used the term language acquisition (LAD) device for this. LAD is the inborn capacity of the child to acquire language.
He gave the concept of Universal grammar, by which he meant that all human languages share some common properties and all language learners converge on the same grammar despite being exposed to different inputs. This means that the child just needs to learn the words of his language because is the grammar is innate. (Ambridge & Lieven). He believed that children know things about language which cannot be learned by mere observation, social interaction or from inputs available to them. He posited a critical period for language acquisition during which the brain is receptive to linguistic inputs, making language learning more efficient.
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Brain structures involved in language processing
Language function is more dominant in the left hemisphere. This is called language lateralisation. It is a phenomenon in which one hemisphere shows greater involvement in language function than the other. The left hemisphere of the brain controls language in about 97% of the right handed people and majority of left handed people as well. In the left hemisphere, also called the “ dominant hemisphere”, there are two important regions for language production and comprehension. These two regions are : Broca’s area and Wernicke’s area.
Broca’s area
Located in the posterior part of the frontal lobe, it is a vital region for the production of speech and the processing of language. This part of the brain is mostly relied upon for the formation of words, construction of sentences and organisation of grammar. It helps in fluent communication through language. This crucial part of the brain was discovered by Pierre Paul Broca when he identified a common region in the brain in two of his speech-impaired patients. It directly impacts the motor movements to allow for speech.
Not only for speech, but it is also necessary for language repetition, gesture production, sentence grammar and fluidity as well as interpretation of other’s actions (Skipper JI, 2007). Injury to Broca’s area leads to Broca’s aphasia. It is also known as expressive aphasia, characterised by the inability to produce spoken and written language. Depending on severity, some people may on;y speak single words.
Their speech may contain meaningful content but may omit articles, prepositions and words of grammatical significance. Thus, they may be said to have telegraphic speech. Broca’s area is also correlated to speech disorders of stuttering, also called stammering. In this, speech fluidity is interrupted by unintentional prolongations and repetitions of syllables, words or phrases (Stinnett et al., 2023).
Read More: Critical Period in Brain Development
Wernicke’s area
Wernicke’s area is a brain region located in the posterior part of the temporal lobe of the left hemisphere. It was first identified by Carl Wernicke in the late 19th century. In his work, Wernicke observed patients with receptive aphasia characterised by difficulty in understanding language despite intact ability to produce language (Wernicke, C.,1969). Hence, he discovered the brain region, Wernicke’s area, which plays a role in the comprehension of meaningful speech. It supports phonological retrieval, which allows mental representation of phonemes that are articulated in the temporal order.
It plays an important role in the ability to read aloud, repeat speech and retrieve words. Hence, it performs five important functions: recognising speech sounds, speech comprehension, semantic processing, written language understanding and language integration. Damage to Wernicke’s area results in fluent but nonsensical speech production with poor comprehension. This is termed as Wernicke’s aphasia (MSc, O. G., 2025). It is also termed as receptive aphasia, characterised by the inability to comprehend written or spoken language.
Read More: Journey of Human Development: Domains and Stages of Development
Arcuate fasciculus
These are a bundle of nerve fibres connecting Wernicke’s and Broca’s area. It acts as a primary pathway for the transmission of language-related information, facilitating conversion of auditory input into articulated speech. It is important for language processing, including comprehension, production, phonological processing, reading, speech fluency, semantic fluency and letter fluency.
Contributes to some cognitive functions, such as working memory. Damage to this area can lead to a condition termed conduction aphasia, characterised by inability or difficulty in repeating spoken language despite intact comprehension and production ability (Glasser et al., 2008). Other involved areas include the primary auditory cortex to receive auditory input and the visual association areas responsible for processing and interpretation of visual stimuli, including written language.
The Sapir-Whorf hypothesis
The Sapir-Whorf hypothesis was proposed by anthropologist and linguist Edward Sapir and his student Benjamin Lee Whorf. This hypothesis proposes that language influences our thoughts and perceptions. According to them, the particular language one speaks influences the way one perceives one’s reality. It is also called the Language Relativity hypothesis. For example, there are huge color perception differences among different cultures. In English, there are distinct categories for the colours blue and green, while Koreans view blue as a variant of green and hence use a single word for both colours.
Similarly they our language shapes how we understand and experience different emotions. But this does not seem to be true. For example, in Germany, there’s an emotion called gemütlichkeit. It means “cosy” or “friendly”. It refers to the peace experienced when we’re surrounded by people we feel loved or connected with. There is no direct translation of this term in English. You may have experienced it with friends or family. Regardless of which language we speak, we are capable of feeling this emotion. Hence, lack of words doesn’t mean we won’t experience the emotion. Having words to describe emotions can help us better understand and regulate them, but it is also possible to experience them without any label.
Read More: Does Language Shape Our Emotional Worldview?
Conclusion
Language is a tool for communication. It is a structured system consisting of grammar and vocabulary. Theorists widely vary in their views regarding the development of language in a child. While some believe it is based on observational learning and reinforcement, others believe it is innate, and humans have a critical period for language development. Several brain structures are involved in language production as well as comprehension.
The major area for language production is located in the left hemisphere of the frontal lobe, called Broca’s area, while the brain region responsible for language comprehension is located in the temporal lobe of the left hemisphere, called Wernicke’s area. Another equally important area connecting both regions is the arcuate fasciculus. Language is proposed to influence thought and perception according to the linguistic relativity hypothesis. Language gives structure, meaning and clarity, but the experience of certain emotions is not limited to linguistic labels.
References +
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