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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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Cerebral Hemispheres01:05

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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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Higher Mental Functions of the Brain: Language01:10

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Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
Language formation and comprehension take place in the dominant hemisphere. The dominant hemisphere is responsible for understanding the meaning of spoken, written, or sign language, as well as the ability to communicate. For most people, the left hemisphere is the dominant one. The right hemisphere, then, gives tone and emotional context to the...
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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.
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The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
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Hemispheric dominance in reading system alters contribution to face processing lateralization across development.

Xinyang Liu1, Danni He1, Miaomiao Zhu1

  • 1Key Laboratory of Brain Functional Genomics (MOE & STCSM), Affiliated Mental Health Center (ECNU), Institute of Brain and Education Innovation, School of Psychology and Cognitive Science, East China Normal University, Shanghai 200062, China.

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This study reveals how brain lateralization for face and word processing develops. Neural competition between reading and face perception emerges in adulthood, impacting brain organization.

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • The right hemisphere typically dominates face processing.
  • Neural lateralization can be influenced by co-lateralization and inter-system interactions, such as neural competition from reading acquisition.
  • Developmental changes in these lateralization patterns remain largely unexplored.

Purpose of the Study:

  • To investigate age-related changes in the lateralization of core face and word processing.
  • To examine how relationships between lateralization within and between neural systems evolve during development.
  • To explore the impact of reading acquisition on face processing lateralization across age groups.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to compare brain activity.
  • Participants included 36 school-aged children and 40 young adults.
  • Passive viewing of faces and texts was employed to assess neural lateralization.

Main Results:

  • Both children and adults showed right-hemispheric lateralization for face processing and left-hemispheric for reading.
  • Stronger lateralization in higher-order brain regions was observed for face viewing in all participants, and for text viewing only in adults.
  • Intra-system co-lateralization was present for face processing in both groups; inter-system relationships, specifically negative prediction of FFA asymmetry by Broca's area lateralization, were found only in adults.

Conclusions:

  • Significant developmental shifts occur in the lateralization of face and word processing systems.
  • Neural competition between reading and face perception, impacting functional asymmetry, emerges in adulthood.
  • Provides initial neuroimaging evidence for the reading-induced neural competition theory from a maturational perspective in Chinese cohorts.