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Related Concept Videos

Cerebral Hemispheres01:05

Cerebral Hemispheres

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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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Cerebrum: Anatomical Overview II01:11

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Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
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Lateralization01:28

Lateralization

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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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Association Areas of the Cortex01:21

Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Encoding01:19

Encoding

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Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
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Somatosensory, Motor, and Association Cortex01:23

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Related Experiment Video

Updated: Mar 17, 2026

Creating Objects and Object Categories for Studying Perception and Perceptual Learning
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Category Membership and Semantic Coding in the Cerebral Hemispheres.

Casey E Turner, Ronald T Kellogg

    The American Journal of Psychology
    |July 19, 2016
    PubMed
    Summary

    This study investigated semantic category processing in the brain. Results show the right hemisphere processes category gradients differently than the left, suggesting distinct cognitive functions.

    Area of Science:

    • Cognitive Neuroscience
    • Psycholinguistics
    • Neuroscience

    Background:

    • Semantic categories possess an internal gradient of membership, with typical items more central than peripheral ones.
    • Previous research has yielded mixed results regarding hemispheric differences in processing this category gradient.

    Purpose of the Study:

    • To empirically investigate whether the left and right brain hemispheres process semantic category gradients differently.
    • To explore alternative theoretical interpretations of observed hemispheric differences in semantic processing.

    Main Methods:

    • Two experiments were conducted where participants categorized words presented to either the left visual field/right hemisphere or right visual field/left hemisphere.
    • Stimuli included category names and either closely or distantly related words to assess typicality effects and category boundaries.

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    Related Experiment Videos

    Last Updated: Mar 17, 2026

    Creating Objects and Object Categories for Studying Perception and Perceptual Learning
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    Main Results:

    • Distantly related words were categorized slower in the right hemisphere (LVF/RH) compared to the left hemisphere (RVF/LH).
    • No significant difference in categorization speed was observed for words close to the category prototype.
    • Both hemispheres demonstrated consistent category boundaries when evaluating items near the fuzzy border of category membership.

    Conclusions:

    • The findings reveal a distinct typicality effect in the right hemisphere, indicating a specialized role in processing the gradient of semantic category membership.
    • The consistent category boundaries across hemispheres suggest shared mechanisms for defining category limits.
    • The results favor a processing explanation over a structural one for observed hemispheric differences in semantic categorization.