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Related Concept Videos

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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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
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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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Cognitivism01:17

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Cognitive psychology emerged as a significant field in the mid-20th century. It focused on understanding humans' internal mental processes. This approach emphasizes how people perceive, remember, think, and solve problems—elements critical to human cognition.
Previously dominated by behaviorism, which prioritized observable behaviors and largely ignored mental processes, psychology transformed in the 1950s. Cognitive psychologists argue that understanding how we think and process...
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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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Lobes of the Cerebrum01:22

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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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Related Experiment Video

Updated: Apr 27, 2026

Multiscale Investigations of Cortical Processing by Integrating Laminar Polytrodes and Optogenetics with Micro Electrocorticography in Rodents
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Development and evolution of cortical fields.

Yoko Arai1, Alessandra Pierani1

  • 1Institut Jacques Monod, CNRS UMR 7592, Université Paris Diderot, Sorbonne Paris Cité, 75205 Paris Cedex, France.

Neuroscience Research
|July 2, 2014
PubMed
Summary
This summary is machine-generated.

The mammalian neocortex expanded significantly during evolution. Core genetic mechanisms conserve fundamental brain area allocation and wiring, despite functional divergence, guiding neurogenesis and patterning.

Keywords:
Cajal–Retzius neuronsCortical areasCortical patterningEvolutionNeurogenesisThalamo-cortical afferents

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Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Developmental Biology

Background:

  • The neocortex, crucial for complex cognitive functions, has undergone significant relative size expansion during mammalian evolution.
  • Neocortical development involves coordinated progenitor cell growth and patterning, with environmental factors influencing functional area consolidation.
  • Evolution has led to increased sophistication and number of cortical areas, particularly in primates, potentially driving functional complexification.

Purpose of the Study:

  • To discuss fundamental molecular mechanisms orchestrating neurogenesis and arealization in the developing neocortex.
  • To highlight conserved genetic mechanisms underlying cortical area allocation and wiring across species.
  • To review the role of Cajal-Retzius neurons in neocortical development and arealization.

Main Methods:

  • Elucidation of basic molecular mechanisms, including morphogen-dependent pathways, from studies in rodent models.
  • Comparative analyses across different species to understand evolutionary molecular mechanisms of cortical patterning.
  • Review of recent research on Cajal-Retzius neurons as migrating signaling units involved in arealization.

Main Results:

  • Fundamental mechanisms for cortical area allocation and wiring are conserved across species, despite functional divergence.
  • Morphogen-dependent pathways play a key role in the precise orchestration of neurogenesis in distinct cortical areas.
  • Cajal-Retzius neurons are implicated as signaling units involved in neocortical arealization.

Conclusions:

  • Conserved core genetic mechanisms govern neocortical area development and connectivity, providing a foundation for evolutionary expansion.
  • Understanding these molecular mechanisms is crucial for comprehending the evolution of complex brain structures.
  • Further research into Cajal-Retzius neuron function and comparative analyses will refine our understanding of neocortical evolution.