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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:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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Cerebrum: Anatomical Overview II01:11

Cerebrum: Anatomical Overview II

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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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Cerebrum: Anatomical Overview I01:26

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The main and largest component of the human brain is the cerebrum. The cerebrum consists of two main parts: the cerebral cortex, an outer layer with wrinkles or folds known as gyri and shallow grooves called sulci, and a deeper region beneath it. The cerebrum divides into two distinct hemispheres and contains five different lobes: the frontal, parietal, temporal, occipital, and insula. The central sulcus separates the frontal and parietal lobes and two functionally important gyri — the...
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Anatomy of the Brain: Major Regions01:20

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The brain is the most complex organ in the human body. It consists of four main parts: the cerebrum, diencephalon, cerebellum, and brainstem.
The cerebrum is the largest section of the brain and divides into left and right hemispheres, separated by a deep fissure. The cerebral outer layer of grey matter — the cerebral cortex — comprises elevations called gyri and shallow groves called sulci. The inner portion of white matter includes long nerve fibers known as axons, which connect...
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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.
Frontal lobe
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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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Related Experiment Videos

Human frontal lobes are not relatively large.

Robert A Barton1, Chris Venditti

  • 1Evolutionary Anthropology Research Group, Department of Anthropology, Durham University, Durham DH1 3LE, United Kingdom. r.a.barton@durham.ac.uk

Proceedings of the National Academy of Sciences of the United States of America
|May 15, 2013
PubMed
Summary

Human brain evolution did not involve disproportionate frontal lobe enlargement. Analysis shows frontal lobe size is expected relative to other brain structures, challenging prior assumptions about human cognitive uniqueness.

Keywords:
cognitionprefrontal cortexprimates

Related Experiment Videos

Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Comparative Anatomy

Background:

  • A long-standing assumption in human brain evolution posits relative enlargement of the frontal lobes.
  • This assumption has guided research into the neural basis of human cognitive abilities.

Purpose of the Study:

  • To critically re-evaluate the assumption of relative frontal lobe enlargement in human brain evolution.
  • To investigate evolutionary rates of change in frontal lobe size across primate lineages.

Main Methods:

  • Analysis of five independent datasets using correctly scaled measures.
  • Application of phylogenetic methods to compare brain structure sizes across species.
  • Utilizing a novel method to detect shifts in evolutionary rates.

Main Results:

  • Human frontal lobe size, including specific regions, is proportional to other brain structures, contrary to previous claims.
  • Relative enlargement of frontal white matter and shared enlargement in great apes appear to be mistaken findings.
  • Evolutionary rates of change in relative frontal cortex volume in the human lineage were not exceptional; other branches exhibited faster rates.

Conclusions:

  • The relative enlargement of frontal lobes is not a unique feature of human brain evolution.
  • Human cognitive uniqueness likely arises from distributed neural networks rather than isolated frontal lobe expansion.
  • Future research should focus on interconnected brain systems for understanding human cognition.