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Related Concept Videos

Anatomy of the Brain: Major Regions01:20

Anatomy of the Brain: Major Regions

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 various areas...
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The brain is an integral component of the nervous system and serves as the center for processing sensory inputs, making decisions, and directing bodily actions. This complex organ is organized into three primary sections: the hindbrain, midbrain, and forebrain, each responsible for a range of vital functions.
Hindbrain
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Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter more...
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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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Evolutionary Psychology

Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...
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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.

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A Comparative Approach for Quantitative Cell Counting Studies in Widely Different Mammalian Brains
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Human brain evolution writ large and small.

Chet C Sherwood1, Amy L Bauernfeind, Serena Bianchi

  • 1Department of Anthropology, The George Washington University, Washington, DC, USA. sherwood@gwu.edu

Progress in Brain Research
|January 11, 2012
PubMed
Summary
This summary is machine-generated.

Human brain evolution saw significant size increases. While brain enlargement explains some neural changes, specific cognitive abilities like language may stem from unique human specializations.

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Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Cognitive Science

Background:

  • Human evolution is characterized by remarkable brain size increase relative to body size.
  • Increased encephalization is crucial for human-specific cognitive abilities.
  • Distinguishing brain size by-products from specialized cognitive functions is challenging.

Purpose of the Study:

  • To review evidence from allometric scaling studies on human neocortical organization.
  • To identify features of human neocortical architecture and function potentially linked to unique cognitive capacities.
  • To address limitations in comparative primate data for neuroanatomical variables.

Main Methods:

  • Analysis of allometric scaling studies in human evolution.
  • Comparative neuroanatomical data review across primate species.
  • Identification of extra-allometric specializations in the human neocortex.

Main Results:

  • Much of human neocortical organization can be explained by brain size expansion.
  • Lack of comparative primate data hinders defining human-specific specializations.
  • Some human neocortical features may not be direct correlates of brain size.

Conclusions:

  • Brain enlargement is a significant factor in human neural organization.
  • Unique human cognitive capacities, such as language and mentalizing, may involve specific neocortical adaptations beyond general brain size increase.
  • Further comparative neuroanatomical research is needed to fully understand human cognitive evolution.