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Related Concept Videos

Lateralization01:28

Lateralization

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.
Cerebral Hemispheres01:05

Cerebral Hemispheres

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...
Prochirality02:05

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
Types of Hypothesis Testing01:11

Types of Hypothesis Testing

There are three types of hypothesis tests: right-tailed, left-tailed, and two-tailed.
When the null and alternative hypotheses are stated, it is observed that the null hypothesis is a neutral statement against which the alternative hypothesis is tested. The alternative hypothesis is a claim that instead has a certain direction. If the null hypothesis claims that p = 0.5, the alternative hypothesis would be an opposing statement to this and can be put either p > 0.5, p < 0.5, or p ≠ 0.5.

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Related Experiment Video

Updated: May 25, 2026

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
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Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury

Published on: March 21, 2025

Understanding left-handedness.

Stefan Gutwinski1, Anna Löscher, Lieselotte Mahler

  • 1Klinik für Psychiatrie und Psychotherapie, Charité – Universitätsmedizin Berlin, Campus Charité Mitte, Grosse Hamburger Str. 5–11, 10115 Berlin, Germany. stefan.gutwinski@charite.de

Deutsches Arzteblatt International
|January 20, 2012
PubMed
Summary
This summary is machine-generated.

Handedness, or cerebral lateralization of motor processes, emerged early in human evolution and may underpin speech and fine motor skills. While advantageous, certain handedness types are linked to disease.

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Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Genetics

Background:

  • The human cerebrum exhibits asymmetry, with distinct functions lateralized to each hemisphere.
  • Cerebral lateralization of motor processes, including handedness, is increasingly understood through recent research.
  • This article reviews findings on handedness development from a medical viewpoint.

Purpose of the Study:

  • To synthesize current understanding of handedness and cerebral lateralization.
  • To explore the evolutionary and medical implications of handedness.
  • To provide an overview of handedness from epidemiological, neurobiological, and medical perspectives.

Main Methods:

  • A systematic literature search was conducted using PubMed.
  • Keywords included "handedness," "left handedness," "right handedness," and "cerebral lateralization."
  • Analysis focused on highly ranked and commonly cited articles.

Main Results:

  • Handedness likely emerged early in evolution and is fundamental to higher cognitive functions.
  • It may have provided the evolutionary basis for speech and fine motor skills crucial for humankind.
  • Potential disadvantages are discussed, noting associations between certain handedness types and disease.

Conclusions:

  • Examining handedness through epidemiological, neurobiological, and medical lenses offers valuable insights into cerebral lateralization.
  • Understanding handedness contributes to comprehending brain asymmetry and its functional significance.