Featured Research

from universities, journals, and other organizations

Understanding left-handedness

Date:
December 27, 2011
Source:
Deutsches Aerzteblatt
Summary:
Left-handedness is sometimes the expression of a genetic defect or an early developmental disturbance.

Left-handedness is sometimes the expression of a genetic defect or an early developmental disturbance. In this issue of Deutsches Δrzteblatt International, Stefan Gutwinski and coauthors present the current scientific understanding of left- and right-handedness.

Left-handedness is found in all cultural groups. It arose early in the course of human evolution and played a key role in the development of higher cognitive functions. Human speech, for example, is thought to have arisen as an outgrowth of the unilateral cerebral control of manual communication by gesticulation. Likewise, it was only after handedness had become well established that very fine motor functions of the human hand could develop.

Most of the time, left-handedness is simply a naturally occurring, normal variant. In some cases, however, it is disadvantageous and may well reflect a genetic defect or early developmental disturbance. Thus, both left-handedness and extreme right-handedness seem to be more common among persons suffering from certain diseases.

This phenomenon can be observed, for example, in epilepsy, schizophrenia, and autism. Furthermore, current research suggests that diminished activity of the left cerebral hemisphere compared to the right may lead to depression, and the opposite imbalance to mania.


Story Source:

The above story is based on materials provided by Deutsches Aerzteblatt. Note: Materials may be edited for content and length.


Journal Reference:

  1. Gutwinski S, Löscher A, Mahler L, Kalbitzer J, Heinz A, Bermpohl F. Understanding left-handedness. Dtsch Arztebl Int, 2011; 108(50): 849%u201353 DOI: 10.3238/arztebl.2011.0849

Cite This Page:

Deutsches Aerzteblatt. "Understanding left-handedness." ScienceDaily. ScienceDaily, 27 December 2011. <www.sciencedaily.com/releases/2011/12/111227092931.htm>.
Deutsches Aerzteblatt. (2011, December 27). Understanding left-handedness. ScienceDaily. Retrieved September 20, 2014 from www.sciencedaily.com/releases/2011/12/111227092931.htm
Deutsches Aerzteblatt. "Understanding left-handedness." ScienceDaily. www.sciencedaily.com/releases/2011/12/111227092931.htm (accessed September 20, 2014).

Share This



More Mind & Brain News

Saturday, September 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Could Grief Affect The Immune Systems Of Senior Citizens?

Could Grief Affect The Immune Systems Of Senior Citizens?

Newsy (Sep. 19, 2014) — The study found elderly people are much more likely to become susceptible to infection than younger adults going though a similar situation. Video provided by Newsy
Powered by NewsLook.com
Food Addiction Might Be Caused By PTSD

Food Addiction Might Be Caused By PTSD

Newsy (Sep. 18, 2014) — New research shows that women who suffer from PTSD are three times more likely to develop a food addiction. Video provided by Newsy
Powered by NewsLook.com
Corporal Punishment on Decline, Debate Renews

Corporal Punishment on Decline, Debate Renews

AP (Sep. 16, 2014) — Corporal punishment in the United States is on the decline, but there is renewed debate over its use after Minnesota Vikings running back Adrian Peterson was charged with child abuse. (Sept. 16) Video provided by AP
Powered by NewsLook.com
FDA Eyes Skin Shocks Used at Mass. School

FDA Eyes Skin Shocks Used at Mass. School

AP (Sep. 15, 2014) — The FDA is considering whether to ban devices used by the Judge Rotenberg Educational Center in Canton, Massachusetts, the only place in the country known to use electrical skin shocks as aversive conditioning for aggressive patients. (Sept. 15) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins