The Naked Scientists
  • Login
  • Register
  • Podcasts
      • The Naked Scientists
      • eLife
      • Naked Genetics
      • Naked Astronomy
      • In short
      • Naked Neuroscience
      • Ask! The Naked Scientists
      • Question of the Week
      • Archive
      • Video
      • SUBSCRIBE to our Podcasts
  • Articles
      • Science News
      • Features
      • Interviews
      • Answers to Science Questions
  • Get Naked
      • Donate
      • Do an Experiment
      • Science Forum
      • Ask a Question
  • About
      • Meet the team
      • Our Sponsors
      • Site Map
      • Contact us

User menu

  • Login
  • Register
  • Home
  • Help
  • Search
  • Tags
  • Member Map
  • Recent Topics
  • Login
  • Register
  1. Naked Science Forum
  2. General Science
  3. Question of the Week
  4. Qotw 14.02.17 - Why do we have handedness?
« previous next »
  • Print
Pages: [1]   Go Down

Qotw 14.02.17 - Why do we have handedness?

  • 5 Replies
  • 10458 Views
  • 0 Tags

0 Members and 1 Guest are viewing this topic.

Offline thedoc (OP)

  • Forum Admin
  • Hero Member
  • *****
  • 510
  • Activity:
    0%
  • Thanked: 17 times
    • View Profile
Qotw 14.02.17 - Why do we have handedness?
« on: 20/02/2014 15:57:47 »
Why are people either right-handed or left-handed? What possible benefit does that have over being ambidextrous? I find I am right-handed, right-footed, and even right-eyed! When I wore single-muff headsets on my job, though, I preferred them on my left ear and not my right, so that's a bit of a question.

And, do animals also display handedness?

Thank you.
Ken Silva
Laveen, AZ
USA


Asked by Kenneth Silva


                                        Visit the webpage for the podcast in which this question is answered.

 

« Last Edit: 11/03/2014 12:21:10 by chris »
Logged
 



Offline thedoc (OP)

  • Forum Admin
  • Hero Member
  • *****
  • 510
  • Activity:
    0%
  • Thanked: 17 times
    • View Profile
Why do we have "handedness"?
« Reply #1 on: 20/02/2014 15:57:47 »
We answered this question on the show...

Transcript to follow...
« Last Edit: 20/02/2014 15:57:47 by _system »
Logged
 

Offline athemyahba

  • First timers
  • *
  • 1
  • Activity:
    0%
    • View Profile
Re: Why do we have \
« Reply #2 on: 08/02/2014 17:08:28 »
I believe it could be possible due to the genes in one's body where one is more dominant than the other. In humans probably the right one is more dominant than the left one which leads to most people being right handed.


Another reason could be that because most people have the general perception that everyone writes with right hand therefore when they teach their kids to write they make sure that the kids hold the pencils/pens in their right hands. If the kid switches over to the left hand most parents will observe for a short time and then after watching that there is no improvement will encourage the kid to switch back to the right hand. Also most day to day activities demand the kid to use it's right hand like using a mouse etc. Eventually over time the kid has more practice of using his right hand that he probably becomes right handed.
Logged
 

Offline Focused_science

  • First timers
  • *
  • 3
  • Activity:
    0%
    • View Profile
Re: Why do we have \
« Reply #3 on: 11/02/2014 20:07:07 »
the left side of the brain is known to control the right side of the body, but it's also known as the side to control logic and "smartness", while the right side is known to be "artistic". Because of this more right handed people are known to be smarter because when they use that hand (or side of body) they activate the movement functions in the left side of your brain.
Logged
 

Offline alancalverd

  • Global Moderator
  • Naked Science Forum King!
  • ********
  • 6910
  • Activity:
    51.5%
  • Thanked: 421 times
  • life is too short to drink instant coffee
    • View Profile
Re: Why do we have
« Reply #4 on: 12/02/2014 16:08:49 »
IIRC the number of lefties in the UK has been increasing since the 1950s, when primary schools stopped insisting on rigththanded writing, sinistral tools (particularly scissors) became more generally available, and the Royal and Ancient allowed golfers to use lefthanded clubs.

We now know that sinistral CEOs and the like earn significantly more than their dextral counterparts in practically every industry, and indeed the frequency of lefthandedness among  CEOs is much higher than among the genral population.

AFAIK genetics doesn't usually work at the "5 - 10% level".  Significant genetic effects in most mammals are either 50-50 (male/female ratio)  or "very rare". So my hypothesis  is that 50% of the human race cannot be lefthanded, due to a minor genetic defect associated with the exceptional demands placed on the human brain and nervous system by walking upright and having an enormous and very subtle vocabulary. This is supported by the fact that apes and to some extent dogs (a species that responds to subtle human expressions) and some birds (which have remarkably wide vocabularies) appear to be handed.

Society copes with the inherent disability of dextrals by decreeing that life will in general be dextral and the other 50%, mostly born ambidextrous, have a choice. This then only disadvantages the very few who are genetically predisposed to lefthandedness. Of the 50% ambis, it is reasonable to assume that half will "go with the flow" leaving about 25% who choose to be different, and the trend seems to be towards this number when social restrictions are abandoned.

The observed high incidence of lefthandedness among scientists, mathematicians, artists and composers (but not musicians - lefthanded saxophones are rare, and a leftie violinist is a health and safety hazard in an orchestra) seems to correlate with notions of originality and abstract thought.   

The universal availability of toilet paper also has a lot to do with it.
Logged
helping to stem the tide of ignorance
 



Offline cheryl j

  • Naked Science Forum King!
  • ******
  • 1478
  • Activity:
    0%
  • Thanked: 6 times
    • View Profile
Re: Why do we have
« Reply #5 on: 13/02/2014 17:27:48 »
One theory is that the degree of left or right domination in  a species has to do with the whether a species is more cooperative or competitive, or has a kind of mixed strategy. Essentially, there is often an advantage to being different handed than your enemy, but same handed as your friend, and the researchers use professional sports like baseball as an example of this.

http://www.northwestern.edu/newscenter/stories/2012/04/left-handed-minority.html
Logged
 



  • Print
Pages: [1]   Go Up
« previous next »
Tags:
 

Similar topics (5)

QotW - 15.08.24 - Why do major keys sound happy and minor keys sound mournful?

Started by thedocBoard Question of the Week

Replies: 10
Views: 8113
Last post 05/04/2018 03:06:55
by Monox D. I-Fly
QotW - 08.04.06 - Better to drink wine than to drink nothing?

Started by thedocBoard Question of the Week

Replies: 24
Views: 31864
Last post 07/04/2018 12:49:50
by Bored chemist
QotW - 18.08.02 - Why are non-stick pans non-stick?

Started by Adam MurphyBoard Question of the Week

Replies: 4
Views: 1403
Last post 11/08/2018 17:51:43
by wolfekeeper
QotW - 10.03.28 - Is a human bite worse than a dog bite?

Started by thedocBoard Question of the Week

Replies: 10
Views: 13545
Last post 13/01/2019 09:40:37
by chris
QotW - 11.03.06 - How do pain medications target pain?

Started by thedocBoard Question of the Week

Replies: 7
Views: 12317
Last post 18/01/2018 21:08:11
by evan_au
There was an error while thanking
Thanking...
  • SMF 2.0.15 | SMF © 2017, Simple Machines
    Privacy Policy
    SMFAds for Free Forums
  • Naked Science Forum ©

Page created in 0.156 seconds with 50 queries.

  • Podcasts
  • Articles
  • Get Naked
  • About
  • Contact us
  • Advertise
  • Privacy Policy
  • Subscribe to newsletter
  • We love feedback

Follow us

cambridge_logo_footer.png

©The Naked Scientists® 2000–2017 | The Naked Scientists® and Naked Science® are registered trademarks created by Dr Chris Smith. Information presented on this website is the opinion of the individual contributors and does not reflect the general views of the administrators, editors, moderators, sponsors, Cambridge University or the public at large.