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Left-handedness
Advantages of being Left-handed and Consequences of
Reeducation
Outline
1. What is Handedness?
2. The Struggle of being Left-handed
3. Advantages of being Left-handed
4. Consequences of Reeducation
What is Handedness?
“
”
The tendency to use either the right or the left hand more
naturally than the other.
Oxford Dictionaries (online)
Handedness and Brain Lateralization
• Human brain composed of
two halves
• Different specializations
• One half – more active than
the other
LEFT HEMISPHERE RIGHT HEMISPHERE
LANGUAGE FANTASY
SCIENCE EMOTIONS
LOGIC CREATIVITY
MATHEMATICS PERCEPTION
RIGHT HAND CONTROL LEFT HAND CONTROL
Types of Handedness
• Right-handedness
• Left-handedness
• (Mixed-handedness)
• (Ambidexterity)
10%
90%
World Population
Left-handed Right-handed
The Struggle of being Left-handed
• Writing – smudges
• Scissors – repetitive strain
injury
• School desks – no arm rest
The Struggle of being Left-handed
• Interpersonal actions
• Dangerous power tools
• Life expectancy
• 2,500/year killed from using
equipment meant for right-
handed people
Advantages of being Left-handed
• Sports
• Advantage: better spatial
perception
• E.g. boxing, tennis, table tennis,
fencing
Advantages of being Left-handed
• Creativity
• Dominance of brain‘s right
hemisphere: fantasy, emotions,
perception, music, art etc.
• Backwards writing/reading
• Right to left – natural direction
for left-handers
Advantages of being Left-handed
• Adaptability
• World dominated by right-
handed people
• Lefties get used to it
• It‘s cool to be different!
Consequences of Reeducation
Consequences of Reeducation
• traditional/cultural reasons
• E.g. in Islamic countries – left-handedness: stigma
• Germany until 1970s – reeducation of left-handed preschoolers
Consequences of Reeducation
• Fatal consequences
• Mental issues
• Memory defects and speech
disorders
• Bedwetting
• Inner conflict
Summary
• Reason for handedness: different partial activeness of the human brain
• Different types of handedness
• Right-handedness
• Left-handedness
• (Mixed-handedness)
• (Ambidexterity)
Summary
• Due to right-handed domination (90%), left-handers confronted
with problems, awkwardness and even danger
• But: many advantages e.g. in sports, creativity, perception,
adaptability
Summary
• Left-handedness – negative in many cultures
• Reeducation brings fatal consequences
• “left-hander in a right-hander’s body”
Thank you for your attention!
(Do not miss Left-Handers Day, August 13th!)
Sources
• Markowitsch, Hans J., Klinische Neuropsychologie, Göttingen : Hogrefe Verl. für
Psychologie, 1997
• Zuckrigl, Alfred, Linkshändige Kinder in Familie und Schule, München : E.
Reinhardt, 1986
• Kalilich, Jordon, “Being Left-Handed”, http://www.theworldofstuff.com/lefty/
(collected 8/6/2014)

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Left-Handedness

  • 1. Left-handedness Advantages of being Left-handed and Consequences of Reeducation
  • 2. Outline 1. What is Handedness? 2. The Struggle of being Left-handed 3. Advantages of being Left-handed 4. Consequences of Reeducation
  • 4. “ ” The tendency to use either the right or the left hand more naturally than the other. Oxford Dictionaries (online)
  • 5. Handedness and Brain Lateralization • Human brain composed of two halves • Different specializations • One half – more active than the other LEFT HEMISPHERE RIGHT HEMISPHERE LANGUAGE FANTASY SCIENCE EMOTIONS LOGIC CREATIVITY MATHEMATICS PERCEPTION RIGHT HAND CONTROL LEFT HAND CONTROL
  • 6. Types of Handedness • Right-handedness • Left-handedness • (Mixed-handedness) • (Ambidexterity) 10% 90% World Population Left-handed Right-handed
  • 7. The Struggle of being Left-handed • Writing – smudges • Scissors – repetitive strain injury • School desks – no arm rest
  • 8. The Struggle of being Left-handed • Interpersonal actions • Dangerous power tools • Life expectancy • 2,500/year killed from using equipment meant for right- handed people
  • 9. Advantages of being Left-handed • Sports • Advantage: better spatial perception • E.g. boxing, tennis, table tennis, fencing
  • 10. Advantages of being Left-handed • Creativity • Dominance of brain‘s right hemisphere: fantasy, emotions, perception, music, art etc. • Backwards writing/reading • Right to left – natural direction for left-handers
  • 11. Advantages of being Left-handed • Adaptability • World dominated by right- handed people • Lefties get used to it • It‘s cool to be different!
  • 13. Consequences of Reeducation • traditional/cultural reasons • E.g. in Islamic countries – left-handedness: stigma • Germany until 1970s – reeducation of left-handed preschoolers
  • 14. Consequences of Reeducation • Fatal consequences • Mental issues • Memory defects and speech disorders • Bedwetting • Inner conflict
  • 15. Summary • Reason for handedness: different partial activeness of the human brain • Different types of handedness • Right-handedness • Left-handedness • (Mixed-handedness) • (Ambidexterity)
  • 16. Summary • Due to right-handed domination (90%), left-handers confronted with problems, awkwardness and even danger • But: many advantages e.g. in sports, creativity, perception, adaptability
  • 17. Summary • Left-handedness – negative in many cultures • Reeducation brings fatal consequences • “left-hander in a right-hander’s body”
  • 18. Thank you for your attention! (Do not miss Left-Handers Day, August 13th!)
  • 19. Sources • Markowitsch, Hans J., Klinische Neuropsychologie, Göttingen : Hogrefe Verl. für Psychologie, 1997 • Zuckrigl, Alfred, Linkshändige Kinder in Familie und Schule, München : E. Reinhardt, 1986 • Kalilich, Jordon, “Being Left-Handed”, http://www.theworldofstuff.com/lefty/ (collected 8/6/2014)