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left hand speech final

Terms in this set (62)

1
The Latin word sinister comes from the phrase "on the left side"
2
Why has left handedness been associated with evil or darkness and why are people left-handed in the first place?
3
Left Handedness has had a large impact on society through the statistics and frequency of left-handedness, competitive and cooperative pressures, and the negative impacts of left handedness.
4
Moreover, throughout history left handedness has remained a consistent minority in all societies to varying degrees.
5
90% of people preferring to use the right hand for many tasks, and 10% the left hand.
6
Hand preference becomes established within the first two years of life, but prenatal observations using ultrasound scanning have indicated an earlier initiation of the trait
Gene expression analysis has revealed left-right differences in the human central nervous system as early as four weeks post conception.
7
Animals like humans also have "handedness" but it is more even split between left and right dominance.
8
Left handedness also varies with gender
9
Males more likely to be left-handed than females
10
The male to female odds ratio of left handedness was 1.23.
11
It is still unknown why more men are left-handed- although many have suggested scientific and genetic factors as the cause.
12
In a study from the National Library of Medicine left handedness in men and women appeared differently,
13
in a high preforming study left-handed women performed better on visuospatial tasks while left-handed men performed better on verbosequential tasks.
14
There are also numerous catalysts for left-handedness
15
Handedness appears to be related to differences between the right and left hemispheres of the brain.
16
Birthweight, being part of a multiple birth, and the season of birth can impact handedness.
17
However, twins have a higher likelihood of having different handedness
18
Year of birth and country of birth surprisingly also had an impact on handedness
19
In a study from Wales, the highest likelihood of left handedness was females born in the summer.
20
A recent study found that gene activity in the spinal cord while someone is in the womb, could be a direct cause of handedness.
21
Additionally, in human history, competitive pressures and cooperative pressures have influenced left handedness, as well as a left-handed combat advantage.
22
In competitive societies there are higher rates of left handedness
23
Left handedness gave fighters an advantage when hand-to-hand combat was a means of survival.
24
Left handedness tends to grow in a population until the advantage of left handedness disappears.
25
In societies with more cooperation, more members will tend to be on one side. In countries and societies with high rates of cooperation, there are lower rates of left handedness.
26
Having the same dominant hand would also come in handy for the sharing of tools.
27
Cooperation in societies keeps the left-handed population in the minority.
28
Even though our society today is not based around hand-to-hand combat for survival, there remains a consistent 10% due to continual cooperative and competitive pressures.
29
Left handers can also experience a combat advantage in sports
30
Left-handed individuals are over presented in combat sports, even though they make up only 10% of the population.
31
Rick Nauert from Psych Central says that "physical competition favors the unusual."
32
Left handers have an advantage due to their opponents not being able to anticipate their movement and formulate strategies to combat it.
33
1/3 of Major League Baseball players are left-handed.
34
20 percent of the top-ranked boxers are
35
As well as 20-25 percent of the top-ranked fencers.
36
There is only a left-hand advantage in sports were here is direct contact with an opponent
37
For example, there is no left-hand advantage in golf
38
Likewise, according to an Article from Science.com, left-handers are also at an advantage in time constrained sports due to less time to compensate for the different playing style.
39
Finally, Left-Handed induvials have been met with negative effects and societal confirmative pressures throughout history
40
There is a association between left handedness and some disorders
41
A 2011 study from the American College of Chest Physicians suggested that left handers have significantly higher chances of developing periodic limb movement disorder (PLMD)
42
In a study with patients that have psychotic disorders like schizophrenia and schizoaffective disorder, 40 percent of the patients reported writing with their left hand.
43
A study from the British Journal of Cancer suggested that women with a dominant left hand have a higher risk of being diagnosed with breast cancer than women with a dominant right hand.
44
Link to left handedness and learning disorders
45
In contrast, research shows that left handers may have a lower risk of developing ulcers and arthritis
46
And may recover from strokes faster
47
Left-handed people suffer accidents more frequently
48
A Canadian study found that 52% of college students who were left-handed had accidental injuries that needed medical attention, compared to 36% of right-handed people in the last two years.
49
Left-handed people are also 4.9 times more likely to an amputating injury than right handers
50
Society- including tools have been made for the right-handed majority of the population
51
Left handers often experience discomfort and injury from right-handed scissors
52
Kitchen knives and other kitchen appliances also have a right-hand bias
53
Many electronic items such as keyboards and mouses have this bias
54
Although, new products have been created to cater to left-handed induvials, such as special left-handed cameras.
55
Historically, left handedness was seen as being witchcraft and evil and many people were forced to switch dominant hands, such as former U.S. president Harry S. Truman
56
This practice of switching handedness continues in some parts of the world.
57
In China, 1% percent of the population is reported to be left-handed, as many students were forced to switch
58
In many cultures, the right hand is seen as clean and the left is not, so being left-handed could be seen as disrespectful.
59
The forced switch of handedness can have negative effects such as learning disorders and speech disorders
60
The forced use of the right hand can also have a long-term impact in changing the structure of some parts of the brain.
61
In conclusion, left handedness has had a large impact in human history through the statistics and frequency of left-handedness, competitive and cooperative pressures in society, and the negative effects associated with left handedness.
62
So, do you think left handedness is evil or an unusual advantage?
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