Many psychologists, professors and other researchers have studied the mechanism and explanation of having a left-handed trait among a few individuals. The brain hemisphere division of labor is the most accepted theory about the left-handedness of a person. (Broca, 1960) proposed that the handedness of a person can be associated by the brain hemisphere division of labor. The brain is divided into two hemispheres which are the right and left hemisphere. Each of the hemispheres has their different functions in our body. The right hemisphere of the brain is its creative side. The functions of right hemisphere of the brain are more on the visual and include some abilities such as face recognition and visual imagery. However, the left hemisphere …show more content…
The gens that can be determine are the gene D which means dextral and gene C for chance. A theory called Dextral and Chance theory was proposed to prove the genes that can determine the handedness of a person. The gene D is associated by the right hand which can control the speech process in the left hemisphere of the brain as stated in the brain hemisphere division of labor. The gene C is concluded as neutral. In the genotype DD, it will produce strongly right-handed offsprings, the heterozygous DC will produce a 25% of left-handed and 75% of right-handed, while the CC will produce a mixture of 50% left-handed and 50% right-handed individuals (McManus, 1992). Based on the statistics given, the right handedness is most dominant and likely to appear to other people. This theory only proposes that the minority of the individuals has a gene C which gives the trait of …show more content…
It was stated that the brain hemisphere can be associated with the handedness of a person where the right hemisphere of the brain controls the left side of the body. Therefore, pathological theories conclude that the left-handed people are just brain-damage right handed individuals. With this theory, it was assumed that the right-handedness is basically the natural trait of a person and due to some stressors and physical trauma, the effect will be the left-handedness. During pregnancy, if the child’s right side of the brain which controls the left side of the body gets damage, then the right-handedness of the child will remain. However, if the left side of the brain gets damage, the brain’s plasticity will transfer the movement in the right hemisphere of the brain which can causes the left-handedness of the
In the 1950s and 1960s Edgar Zwilling and John Saunder did experiments on chicken eggs to uncover how the skeleton is formed. They discovered that two patches of tissue essentially control the development of limbs. Neil explains to us that the patch of tissue that makes the pinky side different from the thumb side is called the zone of polarizing activity or ZPA. Later, geneticists working with flies discovered a gene they called hedgehog. This gene controlled which end of the fly was which.
It sends information for sleep, hearing, taste, and even eye movement. Corpus Callosum: The corpus callosum connects both hemispheres of the brain and allows them to relay messages between one another. People who have a severed corpus callosum can essentially function as 2 different people at the same time, with the left half of their body performing one task, and the right half another. Frontal Lobe: As the largest lobe in our brain, this lobe play a significant role in personality and impulse control.
Mayella's bruises showed mostly on the right side of her face. Commonly, if an attacker’s left hand is their dominant, they’d strike mostly on the right side, and vice versa. Tom’s left hand wouldn’t be able to cause so much damage, like the black eye found on her right side. If Tom’s not the attacker because he’s right handed, then who’s the left handed assailant? Bob Ewell was asked to write his name on a paper during the trial, he was found to be left handed.
Forebrain #3 The section I chose is the forebrain which controls the higher functions of the brain, such as thinking, decision making, and dreaming. I chose forebrain #3 which consists of the occipital lobes, parietal lobes, and the somatosensory cortex. The occipital lobes is the visual processing center of the brain containing most of the region of the visual cortex. The occipital lobes are involved in many functions including visual perception, color recognition, reading, comprehension, depth perception, and recognition of object movement.
They then conducted fishing experiments in order to research the connection between body asymmetry and predatory behavior. They used the position of the hook set in the mouth to show the direction the fish was moving in when it took the bait. Righty fish had more hooks set on the right side, whereas lefty fish had more on the left
The right side of the brain shows emotion and living in the present. As a man who follows a murderer to his house
In the sixth grade, I took a test to see if I was left- or right-brained. To my elementary eyes, the result of that quiz would be the truth from on high—a resolute word that would define the man to come as either analytic or artistic. Unfortunately, the oracle I sought gave me a perplexing answer. Much to my disbelief, my tallied score yielded a perfect split down the middle. Was I mentally ambidextrous or mentally challenged?
Another factor that is affected by genes is one's’ personality. Scientists have studied many sets of twins and came to the conclusion that personality is based on five traits: agreeableness, openness, conscientiousness, neuroticism, and how extraverted a person is (Bouchard). Recently in my psychology class, my professor mentioned a story that I found very interesting. She told us that researchers found that identical twins who were separated at birth, still developed the same likes and dislikes, dressed the same, and were interested in the same career paths. This suggests that a large part of a person’s personality is genetic.
If a dog is left pawed, it was recorded that they were more aggressive toward strangers than right pawed or ambilateral dogs.
In the book "My stroke of insight," by Jill Bolte Taylor, Ph.D., was a neuroanatomist who personal experience after suffering from a stroke herself. Jill suffered a hemorrhagic stroke in the left hemisphere. Taylor stated, "The type of stroke I experienced was a severe hemorrhage in the left hemisphere of my brain due to an undiagnosed AVM (Taylor, 2006, 22-23). Jill goes on to explain the different thoughts she encountered and how difficult it was before calling for help.
The individual is to lay their hands flat on the board with their wrist aligned with the edge of the board and adjust the slides according to their fingertips to attain accurate measures rather than tracing the 2D and 4D digits (George, 1930). The results were as follows; males exhibited longer 4D digit than 2D digit while women exhibited longer 2D digit than 4D digit (George, 1930). The two studies had shown that in fact a difference in the ratio of 2D/4D digits between men and women exists which further answers the question of whether this ratio can be considered a sexually dimorphic trait. However, further studies would need to be conducted in order to examine the causes responsible for this diversity, and how this trait can be used to differentiate males and women in terms of physical, cognitive and intellectual
This suggestion works in accordance to the evidence that suggests that the brain is predisposed to have certain areas specifically designed for language processing and development. For example, Gazzaniga (1986) stated that language processing occurs in the left hemisphere of the
This phenomenon is caused by differences in portion of the splenium, which enables the connections between the two sides of the brain. Simultaneously, this is why women seem to be more emotional, and men being more logical, as men are less active in the right side of the brain than those of the female gender. “Men are more violent than women.” this is a phrase that most people seem to agree with.
In fact, I am surprisingly capable of visualizing my chemistry classes just by listening to the lecture of the day. It is why I’ve always been fascinated by science. On the other hand, I can’t seem to watch Casper the friendly ghost until I was 14. Lefties also seem to have a better chance of having a high IQ, or being considered a genius. Twenty percent of all Mensa members say they are left-handed, and among the famous “smart” lefties: Charles Darwin, Albert Einstein, Benjamin Franklin, and Isaac Newton.
Your left side tells what your right side to do and it also help with mathematics and science and other stuff while your right side of your brain tell the left side of the body what to do along with being your artistic side. When you learn cursive it helps both of those sides of your brain work together. So when you’re in school and doing your homework and you’re bored when you finish your homework try and learn cursive once you get the hang of it its quite easy it might help your left and right side of the brain work together to help you do your homework creatively you could do it creatively on a loose leaf piece of paper when your done put the answers on your homework sheet and BAM you’re done. Maybe you don’t get something on your homework well with both sides of your brain working together you could find a creative way to Rember it.