Científicos Industria Argentina - Neurociencia: los hemisferios del cerebro - 08-08-15

Introduction to Neurosciences

In this section, Pedro Beinstein introduces the topic of neuroscience and its relevance. He discusses the fascination he and others have with this field of science.

The Myth of Left Brain vs Right Brain Dominance

• There is a common belief that personality traits are associated with the dominance of either the left or right hemisphere of the brain.

• The brain is divided into two hemispheres, which are connected by the corpus callosum.

• Communication between the hemispheres occurs through this connection.

• However, this belief is a myth and lacks scientific evidence.

Origins of the Left Brain vs Right Brain Myth

Pedro Beinstein explains how the myth originated in the 1850s when Paul Broca, a French doctor, studied a patient with language production difficulties. This led to misconceptions about brain dominance and gender stereotypes.

Paul Broca's Discovery

• Paul Broca studied a patient named Tan who had difficulty producing language and could only say "tan."

• After Tan's death, it was discovered that he had a lesion in a specific area of his left hemisphere called Broca's area.

• This finding led to the belief that language processing is primarily located in the left hemisphere.

Gender Stereotypes and Misinterpretations

• The misconception about brain dominance quickly led to gender stereotypes, where men were considered more rational (left-brain dominant) and women more emotional (right-brain dominant).

• These interpretations were based on assumptions about language being a rational capacity exclusive to humans.

• However, these beliefs are not supported by scientific evidence.

Debunking the Left Brain vs Right Brain Myth

Pedro Beinstein discusses the experiments conducted by Rogers Perry and Michael Gazzaniga, which involved patients with epilepsy who underwent surgery to sever the corpus callosum. The results showed that brain dominance does not determine personality traits.

Corpus Callosum Surgery

• Patients with severe epilepsy underwent surgery to cut the corpus callosum, severing communication between the hemispheres.

• If brain dominance determined personality traits, cutting this connection should have resulted in observable changes.

Lack of Personality Changes

• Despite the severed connection between hemispheres, patients' personalities remained unchanged.

• Their intelligence quotient (IQ) also remained unaffected.

• This experiment provided strong evidence against the left brain vs right brain myth.

Conclusion and Implications

Pedro Beinstein concludes that while language processing is primarily located in the left hemisphere, it does not determine personality traits. The myth of left brain vs right brain dominance has been debunked through scientific experiments.

Language Processing and Personality Traits

• Language processing is predominantly located in the left hemisphere of the brain.

• However, this localization does not imply that personality traits are determined by brain dominance.

• Scientific evidence shows that there is no direct correlation between brain dominance and personality traits.

Importance of Understanding Brain Function

• It is crucial to dispel myths and misconceptions about brain function to avoid misinterpretations and stereotypes.

• Understanding how different areas of the brain contribute to various functions can lead to more accurate knowledge and strategies for education and personal development.

The Brain's Hemispheres and Visual Perception

In this section, the experiment conducted to understand the relationship between the brain's hemispheres and visual perception is discussed.

Dividing the Visual Field

• The experiment involved dividing the visual field using a partition.

• The left hemisphere of the brain controls the right side of the body, while the right hemisphere controls the left side.

• When an object was shown on the right side, it could be named by the participant. However, if it was shown on the left side, communication between hemispheres prevented naming.

Further Experimentation

• In another experiment with a patient named PS, different images were shown to each hemisphere.

• The left hemisphere was shown a picture of a chicken, while the right hemisphere saw a house with a snowy landscape.

• PS was then asked to match cards with drawings to each image. He correctly matched the chicken image with a card depicting a chicken leg and associated it with cleaning out a chicken coop using a shovel.

Interpretation by Each Hemisphere

• When asked why he made those associations, PS explained that it was logical for him to connect the chicken leg with chickens and associate shovels with cleaning their coop.

• This led Michael Gazzaniga, who conducted these experiments, to conclude that each hemisphere interprets what it sees in its own way and invents stories or explanations based on its limited knowledge.

Confabulation and Neuroscience

This section explores confabulation and its connection to neuroscience.

Confabulation Explanation

• Confabulation refers to when one hemisphere invents explanations or stories due to its lack of awareness about what has been perceived by another hemisphere.

• Pedro Beckenstein discusses this phenomenon in relation to neuroscience.

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