Riya Baibhawi

Left-Handers Have A Different Brain Structure-Does It Make Them Smarter Than Others?

Are left handers smarter?

I am a left-hander. Like most people in this category, my parents initially saw me as different and encouraged me to become right-handed. However, they soon accepted that this was simply who I was. Once the matter was settled, I began receiving comments about my intelligence and verbal skills, often being compared to the right-handed majority. But is there any truth to these claims, or are they just the perception of the majority?

Left-handed people, also known as "lefties" or "southpaws," make up about 10% of the global population. Historically, left-handers were viewed as outcasts. During the Middle Ages, they were even accused of witchcraft and banished from society. As recently as the 20th century, many educators forced left-handed students to retrain their natural tendencies. Even the scientific community believed that left-handedness resulted from minor <span>brain</span> damage during early development.

<h2>All these myths have since been debunked, but what does neuroscience say?</h2>

 Researchers have found that while right-handed people may have slightly higher IQ scores on average, the difference is negligible. In the journal Neuroscience Biobehavioral Rev 2018, a systematic review and meta-analysis of 36 studies involving 66,108 individuals, examined whether handedness influences intelligence. The findings suggest that left-handers and right-handers generally have similar IQ scores. While some studies reported minor statistical differences favoring right-handers, the effect size was too small to be meaningful. Moreover, when the largest study was excluded, the significance disappeared. The analysis also found no IQ differences between right-handers and non-right-handers (including ambidextrous individuals) or between genders.

Moreover, those whose left hand is dominant are better at taking verbal cues. A study published in Brain in 2019 examined genetic differences between left and right-handers. Analyzing data from approximately 400,000 individuals, scientists discovered that the left and right hemispheres of the brain were better connected in left-handers, particularly in regions associated with language. These traits suggest that left-handed individuals may have superior verbal skills.

Yes, anatomically, the brain structure differs in left and right-handers. A large study from the UK Biobank dataset found that left-handers had lower surface area asymmetry in the anterior insula, fusiform, anterior middle cingulate, and precentral cortices and reduced leftward thickness asymmetry along postcentral gyrus than adult right-handers.

This difference could pose several challenges for children if not adults. Left-handed children may face several learning challenges due to their unique brain structure and the predominantly right-handed design of educational tools and environments. Some common challenges include:

Left-handed children often find it difficult to write smoothly due to the way they need to position their hands. This can lead to smudging ink and difficulty seeing what they've written, potentially affecting their handwriting quality.

Many tools, such as scissors, are designed for right-handed use, making them difficult and sometimes uncomfortable for left-handed children to use effectively.

Activities that require spatial orientation, such as reading maps or certain types of puzzles, can be more challenging for left-handed children. This can sometimes be attributed to the way their brains process spatial information.

<strong>Social and Cultural Challenges</strong>

Left-handed children might feel different or singled out, especially if their left-handedness is seen as a curiosity or anomaly in their social circles. This can impact their self-esteem and confidence.

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I am a left-hander. Like most people in this category, my parents initially saw me as different and encouraged me to become right-handed. However, they soon accepted that this was simply who I was. Once the matter was settled, I began receiving comments about my intelligence and verbal skills, often being compared to the right-handed majority. But is there any truth to these claims, or are they just the perception of the majority?Left-handed people, also known as "lefties" or "southpaws," make up about 10% of the global population. Historically, left-handers were viewed as outcasts. During the Middle Ages, they were even accused of witchcraft and banished from society. As recently as the 20th century, many educators forced left-handed students to retrain their natural tendencies. Even the scientific community believed that left-handedness resulted from minor brain damage during early development.  All these myths have since been debunked, but what does neuroscience say? Researchers have found that while right-handed people may have slightly higher IQ scores on average, the difference is negligible. In the journal Neuroscience Biobehavioral Rev 2018, a systematic review and meta-analysis of 36 studies involving 66,108 individuals, examined whether handedness influences intelligence. The findings suggest that left-handers and right-handers generally have similar IQ scores. While some studies reported minor statistical differences favoring right-handers, the effect size was too small to be meaningful. Moreover, when the largest study was excluded, the significance disappeared. The analysis also found no IQ differences between right-handers and non-right-handers (including ambidextrous individuals) or between genders.Moreover, those whose left hand is dominant are better at taking verbal cues. A study published in Brain in 2019 examined genetic differences between left and right-handers. Analyzing data from approximately 400,000 individuals, scientists discovered that the left and right hemispheres of the brain were better connected in left-handers, particularly in regions associated with language. These traits suggest that left-handed individuals may have superior verbal skills.Does Brain Structure Differ?Yes, anatomically, the brain structure differs in left and right-handers. A large study from the UK Biobank dataset found that left-handers had lower surface area asymmetry in the anterior insula, fusiform, anterior middle cingulate, and precentral cortices and reduced leftward thickness asymmetry along postcentral gyrus than adult right-handers.This difference could pose several challenges for children if not adults. Left-handed children may face several learning challenges due to their unique brain structure and the predominantly right-handed design of educational tools and environments. Some common challenges include:Writing and HandwritingLeft-handed children often find it difficult to write smoothly due to the way they need to position their hands. This can lead to smudging ink and difficulty seeing what they've written, potentially affecting their handwriting quality.Scissors and ToolsMany tools, such as scissors, are designed for right-handed use, making them difficult and sometimes uncomfortable for left-handed children to use effectively.Spatial OrientationActivities that require spatial orientation, such as reading maps or certain types of puzzles, can be more challenging for left-handed children. This can sometimes be attributed to the way their brains process spatial information.Social and Cultural ChallengesLeft-handed children might feel different or singled out, especially if their left-handedness is seen as a curiosity or anomaly in their social circles. This can impact their self-esteem and confidence.

left-handers have a different brain structure-does it make them smarter than others?

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As per the American Society of Cataract and Refractive Surgery, June is the <span>cataract awareness month</span>. This has been designated as a month to spread awareness around cataract and educate the public about it. This is also the leading cause of <span>vision loss</span> worldwide. This month-long observance also highlights the importance of early detection and treatment of cataracts, and emphasizes that prompt intervention can significantly preserve vision. 

<h4>Why Is It Declared As The <span rel="noindex">Cataract Month</span>?</h4>

As per the International Agency for the Prevention of <span>Blindness</span> (IAPB), this has been done to provide patients and professionals with free educational resources on cataract, which is the clouding of eye's lens. According to the Centers for Disease Control and Prevention (CDC), cataract is the leading cause of blindness worldwide and the leading cause of vision loss in the United States. An estimated 20.5 million Americans aged 40 year and older have cataract in one or both eyes. 

It is the clouding of eye's natural lens, which sits just behind the iris. In a healthy eye, this lens focuses light onto the retina, allowing us to see clearly. Over time, due to aging or other factors, this lens may become cloudy, leading to blurred or dimmed vision. 

As per the World Health Organization (WHO), cataracts account for nearly 51% of world blindness and affects over 65 million people. 

<h4>History Of Cataract Awareness Month </h4>

Prevent Blindness declared the month of June as Cataract Awareness Month and it has been joined by other organizations, including the American Academy of Ophthalmology (AAO), and UNC Ophthalmology. This month spotlights an ocular disease. 

The earliest documented case of cataract was reported to be in a museum in Cairo that houses a small statue from the 5th dynasty. The wooden statue is of a priest reader who has a white patch carved into the pupil of the left eye. It is thought to represent a cataract. 

The earliest procedure of cataract removal is couching. Several illustrations too have been found inside Egyptian temples and tombs depict surgical instruments that indicate the use of couching, a procedure that involved dislodging the eye lens to clear the cataract. 

<h4>How Does Cataract Affect Vision?</h4>

<ul><li>Blurred or foggy vision</li><li>Increased sensitivity to light or glare</li><li>Difficulty seeing at night</li><li>Colors appear faded or yellow</li><li>Frequent changes in glasses prescription</li><li>Seeing halos around lights</li></ul>

Cataract are caused by various factors, some of which include diabetes, prolonged exposure to UV rays, smoking and alcohol consumption, long-term use of corticosteroids, and eye injuries. 

The best way to prevent them is to wear UV-protective sunglasses, manage systemic conditions like diabetes and also go for regular eye exams, especially after the age of 40. It is also important to focus on your diet and other lifestyle habits, and consume more green leafy vegetables, and fruits.

june cataract month

eye health

health and wellness

cataract awareness month

cataract month

vision loss

blindness

As per the American Society of Cataract and Refractive Surgery, June is the cataract awareness month. This has been designated as a month to spread awareness around cataract and educate the public about it. This is also the leading cause of vision loss worldwide. This month-long observance also highlights the importance of early detection and treatment of cataracts, and emphasizes that prompt intervention can significantly preserve vision. Why Is It Declared As The Cataract Month?As per the International Agency for the Prevention of Blindness (IAPB), this has been done to provide patients and professionals with free educational resources on cataract, which is the clouding of eye's lens. According to the Centers for Disease Control and Prevention (CDC), cataract is the leading cause of blindness worldwide and the leading cause of vision loss in the United States. An estimated 20.5 million Americans aged 40 year and older have cataract in one or both eyes. What Is Cataract?It is the clouding of eye's natural lens, which sits just behind the iris. In a healthy eye, this lens focuses light onto the retina, allowing us to see clearly. Over time, due to aging or other factors, this lens may become cloudy, leading to blurred or dimmed vision. As per the World Health Organization (WHO), cataracts account for nearly 51% of world blindness and affects over 65 million people. History Of Cataract Awareness Month Prevent Blindness declared the month of June as Cataract Awareness Month and it has been joined by other organizations, including the American Academy of Ophthalmology (AAO), and UNC Ophthalmology. This month spotlights an ocular disease. The earliest documented case of cataract was reported to be in a museum in Cairo that houses a small statue from the 5th dynasty. The wooden statue is of a priest reader who has a white patch carved into the pupil of the left eye. It is thought to represent a cataract. The earliest procedure of cataract removal is couching. Several illustrations too have been found inside Egyptian temples and tombs depict surgical instruments that indicate the use of couching, a procedure that involved dislodging the eye lens to clear the cataract. How Does Cataract Affect Vision?The following symptoms are:Blurred or foggy visionIncreased sensitivity to light or glareDifficulty seeing at nightColors appear faded or yellowFrequent changes in glasses prescriptionSeeing halos around lightsWhat Causes Cataract?Cataract are caused by various factors, some of which include diabetes, prolonged exposure to UV rays, smoking and alcohol consumption, long-term use of corticosteroids, and eye injuries. The best way to prevent them is to wear UV-protective sunglasses, manage systemic conditions like diabetes and also go for regular eye exams, especially after the age of 40. It is also important to focus on your diet and other lifestyle habits, and consume more green leafy vegetables, and fruits.

cataract awareness month: importance, significance, and history

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Is Regrowing Human Limbs A Possibility Now?

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Nature is filled with amazing flora and fauna, all with different sets of abilities and unique features. While considered impossible for humans, there are many animals that can <span>regenerate</span> part of their bodies. Sea creatures like starfish and octopuses can regenerate their limbs in case they get hurt or have to decapitate themselves to escape from a difficult situation. Living in the wild, these creatures evolved to adapt to the harsh nature of their surroundings. 

This is not the case for humans. Many people have to live without their limbs or organs, whether it is due to being born that way or being hurt/experiencing an accident. However, taking inspiration from one such animal, researchers are looking into human limb regeneration. 

Axolotls, with their unique smiles and frilly gills, have become very popular. But these friendly salamanders are more than just cute faces. Scientists are studying them because they might help us solve a big medical mystery: Can people someday grow back lost body parts, like an arm or a leg? 

<h2>Why Did Researchers Pick Axolotls? </h2>

In a groundbreaking <span>study</span> published on June 10 in Nature Communications, Monaghan's team utilized genetically engineered axolotls that glow in the dark to better understand this astonishing process. What makes axolotls so special? They have an incredible ability to regrow any part of their body, no matter how old they are. If they lose a leg, they can grow it right back. 

Even if their heart, lungs, or brain gets hurt, they can fix themselves! This amazing ability makes them champions among animals for their extreme healing powers. One of the long-standing questions in limb regrowth has been how cells "know" precisely which part of the limb to rebuild. For instance, if an axolotl loses its upper arm, it regenerates the entire arm. However, if the injury occurs further down the limb, only the lower arm and hand regrow. 

The key to this mystery appears to be a small molecule called retinoic acid, a compound related to vitamin A and commonly found in skincare products under the name retinol. This molecule acts like a GPS, providing cells with crucial positional information, guiding them on where they are on the body and what specific part needs to be rebuilt. 

<h2>How Retinoic Acid Directs Regrowth </h2>

The study's findings were compelling. When axolotls were given a drug that prevented the breakdown of retinoic acid, their limbs regenerated incorrectly, with an upper arm forming where a lower arm should have been. In contrast, axolotls not given the drug regrew their limbs normally. This strongly suggests that retinoic acid precisely instructs cells about their location and what structure to grow. 

While we are still a long way from growing human limbs, this study is a big step in that direction. The scientists believe this research could eventually help people. We all have the same basic genetic instructions for building limbs that we used when we were developing as babies. The challenge now is to figure out how to turn those same instructions back on later in life, which axolotls can do but humans can't yet. This is one of the oldest and most exciting questions in biology. Thanks to the growing interest in axolotls, especially among kids, these unique animals are helping to advance amazing scientific discoveries. It's quite surprising how popular axolotls have become, showing up everywhere from airports to toy stores. 

Regrowing Human Limbs

regenerate

regenerating human limbs

regeneration and nature

can human limbs regenerate

Study

Nature is filled with amazing flora and fauna, all with different sets of abilities and unique features. While considered impossible for humans, there are many animals that can regenerate part of their bodies. Sea creatures like starfish and octopuses can regenerate their limbs in case they get hurt or have to decapitate themselves to escape from a difficult situation. Living in the wild, these creatures evolved to adapt to the harsh nature of their surroundings. This is not the case for humans. Many people have to live without their limbs or organs, whether it is due to being born that way or being hurt/experiencing an accident. However, taking inspiration from one such animal, researchers are looking into human limb regeneration. Axolotls, with their unique smiles and frilly gills, have become very popular. But these friendly salamanders are more than just cute faces. Scientists are studying them because they might help us solve a big medical mystery: Can people someday grow back lost body parts, like an arm or a leg? Why Did Researchers Pick Axolotls? In a groundbreaking study published on June 10 in Nature Communications, Monaghan's team utilized genetically engineered axolotls that glow in the dark to better understand this astonishing process. What makes axolotls so special? They have an incredible ability to regrow any part of their body, no matter how old they are. If they lose a leg, they can grow it right back. Even if their heart, lungs, or brain gets hurt, they can fix themselves! This amazing ability makes them champions among animals for their extreme healing powers. One of the long-standing questions in limb regrowth has been how cells "know" precisely which part of the limb to rebuild. For instance, if an axolotl loses its upper arm, it regenerates the entire arm. However, if the injury occurs further down the limb, only the lower arm and hand regrow. Body's Internal GPS The key to this mystery appears to be a small molecule called retinoic acid, a compound related to vitamin A and commonly found in skincare products under the name retinol. This molecule acts like a GPS, providing cells with crucial positional information, guiding them on where they are on the body and what specific part needs to be rebuilt. How Retinoic Acid Directs Regrowth The study's findings were compelling. When axolotls were given a drug that prevented the breakdown of retinoic acid, their limbs regenerated incorrectly, with an upper arm forming where a lower arm should have been. In contrast, axolotls not given the drug regrew their limbs normally. This strongly suggests that retinoic acid precisely instructs cells about their location and what structure to grow. Hope for Human Healing While we are still a long way from growing human limbs, this study is a big step in that direction. The scientists believe this research could eventually help people. We all have the same basic genetic instructions for building limbs that we used when we were developing as babies. The challenge now is to figure out how to turn those same instructions back on later in life, which axolotls can do but humans can't yet. This is one of the oldest and most exciting questions in biology. Thanks to the growing interest in axolotls, especially among kids, these unique animals are helping to advance amazing scientific discoveries. It's quite surprising how popular axolotls have become, showing up everywhere from airports to toy stores. 

is regrowing human limbs a possibility now? sea salamanders study could be the medical future

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A red alert was issued for Wednesday, June 11, as extreme heatwaves hover over Delhi-NCR and states nearby. On Wednesday, the capital city's temperature shot up to 45.5 degrees, and marked the fifth consecutive time this month that the temperature crossed the 40-degree mark. The India Meteorological Department (IMD) issued a red alert for the national capital. 

As per the IMD's daily weather bulletin issued at 2 pm on Wednesday, "Heatwave conditions are likely to prevail at many places across Delhi-NCR."

<strong>ALSO READ: <a href="https://www.healthandme.com/nutrition/beat-the-heat-with-ors-how-to-know-which-one-is-real-article-151700706" data-type="tilCustomLink">Beat The Heat With ORS: How To Know Which One Is Real?</a></strong>

Dr Naresh Kumar, a senior scientist at IMD also told PTI that severe <span>heat wave</span> is expected across northwest India, including Delhi, Punjab, Haryana and Rajasthan. This is expected to persist until June 12. However, from June 13 onwards, one can expect wester disturbance to bring partial relief from the light rain and thunderstorms. This situation will replace the red alert with an orange alert. Dr Kumar also noted that Uttar Pradesh, Himachal Pradesh, Madhya Pradesh, and Jammu &amp; Kashmir will also remain under red alert for the next three days. 

The IMD data has predicted a slight dip in temperature after June 14. However, as of now, the IMD officials indicated that the temperature "feels like" 51.9. On Monday, the IMD noted that the temperature 'felt like' 49 degrees.

The heatwave not just shoots up the temperature, but also brings health issues, one can feel nauseated, dizziness, or even experience severe <span>dehydration</span>. However, there are some steps one could take to prevent this from happening.

<strong>READ MORE:<a href="https://www.healthandme.com/health-wellness/heatwave-in-india-know-how-it-affects-different-parts-of-your-body-article-151403887" data-type="tilCustomLink"> Heatwave In India: Know How It Affects Different Parts Of Your Body</a></strong> 

The combination of heat and low humidity causes tears to evaporate faster, leading to dry eye syndrome. Symptoms include redness, itching, burning sensations, and a gritty feeling, as though something is stuck in the eye. Blurred vision and eye fatigue may also occur.

More seriously, intense UV radiation from the sun can cause photokeratitis, or sunburn of the eye. This condition damages the cornea, resulting in pain, light sensitivity, and temporary vision loss. Over time, long-term UV exposure increases the risk of cataracts and macular degeneration, both of which can cause permanent vision problems.

Ironically, trying to escape the heat can also backfire. Spending too much time in air-conditioned environments dries out the air, which further reduces moisture in the eyes, intensifying the symptoms of dry eyes.

<h4>How It Impacts Rest Of Your Body</h4>

The body maintains a stable core temperature—around 37°C—through internal mechanisms controlled by the hypothalamus. Under normal conditions, sweating helps the body release heat, but in hot and humid weather, sweat doesn’t evaporate efficiently, reducing the cooling effect.

A 1985 NASA report noted that the body can only tolerate external temperatures above 35°C if humidity is low. When it fails to cool itself properly, the body begins to store excess heat—a condition known as hyperthermia.

This begins with heat exhaustion, marked by dizziness, weakness, thirst, and nausea. A 2023 study by the University of Roehampton in the UK found that at 40°C and 25% humidity, metabolic rates jumped by 35%—even though the core body temperature remained stable, the body was clearly under stress.

If untreated, heat exhaustion can progress to heatstroke, a potentially fatal condition where the body temperature exceeds 40°C. It puts enormous strain on the heart, kidneys, and brain, and requires immediate medical attention.

<strong>CHECK THIS OUT: <a href="https://www.healthandme.com/nutrition/foods-you-should-avoid-during-heat-wave-article-151389568" data-type="tilCustomLink">Foods You Should Avoid During Heat Wave</a></strong>

<h4>What To Do To Prevent This From Happening?</h4>

<ul><li>Wear UV-Protective Sunglasses</li><li>Stay hydrated</li><li>Use lubricating eye drops</li><li>Avoid direct sunlight </li><li>Limit air conditioner exposure immediately after you enter from outside</li><li>Avoid highly spiced or processed foods</li><li>Avoid caffeinated and alcoholic beverages</li></ul>

Delhi red alert

heat wave

seasonal health

health news

how to be safe in heat wave

heat wave safety warning

heat wave health impact

dehydration

A red alert was issued for Wednesday, June 11, as extreme heatwaves hover over Delhi-NCR and states nearby. On Wednesday, the capital city's temperature shot up to 45.5 degrees, and marked the fifth consecutive time this month that the temperature crossed the 40-degree mark. The India Meteorological Department (IMD) issued a red alert for the national capital. As per the IMD's daily weather bulletin issued at 2 pm on Wednesday, "Heatwave conditions are likely to prevail at many places across Delhi-NCR."ALSO READ: Beat The Heat With ORS: How To Know Which One Is Real?Dr Naresh Kumar, a senior scientist at IMD also told PTI that severe heat wave is expected across northwest India, including Delhi, Punjab, Haryana and Rajasthan. This is expected to persist until June 12. However, from June 13 onwards, one can expect wester disturbance to bring partial relief from the light rain and thunderstorms. This situation will replace the red alert with an orange alert. Dr Kumar also noted that Uttar Pradesh, Himachal Pradesh, Madhya Pradesh, and Jammu & Kashmir will also remain under red alert for the next three days. The IMD data has predicted a slight dip in temperature after June 14. However, as of now, the IMD officials indicated that the temperature "feels like" 51.9. On Monday, the IMD noted that the temperature 'felt like' 49 degrees.The heatwave not just shoots up the temperature, but also brings health issues, one can feel nauseated, dizziness, or even experience severe dehydration. However, there are some steps one could take to prevent this from happening.READ MORE: Heatwave In India: Know How It Affects Different Parts Of Your Body Heatwaves Impact On EyesThe combination of heat and low humidity causes tears to evaporate faster, leading to dry eye syndrome. Symptoms include redness, itching, burning sensations, and a gritty feeling, as though something is stuck in the eye. Blurred vision and eye fatigue may also occur.More seriously, intense UV radiation from the sun can cause photokeratitis, or sunburn of the eye. This condition damages the cornea, resulting in pain, light sensitivity, and temporary vision loss. Over time, long-term UV exposure increases the risk of cataracts and macular degeneration, both of which can cause permanent vision problems.Ironically, trying to escape the heat can also backfire. Spending too much time in air-conditioned environments dries out the air, which further reduces moisture in the eyes, intensifying the symptoms of dry eyes.How It Impacts Rest Of Your BodyThe body maintains a stable core temperature—around 37°C—through internal mechanisms controlled by the hypothalamus. Under normal conditions, sweating helps the body release heat, but in hot and humid weather, sweat doesn’t evaporate efficiently, reducing the cooling effect.A 1985 NASA report noted that the body can only tolerate external temperatures above 35°C if humidity is low. When it fails to cool itself properly, the body begins to store excess heat—a condition known as hyperthermia.This begins with heat exhaustion, marked by dizziness, weakness, thirst, and nausea. A 2023 study by the University of Roehampton in the UK found that at 40°C and 25% humidity, metabolic rates jumped by 35%—even though the core body temperature remained stable, the body was clearly under stress.If untreated, heat exhaustion can progress to heatstroke, a potentially fatal condition where the body temperature exceeds 40°C. It puts enormous strain on the heart, kidneys, and brain, and requires immediate medical attention.CHECK THIS OUT: Foods You Should Avoid During Heat WaveWhat To Do To Prevent This From Happening?Wear UV-Protective SunglassesStay hydratedUse lubricating eye dropsAvoid direct sunlight Limit air conditioner exposure immediately after you enter from outsideAvoid highly spiced or processed foodsAvoid caffeinated and alcoholic beverages

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Left-Handers Have A Different Brain Structure-Does It Make Them Smarter Than Others?

Quick Stories

At-Home HPV Testing Improves Cancer Screenings: Study

Cataract Awareness Month: Importance, Significance, and History

Is Regrowing Human Limbs A Possibility Now? Sea Salamanders Study Could Be The Medical Future

Health Conditions A-Z

At-Home HPV Testing Improves Cancer Screenings: Study

Cataract Awareness Month: Importance, Significance, and History

Is Regrowing Human Limbs A Possibility Now? Sea Salamanders Study Could Be The Medical Future