Reference Terms
from Wikipedia, the free encyclopedia
Left-handed
A person who is left-handed primarily uses his or her left hand, more so than the right hand; a left-hander will probably use the left hand for tasks such as personal care, cooking, and so on. Writing is not as precise an indicator of handedness as it might seem, because many left-handed people write with their right hand but use their left hand for other tasks. Approximately 8 to 15% of the adult population is left-handed. Studies indicate that left-handedness is more common in males than females. Left-handedness, in comparison to the general population, also appears to occur more frequently in identical twins, and several groups of neurologically disordered individuals (people suffering from epilepsy, Down's Syndrome, autism, mental retardation, dyslexia, etc.)There have been many famous left-handed people, and the associated right brain hemisphere that is said to be more active in left-handed people has been found in some circumstances to be associated with genius and is correlated with artistic and visual skill.
Related Stories
1
2
Mind & Brain News
May 11, 2026
May 11, 2026 An ancient Chinese exercise routine may be just as powerful as a daily brisk walk for lowering blood pressure — without equipment, gyms, or intense workouts. In a major clinical trial, adults with stage 1 hypertension who practiced baduanjin, a ...
May 11, 2026 A new study suggests AI chatbots may do more than spread misinformation — they can actively strengthen a user’s false beliefs. Because conversational AI often validates and builds on what users say, it can make distorted memories, conspiracy ...
May 10, 2026 Scientists have uncovered a hidden “stop-scratching” signal in the nervous system that tells your brain when enough scratching is enough. The discovery centers on a molecule called TRPV4, which acts like part of an internal braking system for ...
May 7, 2026 Eating eggs might do more than just start your day—it could help protect your brain. Researchers found that people 65 and older who eat eggs regularly have a significantly lower risk of developing Alzheimer’s disease, with daily or near-daily ...
May 4, 2026 A new study suggests travel could be a surprisingly powerful anti-aging tool. By viewing tourism through the lens of entropy, researchers found that positive travel experiences may help the body stay balanced and resilient. Activities like exploring ...
May 4, 2026 A new study suggests a surprisingly simple compound could help fight Alzheimer’s disease. Researchers found that arginine—an inexpensive amino acid already considered safe—can reduce the buildup of toxic amyloid proteins in the brain, a ...
May 4, 2026 Creatine might be famous in the gym, but its real story is far more interesting. Naturally produced in the body, it helps power cells by rapidly regenerating ATP—the fuel that keeps muscles, the brain, and even the heart running during intense ...
May 4, 2026 A new study suggests depression may soon be detectable through a simple blood test—by tracking how certain immune cells age. Researchers found that accelerated aging in monocytes, a type of white blood cell, is closely tied to the emotional and ...
May 4, 2026 GLP-1 drugs like semaglutide—best known for treating diabetes and driving weight loss under the brand names Ozempic and Wegovy—may also deliver a surprising mental health boost. In a massive study tracking nearly 100,000 people over more than a ...
May 4, 2026 Drugs designed to clear amyloid beta from the brain—once seen as a promising path to slowing Alzheimer’s—may not actually help patients in any meaningful way, according to a major review of over 20,000 participants. Even more concerning, they ...
May 3, 2026 Coffee doesn’t just energize—it actively reshapes the gut and mind. Researchers found that both caffeinated and decaf coffee altered gut bacteria in ways linked to better mood and lower stress. ...
May 2, 2026 Scientists have discovered a way to help the brain clean itself of harmful Alzheimer’s plaques by activating its own support cells. By increasing a protein called Sox9, researchers were able to boost the activity of astrocytes, star shaped cells ...
Latest Headlines
updated 12:56 pm ET
May 6, 2026 A new twin study suggests your genes may play a bigger role in your future success than your upbringing. Researchers found that IQ, which is largely genetically influenced, strongly predicts ...
May 3, 2026 A hidden force may be quietly shaping how you feel—and you’d never even know it. Infrasound, an ultra-low-frequency vibration below the range of human hearing, is everywhere from traffic to old ...
May 3, 2026 The brain’s memory center may begin life more like a crowded web than an empty canvas. Researchers discovered that early neural networks in the hippocampus are dense and seemingly random, then ...
May 3, 2026 A new analysis of the “Boltzmann brain” paradox suggests our memories and sense of reality could, in theory, be random illusions born from cosmic chaos. By uncovering circular reasoning in how ...
May 1, 2026 Scientists have uncovered a surprising link between simple body movement and brain health: every time you tighten your abdominal muscles—even ...
Apr. 30, 2026 Researchers have identified a new potential weapon against Alzheimer’s: blocking a protein called PTP1B. In mice, this approach boosted memory and helped brain immune cells clear harmful plaque ...
Apr. 30, 2026 For decades, psychologists have debated whether the human mind can be explained by one unified theory or must be broken into separate parts like memory and attention. A recent AI model called Centaur ...
Apr. 30, 2026 Scientists have finally cracked one of the biggest mysteries in the senses: how smell is organized. By mapping millions of neurons in mice, researchers discovered that smell receptors in the nose ...
Apr. 28, 2026 Scientists at MIT discovered that chaotic laser light can spontaneously form a highly focused beam instead of scattering—if the conditions are just right. This “pencil beam” enabled them to ...
Apr. 28, 2026 Dreams are more structured than they seem, shaped by both personal traits and real-world experiences. Researchers found that the brain doesn’t just replay daily life—it reshapes it into ...