Monday, September 14, 2015
MATHS Before 1000 BC
- ca. 70,000 BC — South Africa, ochre rocks adorned with scratched geometric patterns.
- ca. 35,000 BC to 20,000 BC — Africa and France, earliest known prehistoric attempts to quantify time.
- c. 20,000 BC — Nile Valley, Ishango Bone: possibly the earliest reference to prime numbers and Egyptian multiplication.
- c. 3400 BC — Mesopotamia, the Sumerians invent the first numeral system, and a system of weights and measures.
- c. 3100 BC — Egypt, earliest known decimal system allows indefinite counting by way of introducing new symbols.
- c. 2800 BC — Indus Valley Civilization on the Indian subcontinent, earliest use of decimal ratios in a uniform system of ancient weights and measures, the smallest unit of measurement used is 1.704 millimetres and the smallest unit of mass used is 28 grams.
- 2700 BC — Egypt, precision surveying.
- 2400 BC — Egypt, precise astronomical calendar, used even in the Middle Ages for its mathematical regularity.
- c. 2000 BC — Mesopotamia, the Babylonians use a base-60 positional numeral system, and compute the first known approximate value of π at 3.125.
- c. 2000 BC — Scotland, Carved Stone Balls exhibit a variety of symmetries including all of the symmetries of Platonic solids.
- 1800 BC — Egypt, Moscow Mathematical Papyrus, findings volume of a frustum.
- c. 1800 BC — Berlin Papyrus 6619 (Egypt, 19th dynasty) contains a quadratic equation and its solution.
- 1650 BC — Rhind Mathematical Papyrus, copy of a lost scroll from around 1850 BC, the scribe Ahmes presents one of the first known approximate values of π at 3.16, the first attempt at squaring the circle, earliest known use of a sort of cotangent, and knowledge of solving first order linear equations.
- 1046 BC to 256 BC — China, Chou Pei Suan Ching, arithmetic and geometric algorithms and proofs.
Posted by SATISH .S at 7:35 PM
Saturday, September 12, 2015
This study showed, by using fMRI, that after tutoring, the fear circuits and amygdala were no longer activated in children who had begun the study with high math anxiety. This provided confirmation that tutoring ameliorated the anxiety itself, rather than providing the kids with a coping mechanism that relies on other brain circuits.
Anxiety about doing math problems can be relieved with a one-on-one math tutoring program, according to a new study from the Stanford University School of Medicine. The tutoring fixed abnormal responses in the brain's fear circuits.The study, which will be published Sept. 9 in The Journal of Neuroscience, is the first to document an effective treatment for math anxiety in children.
"The most exciting aspect of our findings is that cognitive tutoring not only improves performance, but is also anxiety-reducing," said the study's senior author, Vinod Menon, PhD, professor of psychiatry and behavioral sciences. "It was surprising that we could, in fact, get remediation of math anxiety."
Even if they are good at math, many children feel anxious about doing math problems. For some, the anxiety persists throughout life, discouraging them from pursuing advanced math and science classes as well as careers that rely on mathematical expertise. Yet almost no attention has been paid to how to help alleviate this problem.
"Math anxiety has been under the radar," said the study's lead author, research associate Kaustubh Supekar, PhD. "People think it will just go away, but for many children and adults, it doesn't."
Measuring math anxiety
The new research was based on the idea that the principles of exposure-based therapy for treating phobias might also apply to alleviation of math anxiety. Phobias, such as the fear of spiders, can be relieved in affected individuals by repeatedly exposing them in a safe environment to the thing they fear.
The new study included 46 children in third grade. Before receiving tutoring, each child took a test that assessed his or her level of math anxiety. The children were divided into two groups -- one with high math anxiety, the other with low math anxiety -- based on whether their math anxiety scores fell above or below the median score for all of the children. They also completed standard neuropsychological assessments and were tested on simple addition problems while having their brains scanned via functional magnetic resonance imaging. The brain scans of the children with high levels of math anxiety showed activation in the brain's fear circuits and so-called "fear center," or amygdala, before tutoring, replicating a finding that Menon and colleagues published in 2012.
After the first fMRI scan, children participated in an intensive, eight-week tutoring program consisting of 22 lessons involving addition and subtraction problems. Tutors gave the lessons to each child individually. After tutoring, the math anxiety test and fMRI scans were repeated.
All of the children performed better on addition and subtraction problems after tutoring. The children who started the study with high levels of math anxiety had reduced anxiety after tutoring, while those in the low-math-anxiety group had no change in their anxiety levels.
After tutoring, the fear circuits and amygdala were no longer activated in children who had begun the study with high math anxiety, confirming that tutoring ameliorated the anxiety itself, rather than providing the kids with a coping mechanism that relies on other brain circuits.
"It's reassuring that we could actually help these children reduce anxiety by mere exposure to problems," Supekar said.
The researchers plan to conduct future studies to figure out what aspects of the one-on-one tutoring were helpful. Menon wants to test whether the interaction between tutors and students in a social context plays a role, or whether computerized tutoring can result in the same benefits and brain circuit changes.
"The tutoring has a standard protocol, but is also personalized," said Menon, who holds the Rachael L. and Walter F. Nichols, MD, Professorship. "If a child is stuck at a particular concept, the tutor tries to get the child beyond the bottleneck in a non-negative, encouraging way." Because the tutoring happens one-on-one, children do not have the opportunity to feel fearful about not performing as well as their peers, which may also help. "We need more research to understand that," Menon added.
The researchers also want to investigate whether the anxiety-reducing effects of tutoring will persist as children move on to learning more complex problem-solving skills.
Posted by SATISH .S at 9:59 PM