Archive for ‘Science’

August 8, 2019

Autorhythmicity

automaticity

Autorhythmicity [aw-toh-rith-miss-uh-tee], or automaticity, refers to the heart’s ability to spontaneously generate an electric charge without outside help. Cardiac electrical activity originates in the sinoatrial node (SAN) and is propagated via the ‘His-Purkinje’ network, the fastest conduction pathway within the heart. This pathway is known as the electrical conduction system of the heart.

The electrical signal travels from the SAN, which stimulates the atria to contract, to the atrioventricular node (AVN), which slows down conduction of the action potential from the atria to the ventricles. This delay allows the ventricles to fully fill with blood before contraction. The signal then passes down through a bundle of fibers called the ‘bundle of His,’ located between the ventricles, and then to the ‘purkinje’ fibers at the bottom (apex) of the heart, causing ventricular contraction.

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May 7, 2019

Cognitive Bias

cognitive bias is when someone makes a bad choice that they think is a good choice. This bias is an important part of the study of cognitive psychology, which looks at basic actions of the mind, such as thought, feeling, problem solving, memory, and language.

Cognitive biases are often a side effect of evolutionary changes. Some behaviors that were beneficial for primitive humans and animals are unsuited to modernity. Others are adaptive and may lead to more effective actions in a given context.

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October 29, 2018

Black Knight Satellite Conspiracy Theory

Space debris

The Black Knight satellite conspiracy theory claims that there is a spacecraft in near-polar orbit of the Earth that is of extraterrestrial origin, and that NASA is engaged in a cover-up regarding its existence and origin. This conspiracy theory combines several unrelated stories into one narrative.

A 1998 NASA photo is believed by some to show the Black Knight satellite, but NASA has stated that this is likely space debris, specifically a thermal blanket lost during an EVA mission.

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October 18, 2018

Waffle House Index

Waffle House

The Waffle House Index is an informal metric used by the Federal Emergency Management Agency (FEMA) to determine the effect of a storm and the likely scale of assistance required for disaster recovery. The measure is based on the reputation of the restaurant chain Waffle House for staying open during extreme weather and for reopening quickly, albeit sometimes with a limited menu, after very severe weather events such as tornadoes or hurricanes.

The term was coined by FEMA Administrator Craig Fugate in 2011, following the Joplin tornado, during which the two Waffle House restaurants in Joplin, Missouri, remained open.

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September 23, 2018

Belief Perseverance

Belief perseverance (also known as ‘conceptual conservatism’) is maintaining a belief despite new information that firmly contradicts it. Such beliefs may even be strengthened when others attempt to present evidence debunking them, a phenomenon known as the ‘backfire effect.’ For example, journalist Cari Romm, in a 2014 article in ‘The Atlantic,’ describes a study in which people concerned about the side effects of flu shots became less willing to receive them after being told that the vaccination was entirely safe.

Since rationality involves conceptual flexibility, belief perseverance is consistent with the view that human beings act at times in an irrational manner. Philosopher F.C.S. Schiller holds that belief perseverance ‘deserves to rank among the fundamental ‘laws’ of nature.’

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September 18, 2018

Pollyanna Principle

14,000 Things to be Happy About

The Pollyanna principle (also called ‘Pollyannaism’ or ‘positivity bias’) is the tendency for people to remember pleasant items more accurately than unpleasant ones. At the subconscious level, the mind typically focuses on the optimistic. At the conscious level, it tends towards the negative.

This subconscious bias towards the positive is often described as the Pollyanna principle and is similar to the ‘Forer’ or ‘Barnum’ effect, a tendency for individuals to give high accuracy ratings to descriptions of their personality that supposedly are tailored specifically to them, that are in fact vague and general enough to apply to a wide range of people (an impulse that fortune tellers and personality tests take advantage of).

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September 7, 2018

Leucism

Moby-Dick

Leucism [loo-kizm] is a condition in which there is partial loss of pigmentation in an animal resulting in white, pale, or patchy coloration of the skin, hair, feathers, scales or cuticle, but not the eyes. Unlike albinism, it is caused by a reduction in multiple types of pigment, not just melanin.

More common than a complete absence of pigment cells is localized or incomplete hypopigmentation, resulting in irregular patches of white on an animal that otherwise has normal coloring and patterning. This partial leucism is known as a ‘pied’ or ‘piebald’ effect; and the ratio of white to normal-colored skin can vary considerably not only between generations, but between different offspring from the same parents, and even between members of the same litter. This is notable in horses, cows, cats, dogs, the urban crow, and the ball python but is also found in many other species.

April 19, 2018

Falsifiability

The Logic of Scientific Discovery

A statement, hypothesis, or theory has falsifiability or refutability if there is the possibility of showing it to be false. It is falsifiable if it is possible to conceive an empirical observation which could refute it. For example, the universal generalization that All swans are white is falsifiable since it is logically possible to falsify it by observing a single swan that is not white.

The concern with falsifiability gained attention by way of philosopher of science Karl Popper’s scientific epistemology referred to as ‘falsificationism.’ Popper stresses the problem of ‘demarcation’—distinguishing the scientific from the unscientific—and makes falsifiability the demarcation criterion, such that what is unfalsifiable is classified as unscientific, and the practice of declaring an unfalsifiable theory to be scientifically true is pseudoscience.

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April 6, 2018

Chernoff Face

Chernoff

Chernoff faces, invented by American statistician Herman Chernoff in 1973, display multivariate data in the shape of a human face. The individual parts, such as eyes, ears, mouth and nose represent values of the variables by their shape, size, placement and orientation.

The idea behind using faces is that humans easily recognize faces and notice small changes without difficulty. Chernoff faces handle each variable differently. Because the features of the faces vary in perceived importance, the way in which variables are mapped to the features should be carefully chosen (e.g. eye size and eyebrow-slant have been found to carry significant weight). 

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March 12, 2018

Precognition

Princeton Engineering Anomalies Research Lab

Precognition (Latin: ‘acquiring knowledge’), also called ‘prescience,’ ‘future vision,’ or ‘future sight’ is an alleged psychic ability to see events in the future.

As with other forms of extrasensory perception (ESP), there is no reliable scientific evidence that precognition is a real ability possessed by anyone and it is widely considered to be pseudoscience. Specifically, precognition appears to violate the principle that an effect cannot occur before its cause.

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November 30, 2017

Dick Proenneke

Dick Proenneke [pren-uh-kee] (1916 – 2003) was a self-educated naturalist who lived alone for nearly thirty years in the mountains of Alaska in a log cabin he had constructed by hand near the shore of Twin Lakes.

Proenneke hunted, fished, raised and gathered his own food, and also had supplies flown in occasionally. He documented his activities in journals and on film, and also recorded valuable meteorological and natural data. The journals and film were later used by others to write books and produce documentaries about his time in the wilderness.

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August 3, 2017

Nominative Determinism

Implicit egotism

Nominative [nom-uh-nuh-tivdeterminism [dih-tur-muh-niz-uhm] is the hypothesis that people tend to gravitate towards areas of work that fit their names. The term was first used in the magazine ‘New Scientist’ in 1994, after its humorous ‘Feedback’ column noted several studies carried out by researchers with remarkably fitting surnames.

These included a book on polar explorations by Daniel Snowman and an article on urology by researchers named Splatt and Weedon. These and other examples led to light-hearted speculation that some sort of psychological effect was at work.

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