July 2026
April 2026
- Apr 25, 2026ConceptsThe Testing Effect: Quizzing Yourself for Better RetentionWhy the study method that feels effective is not. Roediger and Karpicke's 2006 benchmark compared repeated study against repeated retrieval with equal time on the material, and the retrieval group performed far better on a delayed test one week on while rating their learning lower. Their 2008 follow-up in Science found the same pattern even though students predicted repeated study would serve them as well or better.
- Apr 8, 2026ConceptsSpaced Repetition: The Most Efficient Way to Learn AnythingHow spaced repetition works and what spacing the research supports. Cepeda and colleagues analyzed 254 studies in 2006 and found the optimal gap is approximately 10 to 20 percent of the desired retention interval, so remembering something for a year means first reviewing it weeks later, not days. Ebbinghaus measured the forgetting curve in 1885, and Wozniak's SM-2 algorithm turned the principle into software in 1987.
June 2025
February 2025
- Feb 4, 2025ConceptsUnderstanding Executive Function and Self-RegulationMiyake's factor analysis separated inhibition, updating and shifting while finding they share substantial common variance. Watts, Duncan and Quan's replication with over 900 children then shrank the famous delay-of-gratification link by more than half once family background was controlled, and noted that waiting less is partly rational where promises of later reward have been unreliable. Working memory training shows near transfer but little far transfer.
- Feb 3, 2025ConceptsExploring Embodied Cognition: Mind-Body Connection InsightsStrack, Martin and Stepper had participants hold a pen between the teeth, forcing smile muscles, or between the lips, preventing them, while rating Far Side cartoons. The forced-smile group found them significantly funnier, with nobody told why. Williams and Bargh later had people hold hot or iced coffee before rating a stranger: the warm cup produced warmer judgments. James had argued in 1884 we feel afraid because we run. The body is part of the mind, not its vehicle.
- Feb 2, 2025ConceptsDual Process Theory: Understanding Human Judgment SystemsShane Frederick's Cognitive Reflection Test, published in 2005, put the bat-and-ball problem to roughly 3,400 students at elite American universities including Harvard, MIT and Princeton: more than half answered 10 cents instead of 5. In Tversky and Kahneman's Linda problem, 85% of participants ranked a conjunction as more probable than one of its own parts. The article also covers the critiques, including Evans's own admission that System 2 is not clean either.
January 2025
- Jan 13, 2025ConceptsFlow State: The Psychology Behind Optimal ExperienceIn 1963 Mihaly Csikszentmihalyi asked chess players a question most researchers thought naive: what does it feel like to play? Bodies disappeared, time went sideways, the right move arrived without deliberation. Several said flowing. Climbers, surgeons, composers and factory workers later described the same experience in almost identical language. Flow comes from the relationship between challenge and skill: too much challenge is anxiety, too much skill is boredom.
- Jan 11, 2025ConceptsConstrual Level Theory: The Effects of DistanceAsked to describe the same errand a year out, they wrote about saving money and building security. Liberman and Trope's 1998 study showed distance shifts attention from feasibility to desirability, which explains a familiar failure: people commit to things for reasons that will not be their motivational state when the day arrives. The page is candid that the temporal findings are robust while the spatial and hypothetical ones are smaller and less consistent.
- Jan 6, 2025ConceptsInattentional Blindness: Missing What We Don't NoticeHow attention makes conspicuous things invisible. Simons and Chabris asked viewers to count passes between players in white shirts while a person in a full gorilla suit walked into frame, paused to beat their chest and left, visible for approximately nine seconds. About half missed it entirely. Published in Perception in 1999, the study used no editing tricks: the gorilla was simply there and attention was elsewhere.
December 2024
- Dec 26, 2024ConceptsEgo Depletion: Is Willpower a Limited Resource?Why willpower-as-fuel became psychology's central replication case. Hagger's 2010 meta-analysis of 83 studies reported a medium-to-large effect, and in 2016 Hagger himself led a preregistered replication across 23 laboratories and 2,141 participants that found no effect. The glucose version fared worse: the reported blood sugar drops of 1 to 2 milligrams per deciliter are far too small to affect a brain regulated between roughly 70 and 100.
- Dec 13, 2024ConceptsThe Zeigarnik Effect: Why Unfinished Tasks Haunt the MindBluma Zeigarnik's 1927 Berlin experiments gave 164 participants 18 to 22 short tasks and interrupted about half, finding a recall advantage for the interrupted ones of roughly 1.9 to 1. Masicampo and Baumeister showed in 2011 that merely making a specific plan to finish a goal removed its interference with other cognitive work, without the task being done. The effect is conditional: it depends on ego-involvement, decays within a day or so, and sometimes reverses.
May 2024
January 2024
- Jan 29, 2024ConceptsHow Memory Works: Encoding, Storage, and RecallNader, Schafe and LeDoux reactivated an established fear memory in rats and found it needed fresh protein synthesis to restabilize, so blocking that impaired it. Every retrieval becomes a chance to update the trace, which is now informing trauma treatment. The page also covers Ebbinghaus's savings effect, where relearning forgotten material goes faster, showing something persists after conscious recall fails.
- Jan 27, 2024ConceptsWhat Is Intelligence? A Scientific OverviewFlynn documented roughly three points a decade, gains far too fast to be genetic, which means the tests track skills that develop with schooling and environment. The page also tells the uncomfortable history, how a scale Binet built to find Paris schoolchildren who needed help became the basis for immigration restriction and sterilization policy, and notes the gains have reversed in some Scandinavian cohorts since the 1980s.
- Jan 22, 2024ConceptsExploring Creativity Science: Insights and TheoriesKeith Richards woke in a Florida hotel in 1965 to thirty seconds of a guitar riff he had no memory of playing, followed by forty-five minutes of his own snoring. He assumed it was half-remembered from another song and nearly discarded it. Creativity resists measurement because it is defined partly by divergence from existing standards, and whether a composer's and a comedian's creativity share any mechanism is still a live question.
- Jan 10, 2024ConceptsNeed for Cognition: Understanding Thought PreferencesCacioppo and Petty recast a 1955 idea as a stable trait in 1982, shifting it from a drive that ambiguity switches on to a standing preference for effortful thought. The payoff is predictive: high scorers move on argument quality while low scorers move on source credibility. The page keeps the open problems in view, including the substantial overlap with openness to experience and a factor structure that did not fully replicate in a Taiwanese sample.
December 2023
December 2022
June 2022
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