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General points about practice effects Intelligence tests differ in how much they are subject to practice effects. Practice effects can also be distinguished: Time between taking the test: The shorter the timeframe the more likely you will see practice related improvement. General practice on similar tests and similar items versus practice on the same set ...


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I'm not sure if this is what you are looking for, but the big umbrella term in the literature for puzzles like the Tower of Hanoi is problem solving. A Google Scholar search for "tower of hanoi" and "problem solving" generates ~5000 hits. Another related puzzle is the Tower of London, and that Scholar search generates an additional ~5000.


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I found this twitter study of mood in the US (U.S. Mood Throughout the Day, as inferred from Twitter) and it clearly shows circadian variation of mood - happier in the morning and evening. I'm surprised to see such a dip towards lunch time though.


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If the researcher randomly samples individuals from the population of interest and randomly assigns them to different experimental treatments, then it is a true experiment. Quasi-experimental design occurs when there is no random assignment to treatments. In general, true experiments can make claims about causality. Since all subjects in the experiment are ...



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