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Article 1: Wagman, J. B., Zimmerman, C., & Sorric, C. (2007). “Which feels heavier—a pound of lead or a pound of feathers?” A potential perceptual basis of a cognitive riddle. Perception, 36, 1709–1711.
Summary: With reference to the size-weight illusion, the authors explored the perceptual aspects of the cognitive riddle that a pound of lead feels heavier than a pound of feathers by measuring the perceptual judgments of individuals holding boxes of each substance.

Article 2: Reder, L. M. et al. (2013). Why it’s easier to remember seeing a face we already know than one we don’t: Preexisting memory representations facilitate memory formation. Psychological Science, 24, 363–372.
Summary: The authors explore the memory advantage for associating faces with environmental context showing that known faces are more easily remembered with context reinstatement than unknown faces.

Article 3: Stafford, T., & Dewar, M. (2014). Tracing the trajectory of skill learning with a very large sample of online game players. Psychological Science, 25, 511–518.
Summary: This study analyzed data from a very large sample of players of an online game involving rapid perception, decision making, and motor responding. Use of game data allowed connection, for the first time, of rich details of training history with measures of performance from participants engaged for a sustained amount of time in effortful practice. It shows that lawful relations exist between practice amount and subsequent performance, and between practice spacing and subsequent performance.