Psychology, Neuroscience: Lacking in Individuality?

In research on people, scientists are typically interested in the group data - the mean, median, and variance of a sample of people. But according to a provocative new paper out in PNAS, the statistics of a group can obscure the variability within individuals, over time.The paper, from Aaron J. Fisher, John D. Medaglia, and Bertus F. Jeronimus, isn't really making a new point. The pitfalls of generalizing from the group to the individual level have long been known - but these issues