update: group learning, IQ, and performance

I added a chart to the post on group learning:

The blue bar represents the low performers, the red bar high performers. All have the same measured IQ (126), and at the beginning of the study all are performing well below the level their IQ would predict. The higher performers then recover, and their performance increases to a "126" level. The the low performers do not recover, and their performance remains suppressed.