by R. Rosenthal and L. Jacobsen (2007):
Experimenters told teachers that 20% of the children in a certain elementary school showed unusual potential for intellectual growth. The names of the 20% were drawn by random sample. Eight months later these unusual or "magic" children showed significant gains in IQ than did the remaining children, who had not been singled out for the teachers' attention. The changes in the teachers' behavior towards these allegedly "special" children led to changes in their intellectual performance. These children did better not because they were any more intelligent than their classmates but because they were expected to do better by their teachers.
I believe this study is a wonderful reminder for what we already intuitively know. When we vision our children achieving their potential and consistently expect greatness from them, they will be able to reach their highest levels.
Link for book on Amazon: http://www.amazon.com/Pygmalion-Classroom-Expectation-Intellectual-Development/dp/1904424066
Link for more information on Wikipedia: http://en.wikipedia.org/wiki/Pygmalion_effect