Many academic researchers would die for such a bunch of free and consistent subjects for longitudinal studies.

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He's heading the Symphony Project, one of the first longitudinal studies of its kind on the effects of musical training on brain development.

BBC: Magazine

The longitudinal studies that have been done have shown no difference in emotional and mental health between children raised by gay and lesbian parents and children raised by heterosexual parents.

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Only longitudinal studies that follow the economic lives of the same people over long periods of time have the power to reveal the true nature of income inequality, along with the various factors that cause some people to be more economically successful than others.

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