In 2018, astronaut Scott Kelly went into space for a year while his identical twin brother stayed on earth. The purpose was to study genetic changes that occur by spending time in space. Twin studies have been a staple of psychological research since the late 1800s. But many people don’t know about the underlying philosophy of twin studies, how they have been used, and what we can learn from them. Turns out this research method is a lot less robust than it seems. Learn about what the “shared experience” hypothesis is and how it weakens the execution of psychological research and testing using twins.
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