Operational definitions are instrumental in determining the exact process by which research data should be collected and processed. Because operational definitions outline how data will be measured, ...

Objectives Various definitions for concussion have been proposed, each having its strengths and weaknesses. We reviewed and compared current definitions and identified criteria necessary for an ...

Scientists are working to develop an operational definition of "epigenetics" -- a rapidly growing research field that investigates heritable alterations in gene expression caused by mechanisms other ...