Investigator bias refers to the tendency of a researcher or investigator to unconsciously influence the outcome of a study or investigation due to their personal beliefs, preferences, or preconceived notions. This can occur in various forms, such as selecting certain data to support their hypothesis, interpreting results in a way that aligns with their expectations, or even unintentionally influencing participants’ behavior. Investigator bias can significantly impact the validity and reliability of research findings, and it is crucial for researchers to remain aware of their own biases and take steps to minimize their influence.