What defines the limits of practice for psychologists in a receiving state?

The correct choice accurately indicates that the receiving state is responsible for defining the limits of practice for psychologists. In the context of psychology, when a professional practices in a state other than where they are licensed (the home state), the regulations and scope of practice established by that receiving state must be adhered to. This recognizes that each state has the authority to determine its own laws and requirements concerning professional practice, which may vary significantly from those in the psychologist's home state.

The receiving state's regulations help ensure that all practitioners meet the local standards and comply with specific ethical and legal guidelines, which can include aspects like licensure, permissible activities, and requirements for continuing education. Therefore, it is essential for psychologists who move or practice across state lines to familiarize themselves with the relevant laws of the state in which they are offering their services.

The other options do not accurately represent the regulatory framework for psychology practice across state lines. The home state does not have authority over practice limits in another state, national standards alone do not dictate local practice limits, and there is significant variability across states, making it incorrect to claim that all states have identical practice limits.