Which of the following is NOT one of Brentano's methodologies for studying the mind?

Brentano proposed specific methodologies for studying the mind, emphasizing the importance of direct experiences and observations of mental phenomena. Direct inner observation allows researchers to examine their own conscious experiences directly. Indirect inner observation contributes to understanding mental processes by inferring from behavior rather than directly observing consciousness itself. Objective observation, while mainly focusing on observable behavior, directly relates to Brentano's broader framework in studying the mind.

Self-reflective observation, while it might seem plausible in the context of introspection, does not align with Brentano’s methodologies. He distinguished between direct engagement with one’s mental states and forms of reflection that may not yield verifiable or standardized data. Thus, it is not classified as one of the methodologies he advocated for systematically studying the mind.