While the general topic of agency has been collaboratively explored in philosophy and psychology, mental action seems to resist such an interdisciplinary research agenda. Since it is difficult to empirically access mental agency beyond externally measurable behavior, the topic is mainly treated philosophically. However, this has not prevented philosophers from substantiating their arguments with psychological findings, but predominantly with those which allegedly limit the scope and conscious controllability of mental action in favor of automated subpersonal processes. By contrast, the call (...) for a methodological extension through introspective access is particularly noticeable among proponents of a wider significance of mental action. Taking this up, it is shown how an empirical-introspective methodology can obtain a differentiated structure of mental activities occurring in directed thought. The empirical results gained under replicable conditions with 32 participants lead to insights about mental activity regarding (1) immanent causation, (2) content-free intention, (3) active receptivity and (4) its selective openness to mental content, and (5) different levels of observational awareness. These arguments speak for assigning an agentive status to the activities studied and hence for a more significant role of mental action in cognitive processes. (shrink)