"studied concepts" is correct and usable in written English.
You could use it to refer to concepts that a student has learned about in a particular class, for example: "The student had a comprehensive understanding of the studied concepts in the history course."
In the intervening years, locus of control has become one of the most frequently studied concepts in psychology (Rotter 1990; Lefcourt 1992).
All three studied concepts were based on the idea of reducing the partial pressure of oxygen and other critical gases (Cl, S) within the Al-containing slurry near the substrate surface via a protective second layer.
Subjective well-being (SWB) as one of the most extensively studied concepts in positive psychology is defined as how a person evaluates his or her own life with respect to four separate aspects: life satisfaction, positive affect, the absence of negative affect, and domain satisfaction (Diener, Suh, Lucas, and Smith; 1999).
The simulated gene expression dataset exposes the CPBA model's close ties to the previously studied concepts of intramodular connectivity, module eigengenes, and eigengene adjacency.
or that climate change did not directly relate to their scientific discipline ("As a [microbiology] major, I studied concepts that are very small in scale.
Centrality is one of the most studied concepts in social network analysis to characterize social power and structural influence [3].
Now 11 years later, I see myself actually studying concepts of truth.
CP, MR: study concept & design.
SLM contributed to study concept and design.
JD contributed to study concept and design.
SY contributed to study concept, study design, and writing manuscript.
