Zilcha-Mano (2021) suggests that making a distinction between trait-like and state-like (TLSL) processes is the key to developing personalized treatments. In the current commentary, I question the novelty of the TLSL concept and emphasize the importance of having clearly defined, psychometrically sound concepts applied to psychotherapy research for it to advance. I raise questions regarding application of TLSL to psychotherapy on conceptual and methodological grounds, with an emphasis that answers to these questions are needed to advance the TLSL distinction.
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- personalized medicine
- process research
- psychotherapy research