structural:reformatting, information:classification, linguistic:voice_change, quality:corruption
Intellectual clarification?

D. W. Lucas, in an authoritative edition of the Poetics, comprehensively covers the various nuances inherent in the meaning of the term in an Appendix devoted to "Pity, Fear, and Katharsis". Lucas recognizes the possibility of catharsis bearing some aspect of the meaning of "purification, purgation, and 'intellectual clarification,'" although his approach to these terms differs in some ways from that of other influential scholars. In particular, Lucas's interpretation is based on "the Greek doctrine of Humours," which has not received wide subsequent acceptance. The conception of catharsis in terms of purgation and purification remains in wide use today, as it has for centuries. However, since the twentieth century, the interpretation of catharsis as "intellectual clarification" has gained recognition in describing the effect of catharsis on members of the audience.