Me too. I would also be interested in any studies of the presumably related term prasaṅkhyāna (= "sattvapuruṣānyatākhyāti" PYŚ) that is a keyword in the Pātañjalayogaśāstra. I am aware of
Endo, K. Mayeda, S.; Matsunami, Y.; Tokunaga,
M. & Marui, H. (Eds.) "Prasaṃkhyāna in
the Yogabhāṣya"in The Way to Liberation:
Indological Studies in Japan, Manohar Publishers & Distributors, 2000,
75-89.