Complex yoga poses on 17-28 all deal with the subject of detachment. Thus, the term linked with objects (samprajnata) in 1.17 does not refer to a type or types of concentration, as all traditional commentators have claimed, but to the lower detachment mentioned in 1.15: that relating to seen and revealed objects. This lower detachment has four characteristics: reasoning (vitarka); reflection (vicara); joy (ananda) and egoity (asmita). 1.18 can then be taken to refer to the higher detachment (para vairagya) mentioned in 1. Complex yoga poses 2016.
Complex yoga poses Yoga Poses 8.