Ekagrata parinama (Yoga)

The tendency for distractions to arise, stilled in samadhi parinama, is followed by tendency for the lack of impressions in the mind to continue; the only object to arise in the mind is that which arose previously, the essential object of samadhi. This is constantly repeated so the impression is of a single unchanging object of attention.

The second of three mental transformations described by Patanjali.