Signification of verbs in Prābhākara Mīmāṃsā

Prābhākaras oppose the Bhāṭṭa view that verbal endings (ākhyātas) express the objective bhāvanā and verbal roots are only used because endings cannot be employed by themselves. On the contrary, Prābhākaras maintain that these very verbal roots express the activity typical of any verb. Verbal endings express instead only the number of the subject implied by the verbal root. Is this activity (vyāpāra) the same as the Bhāṭṭa bhāvanā? At first sight not, in so far as according to the Prābhākaras verbal roots can express all kinds of vyāpāras, including instances such as "he sleeps". And, as far as I know, "he sleeps" does not express a bhāvanā, as it cannot be synonym of "he makes an effort" and so on. That is, vyāpāra seems broader than bhāvanā.