This paper characterizes the notion of embodied communicative feedback and relates it to coactivation of shared information (common ground) and coconstruction of new information in dialog. The account is based on the framework of Activity based Communication Analysis (ACA), cf. Allwood (2000). The talk touches on the following topics (i) Types of embodied feedback, both means of expression and basic functions (ii) The relationship of communicative feedback to levels of awareness and intentionality in communication (iii) The relation of feedback to the different basic semiotic sign types (iv) The relationship of feedback to communicative acts and their functions (v) The relationship of feedback to cooperation, ethics and trust Further, I will explore some empirical features of communicative feedback. (i) What are the most frequent types of verbal vocal feedback? (ii) How do utterances whose main function is to give feedback relate to other common short utterances in terms of frequency and function? (iii) What types of reduplications do we find with vocal feedback words?