Table 2.

Key words and definitions.

Key words	Definitions
‘Turn Constructional Unit’ (TCU)	A turn construct made of either sentential, clausal, lexical, or phrasal units (Sacks et al., 1974).
‘Transition Relevance Place’ (TRP)	A transition place after TCU, where the next speaker may take over a speaking turn (Sacks et al., 1974).
Exchange sequences	Sequences are made of two parts that are relevant to each other, where the first part produced by one speaker, selects the next speaker to contribute to the second part (Schegloff and Sacks, 1973). These may include, question-answer sequence (Schegloff, 1972), greeting-greeting sequence Schegloff, 1968, other-initiated repair sequences (Schegloff, 1997), or sequence-initiating actions (Robinson and Bolden, 2010).
Turn start	The speaker starts talking.
Turn give, turn yield, floor switch, end of the turn	The speaker has finished talking and is letting the next speaker take a turn.
Turn hold, floor hold	The speaker continues to talk after TRP.
Interruption, overlap	Simultaneous speech between conversation partners.
Backchannels, feedback responses, accompaniment signals	The listener uses short verbal and non-verbal responses during speech to acknowledge the speaker (i.e., nods, short segments of speech “mhm,” “yeah.”)
Breakdowns	The speaker has to repeat a segment of speech, because a conversation partner misunderstood, was unable to hear or did not focus attention on the speaker.
Hesitant speech	Speech that is difficult to construct, consisting of brief pauses that is likely to be accompanied with verbal or vocal hesitation markers, such as “mhm.”
Switching pause	A pause between turns.
Mutual gaze, eye contact	Two conversation partners looking at each other at the same time.
Gaze shift, gaze transition	A movement of eyes toward or away, from a person or object.
Gaze ratio	An amount of time spent gazing toward or away, from a person or object.