Examples of binary labels assigned to each utterance indicating the presence or absence of shared recurrence between speaker.

aOther backward Discursis metrics quantify the extent to which a given utterance shares content from previous utterances made by the conversation partner. Other backward short indicates sharing of content from the immediately preceding utterance; other backward medium indicates sharing of content that a conversation partner uttered within a range of 10 preceding turns; other backward long indicates sharing of content that a conversation partner uttered across all preceding utterances.bOther forward Discursis metrics quantify the extent to which content of a given turn is being shared forward by the conversation partner in subsequent turns. Other forward short indicates that the conversation partner is sharing content of a given utterance in the immediately following utterance; other forward medium indicates that content of a given turn is being shared in one or several subsequent turns by the conversation partner within a range of ten utterances; other forward long indicates forward sharing of any content occurring across all subsequent turns.c, d Binary labels (Yes or No) for each care staff (CS) utterance indicate whether CS is sharing terms previously used by the person with dementia (PWD) and whether PWD is sharing terms previously used by CS.Yes*—despite Discursis values indicating medium- and long-term sharing for these turns, these values can be ascribed to the presence of short-term engagement and were therefore not included as instances of medium- and long-term recurrence in the analysis.Abbreviations: CS—Care staff, PWD–Person with dementia, VblAck–Verbal acknowledgment (coded communication behaviour), ActListen–Active listening (coded communication behaviour), SelfDisc–Self disclosure (coded communication behaviour), Y–Yes, N—NoExamples of binary labels assigned to each utterance indicating the presence or absence of shared recurrence between speaker.