Previous research identified a differential contribution of information

structure and the visibility of facial and contextual information

to the acoustic-prosodic expression of pitch accents.

However, it is unclear whether pitch accent shapes are affected

by these conditions as well. To investigate whether varying

context cues have a differentiated impact on pitch accent trajectories

produced in conversational interaction, we modified

the visibility conditions in a spontaneous dyadic interaction

task, i.e. a verbalized version of TicTacToe. Besides varying

visibility, the game task allows for measuring the impact of

information-structure on pitch accent trajectories, differentiating

important and unpredictable game moves. Using GAMMs

on four speaker groups (identified by a cluster analysis), we

could isolate varying strategies of prosodic adaptation to contextual

change. While few speaker groups showed a reaction to

the availability of visible context cues (facial prosody or executed

game moves), all groups differentiated the verbalization

of unpredictable and predictable game moves with a groupspecific

trajectory adaptation. The importance of game moves

resulted in differentiated adaptations in two out of four speaker

groups. The detected strategic trajectory adaptations were characterized

by different characteristics of boundary tones, adaptations

of the global f0-level, or the shape of the corresponding

pitch accent.