Exploring the (Placebo) Effect of an AI-Powered Dialogue System on Player Experience

This paper examines the impact of AI-generated versus human-written dialogue in a murder-mystery game on player experience. We manipulated both the game dialogue type (AI-generated vs. human-written dialogue) and the game type description (AI-labelled vs human-written-labelled) to assess effects on overall player experience (PX), immersion, and perceived autonomy. Results show that player expectations, modulated by the game type description, had a greater impact on overall PX than the actual game type. Players who thought that they played a game with a human-written narrative reported more positive overall PX, higher immersion and perceived autonomy regardless of which version they actually played. However, interacting with the AI-generated dialogue version led to higher perceived autonomy, suggesting that AI-driven dialogue can enhance perceived freedom without necessarily improving the overall PX. These findings show that player expectations, in response to game descriptions, play a central role in the experiences of players. This work contributes to understanding the influence of narratives and the extent to which AI features increase player engagement.