Generative AI has greatly transformed creative work in various domains, such as screenwriting. To understand this transformation, prior research often focused on capturing a snapshot of human-AI co-creation practice at a specific moment, with less attention to how humans mobilize, regulate, and reflect to form the practice gradually. Motivated by Bandura's theory of human agency, we conducted a two-week study with 19 professional screenwriters to investigate how they embraced AI in their creation process. Our findings revealed that screenwriters not only mindfully planned, foresaw, and responded to AI usage, but, more importantly, through reflections on practice, they developed themselves and human-AI co-creation paradigms, such as cognition, strategies, and workflows. They also expressed various expectations for how future AI should better support their agency. Based on our findings, we conclude this paper with extensive discussion and actionable suggestions to screenwriters, tool developers, and researchers for sustainable human-AI co-creation.

翻译：生成式人工智能已极大地改变了包括编剧在内的多个领域的创造性工作。为理解这一变革，先前研究多聚焦于捕捉特定时刻人机协同创作实践的静态图景，而较少关注人类如何通过调动、调节与反思逐步形成此类实践。基于班杜拉的人类能动性理论，我们开展了一项为期两周的研究，邀请19位专业编剧参与，以探究他们如何在创作过程中接纳人工智能。研究发现，编剧们不仅能有意识地规划、预见并回应人工智能的使用，更重要的是，他们通过对实践的反思，在认知、策略与工作流等方面实现了自我发展与人机协同创作范式的演进。此外，他们也对未来人工智能应如何更好地支持其能动性表达了多元期许。基于研究发现，本文在结尾部分展开了广泛讨论，并为编剧、工具开发者和研究者提出了促进可持续人机协同创作的具体建议。