People with disabilities that affect their speech may use speech-generating devices (SGD), commonly referred to as Augmentative and Alternative Communication (AAC) technology. This technology enables practical conversation; however, delivering expressive and timely comments remains challenging. This paper explores how to extend AAC technology to support a subset of humorous expressions: delivering timely humorous comments -- witty remarks -- through AI-powered interfaces. To understand the role of humor in AAC and the challenges and experiences of delivering humor with AAC, we conducted seven qualitative interviews with AAC users. Based on these insights and the lead author's firsthand experience as an AAC user, we designed four AI-powered interfaces to assist in delivering well-timed humorous comments during ongoing conversations. Our user study with five AAC users found that when timing is critical (e.g., delivering a humorous comment), AAC users are willing to trade agency for efficiency contrasting prior research where they hesitated to delegate decision-making to AI. We conclude by discussing the trade-off between agency and efficiency in AI-powered interfaces, how AI can shape user intentions, and offer design recommendations for AI-powered AAC interfaces.

翻译：患有影响言语功能的残障人士常使用语音生成设备（SGD），通常称为增强性与替代性沟通（AAC）技术。该技术虽能实现实用性对话，但如何传递富有表现力且适时的评论仍具挑战。本文探讨如何扩展AAC技术以支持一类幽默表达：通过AI驱动界面实现适时的幽默评论——即机智妙语。为理解幽默在AAC中的作用以及使用AAC传递幽默面临的挑战与体验，我们对七位AAC用户进行了质性访谈。基于这些洞见及第一作者作为AAC使用者的亲身经验，我们设计了四种AI驱动界面，用于在持续对话中辅助传递时机恰当的幽默评论。通过对五位AAC用户的实验研究发现，当时机至关重要时（例如发表幽默评论），AAC用户愿意以自主权换取效率——这与先前研究中他们不愿将决策权委托给AI的倾向形成对比。最后，我们讨论了AI驱动界面中自主权与效率的权衡、AI如何塑造用户意图，并为AI赋能的AAC界面提出了设计建议。