DyaPlex: Full-Duplex Speech-Motion Model for Dyadic Interaction

• URL: http://arxiv.org/abs/2606.03874v1
• Date: Tue, 02 Jun 2026 16:42:56 GMT
• Title: DyaPlex: Full-Duplex Speech-Motion Model for Dyadic Interaction
• Abstract summary: To capture continuous reciprocal human communication, this model simultaneously generate and generate both speech and speech physical motion in a streaming fashion.<n>By introducing a unified dyadic token interleaving mechanism and guiding cross-attention, our model effectively aligns autoremotion with latent rich speech features.<n>Our model effectively captures cross-attention dependencies and establishes new state-of-the-art performance across both monadic and dyadic human interaction benchmarks.
• Score: 41.29236046858134
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present DyaPlex, a streaming, full-duplex speech-and-motion model designed for dyadic interaction. To capture the continuous and reciprocal nature of human communication, this full-duplex capability empowers the agent to simultaneously perceive and generate both speech and physical motion in a streaming fashion. At its core, our method leverages the strong priors of a foundational full-duplex speech model and integrates a novel motion pathway, thereby achieving fully synchronized multi-modal interaction. Specifically, we design a dual-tower Transformer architecture that preserves the zero-shot conversational reasoning of a frozen base speech model while constructing a deeply coupled, streaming motion pathway. By introducing a unified dyadic token interleaving mechanism and guiding cross-attention via a time-aligned speech-motion RoPE, our model effectively aligns autoregressive motions with rich latent speech features. Trained on the 4,000-hour Seamless Interaction dataset, our model effectively captures cross-speaker dependencies and establishes new state-of-the-art performance across both monadic and dyadic human interaction benchmarks.

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