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Angry prosody slows responses to simple commands

Previous research has found that emotional prosody can interact with speech perception and listeners’ processing of the meaning of particular word/emotion pairings (Kim and Sumner, 2017). What remains unclear is how this interactive processing can affect behavioral responses such as responses to imperatives. To answer this question, 42 participants were presented with a series of commands read either with angry prosody, happy prosody, or neutral prosody and were instructed to press the requested button on a response box as quickly and accurately as possible. All emotional states were performed by a trained actor, rather than induced, and the stimuli were independently rated for accuracy of performance. On average, participants responded roughly 50ms slower to the commands which were performed with "angry" prosody. There was no difference between responses to "happy" and "neutral" prosody commands. This difference in response time may be due to the heightened neurological responses to angry stimuli (Frueholz and Didier, 2013). These results are consistent with a model of speech perception in which linguistic and social information are processed simultaneously and interactively (Sumner et al., 2014) but not with a model in which emotional aspects of the speech signal or discarded or irrelevant to perception.