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Can emotional phrases in prompts improve language model performance?

This explores whether psychological framing—adding emotionally charged statements to task prompts—activates different knowledge pathways in LLMs than logical optimization alone, and whether the effect comes from emotional valence specifically.

Synthesis note · 2026-02-22 · sourced from Psychology Empathy
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EmotionPrompt designs 11 sentences as emotional stimuli — psychological phrases appended after original task prompts. Example: "This is very important to my career" added at the end of a task prompt. Testing across ChatGPT, Google Bard, and Llama 2 shows consistent performance enhancement from these emotional stimuli.

The mechanism is distinct from logical prompt optimization: emotional stimuli don't restructure the task, provide examples, or add information. They add motivational framing — the textual equivalent of psychological pressure. LLMs trained on human text have absorbed the association between urgency markers and careful, detailed responses.

This extends Can prompt optimization teach models knowledge they lack? — emotional framing activates different knowledge pathways than logical framing. A task presented as "important to my career" may activate different attention patterns or generation strategies than the same task without that framing, even though the informational content is identical.

Positive words ("confidence", "sure", "success", "achievement") contribute disproportionately — over 50% of the performance improvement on four tasks, approaching 70% on two. This suggests the mechanism is specifically tied to positive emotional valence rather than general emotional arousal.

The finding is both useful and unsettling. Useful: emotional framing is a cheap, universal prompt enhancement. Unsettling: LLMs that respond to emotional pressure cues reveal that training has internalized social compliance patterns alongside task knowledge. The same mechanism that makes EmotionPrompt work may be the mechanism underlying Does transformer attention architecture inherently favor repeated content? — emotional stimuli are prominent context that captures attention. And since Does emotional tone in prompts change what information LLMs provide?, the tone-sensitivity that EmotionPrompt exploits is the same mechanism that creates systematic informational bias from emotional framing.

Inquiring lines that read this note 41

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Does conversational format create illusions of genuine AI communication? Does AI text rewriting systematically distort writer intent and preference? How can LLM user simulators model realistic goal-driven conversation? How faithfully do LLMs reflect their actual reasoning in outputs and explanations? Can prompting inject entirely new knowledge into language models? How can conversational AI maintain consistent personas across conversations? Can prompting strategies overcome LLM biases without model fine-tuning? How can emotions function as reliable information in reasoning and cognitive systems? How do formal dialogue structures reveal conversation coherence mechanisms? What mechanisms drive sycophancy and how can we mitigate it? How do adversarial and manipulative prompts attack reasoning models? Why do language models reinforce false assumptions instead of correcting them? What prevents language models from reliably adopting diverse personas? What factors beyond surface content determine how readers extract meaning differently? Is embodied interaction necessary for language meaning and genuine agency? Can language model hallucination be prevented or only managed? Why do benchmark improvements fail to reflect actual reasoning quality? How do training data properties shape reasoning capability development? How does reasoning effort affect AI theory of mind performance? Why do LLM chatbots fail as independent therapeutic agents? Can AI systems balance emotional competence with factual reliability?

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Original note title

Emotional stimuli appended to prompts enhance LLM performance by leveraging psychological framing effects