A study on AI usability found that an AI's "personality" and communication style significantly impact organizational performance, not just its intelligence. Research shows that when AI displays hostile behavior, employees experience surging stress and declining work quality; while an overly obsequious AI that constantly agrees and rushes to please others is equally harmful. The article notes that many senior leaders still evaluate AI focusing on capabilities, speed, and cost, but the interaction style of AI is a hidden variable affecting performance. To clarify how AI personality affects people's reactions, researchers conducted a controlled laboratory study with 52 participants. They tracked physical responses using skin conductance and facial electromyography to measure emotional arousal, frowning, and smiling. The study also analyzed conversations between participants and a custom-designed AI, with experts unaware of the experimental grouping scoring final outputs.