• Compare the interface usability of ChatGPT, DeepSeek, and Google Gemini using standardized usability metrics

• Measure and analyze emotional responses—specifically arousal, valence, and engagement—elicited during user interactions with each AI tool

• Examine the correlation between perceived usability scores and physiological/emotional engagement data collected via EEG

• EEG data (Emotiv Insight) for emotional response

• Post-task usability questionnaires (UEQ+)

• Metrics Captured: Arousal, Valence, Engagement, Fixation time, Saccade rate, Usability score

• AI Tools: ChatGPT, DeepSeek, Google Gemini

• BCI Device: Emotiv Insight headset

• Usability Instruments: UEQ+

• Insights into how interface design influences cognitive and emotional response

• Data-driven design recommendations for emotionally intelligent AI interfaces