If the extrovert is trying to "cheer up" the introvert - extroverts are programmed to seek social rewards! - he or she may feel like a failure if the introvert remains unmoved.

Extroverts are more responsive to high-intensity and "happy" stimuli, which may be why an extrovert gets frustrated at the less "readable" face of the introvert.

Introverts are generally more sensitive to low-intensity stimuli - they are mentally alerted to inputs that extroverts may miss.

If you ask an introvert a question, wait until she thinks about it. Introverts think before speaking, not through speaking. If you want to get to the good stuff, you need to slow down.

Introvert, her brain responds with a high level of activity, it is as if several lights start flashing on a control panel.

Introverts like being introverts. We are drawn to ideas, we are passionate observers, and for us, solitude is rich and generative.

Asking others for input puts you in the driver's seat, and may feel less awkward than having to watch yourself on video.