According to a new book by psychologist Brian R. Little, entitled ME, MYSELF, AND US: The Science of Personality and the Art of Well-Being, introverts, like yours truly, are negatively impacted by the effects of caffeine:
After ingesting about two cups of coffee, extroverts carry out tasks more efficiently, whereas introverts perform less well. This deficit is magnified if the task they are engaging in is quantitative and if it is done under time pressure.
For an introvert, an innocent couple cups of coffee before a meeting may prove challenging, particularly if the purpose of the meeting is a rapid-fire discussion of budget projections, data analysis, or similar quantitative concerns. In the same meeting, an extroverted colleague is likely to benefit from a caffeine kick.
Personally, I do my best thinking work in the morning. I’m the type of person that needs lots and lots of data before making a decision. If I don’t have enough information to build connections that make sense to me, I’m most likely going to keep thinking and not answer. I gather lots of data and then the answer sort of magically appears. Coffee is part of my mornings. Coffee is part of my process. I need coffee to get to the answers, people!
I have to now think about if my brain is different than those in the study or if I could do a better job without coffee. And how much causation and correlation I want to apply.