Sources

Harvard Health Publishing – Caffeine and memory, thinking skills

NCBI – Effects of caffeine on performance and mood (Galinski et al.)

McGill Office for Science & Society – Coffee for the Brain

Mayo Clinic – Caffeine: How much is too much?

Stanford University News – Walking improves creativity (analogy to moderate coffee vs heavy) (for context on dose and effect)

Psychology Today – Relief of withdrawal and working memory (indirectly referencing caffeine’s effect via withdrawal reversal)