Mehta, Zhu, and Cheema (2012) published a landmark study in the Journal of Consumer Research examining the effects of ambient noise on creative cognition. Across five experiments, moderate ambient noise (approximately 70 dB, typical of a coffee shop) enhanced creative task performance compared to quiet conditions (50 dB). High noise (85 dB) impaired creativity.
The proposed mechanism: moderate noise increases processing difficulty, which induces higher construal level (more abstract thinking), which enhances creativity. The brain works slightly harder to maintain focus, and that extra effort paradoxically broadens the scope of associative thinking.
Awada et al. (2022), published in Scientific Reports, found that 45 dB white noise improved sustained attention, accuracy, speed, and creativity (65% vs 51% in ambient conditions) in neurotypical young adults.
This study used a general population, not ADHD participants. No study has tested cafe noise specifically with ADHD individuals. The speech babble component of cafe noise may interact differently with ADHD attention, as the irrelevant speech effect shows that intelligible speech is distracting while unintelligible babble (multiple overlapping conversations) is benign.