evidence: Deliberate misinformation often uses common knowledge to tell an allegedly fact-based story. Some social media accounts connected heavier breathing while wearing FFR with the false claim to reduce blood oxygen saturation. Indeed, respiration behavior (amongst others, frequency and intensity, see37 for a review) changes while wearing an FFR (especially during exercise), and the physical dead volume of the respiratory system causes breathing to be more strenuous38. However, there is no evidence that wearing face masks (cloth/surgical masks or FFR) causes the blood oxygen levels to diminish22,23,24,26,27,29. Nevertheless, the literature lacks investigations tailored to quantify the impact of face masks, especially high filtering N95 FFR, on cognitive performance. We contribute to this research to refute misinformation and face worries regarding a connection between cognitive functioning and wearing N95 FFR.