Study Finds Association Between Respiration and Memory Consolidation in Humans

New research from Ludwig-Maximilians University has identified a clear association between respiration and memory consolidation during sleep. The team had previously determined that there was a direct relationship between the emergence of certain sleep-related brain activity patterns and the reactivation of memory contents during sleep, but it was unclear what controlled these rhythms so they went back and reanalyzed the data with colleagues.

In the study, published in Nature Communications, 20 participants viewed 120 images associated with specific words over two sessions. After sleeping for approximately two hours in a sleep laboratory, participants were questioned about the learned associations. Throughout the learning and sleep phases, EEG recorded brain activity and breathing. The researchers found that slow oscillations and sleep spindles, indicative of memory reactivation, occurred during sleep.

The precision of the coupling of these sleep-related brain rhythms was observed to increase from childhood to adolescence and decline during aging. Analyzing respiration frequency changes with age, the researchers established a link between breathing and the emergence of characteristic brain patterns. This connection highlighted the importance of respiration in memory processing during sleep, emphasizing its role beyond wakefulness.

Considering that older individuals often experience sleep disorders, respiratory issues, and declining memory function, the team plans to explore potential connections and investigate interventions, such as the use of CPAP masks for sleep apnea treatment.