Honest note: the evidence is promising but mixed, and audio tools should be seen as supportive rather than guaranteed performance enhancers.
Söderlund et al. (2007)
Behavioral and Brain Functions
Found that background white noise improved cognitive performance in children with attention difficulties, supporting the broader idea that carefully designed noise can benefit focus in some users.
Söderlund et al. (2010)
Acta Paediatrica
Reported that noise benefited memory and attention performance in children with ADHD symptoms more than in control groups, suggesting stimulation can interact with attention systems differently across individuals.
Iaccarino et al. (2016)
Nature
Showed that gamma-frequency sensory stimulation affected neural activity patterns in animal models, helping inspire later interest in gamma-associated entrainment approaches.