Induction of nitric oxide via humming does not improve short-term cognitive performance or influence emotional processing.
Level 2 - randomized trial
Controlled experimental laboratory study across four tasks (graded by design analogy)
PubMed 38573928 · doi:10.1371/journal.pone.0301268
What was done
Across four experiments, researchers tested whether paranasal nitric oxide released via humming improves human cognitive performance and emotional processing. Evaluated tasks included an articulatory suppression memory paradigm and a speeded detection task performed while humming, an emotional processing task viewing photos, and a speeded detection task where participants hummed before each trial.
What was found
The abstract provides no sample sizes, effect sizes, or numerical values. Humming concurrently with task performance exerted deleterious effects on both the articulatory suppression memory paradigm and the speeded detection task. Humming showed no effect on emotional processing of photos, and humming immediately prior to trials yielded no effect on response times.
Why it matters
The findings challenge the translation of animal models to humans regarding nasal nitric oxide and brain function, demonstrating that acute humming does not improve short-term memory, response speed, or emotional processing.
Limits
The abstract omits sample size, participant demographics, and statistical values. Direct physiological levels of nasal or cerebral nitric oxide were not measured, and concurrent humming introduces dual-task and articulatory suppression confounds.
Cited by
- context Preliminary studies show that sound vibration stimulates the production of nitric oxide in the body.