New research from Northwestern University has discovered that mice can take a single, deliberate sniff to probe their environment—a behavior scientists previously believed was unique to humans. The finding upends decades of assumptions about how mammals process smells.
For years, the scientific community characterized rodent olfaction as rapid-fire sniffing, distinct from the slower, more intentional single inhales humans use to assess a scent. The study reveals that the underlying neural system for this deliberate probing is preserved across mammalian evolution.
Researchers observed that mice, like humans, can take a single deep inhale to gauge something—such as whether a piece of food is suitable. This contrasts with the rapid, staccato sniffs typically associated with rodent foraging behavior.
The discovery suggests that the ability to take a single, investigative sniff is an evolutionarily ancient trait shared across mammals. It opens new avenues for understanding how olfactory systems function and could have implications for research into sensory processing disorders.
The findings challenge the traditional view that specialized sniffing patterns are a distinguishing feature between species. Further research is needed to determine whether other mammals also possess this capacity.