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The development of olfactory preferences for artificial odors briefly experienced by the precocial spiny mouse young
1Sub-Department of Animal Behaviour, Cambridge University, Madingley, United Kingdom.
Insights
Young spiny mouse pups develop olfactory preferences through simple odor exposure, not associative learning. This familiarity effect is evident in pups up to 16 days old, but not in 18-day-old pups.
Area of Science:
- Neuroscience
- Developmental Biology
- Animal Behavior
Background:
- Olfactory perception plays a crucial role in early development for many species.
- Understanding the mechanisms of olfactory preference formation is key to comprehending sensory development.
Purpose of the Study:
- To investigate the developmental trajectory of olfactory preference in young spiny mouse pups (Acomys cahirinus).
- To determine whether olfactory preferences are acquired through simple stimulus familiarity or associative learning.
Main Methods:
- Pups aged 2–18 days were exposed to novel odors (cinnamon or cumin) for 1.5 hours.
- Preference tests were conducted 48 hours post-exposure.
- Control groups of naive pups were used to assess baseline odor neutrality.
Main Results:
- Pups aged 2–16 days showed a significant preference for the familiar odor.
- Pups aged 18 days did not exhibit a significant preference for the exposed odor.
- The tested odors were neutral for naive pups, indicating no inherent valence.
Conclusions:
- Olfactory preference in young spiny mice is primarily driven by stimulus familiarity.
- The capacity for developing odor preferences based on familiarity changes with age, diminishing by Day 18.
- Findings suggest a critical developmental window for olfactory learning in this species.
Abstract:
Groups of pups, aged 2, 4, 6, 12, 16, and 18 days of the precocial murid rodent spiny mouse (Acomys cahirinus), were each exposed for 1.5 h to one of the experimental odors, cinnamon or cumin, present in the surrounding environment. The odors were not contingent upon home-cage odors or any other reinforcers. This simple exposure produced a strong preference for the exposed odor in multichoice preference tests carried out 48 h after the exposure in pups from groups aged 2 through 16 days. Older pups exposed to cinnamon or cumin at Day 18 did not show a significant preference for the familiar odor. Both experimental odors used were found to be neutral for control experimentally naive pups within a tested age span. These results point at a stimulus familiarity, rather than associative learning in the development of olfactory preferences in young spiny mouse pups.