Sexually dimorphic behavioral and neural responses to a predator scent

Area of Science:

• Neuroscience
• Animal Behavior
• Olfactory Processing

Background:

• Predator odor detection is crucial for survival.
• Sex differences in behavioral responses to threat are observed across species.
• Neural mechanisms underlying sex-specific threat responses require further investigation.

Purpose of the Study:

• To investigate sex differences in behavioral and neural responses to predator odor in mice.
• To examine the role of specific brain regions in mediating these sex-specific responses.

Main Methods:

• Behavioral testing of male and female C57BL/6J mice on a predator odor response task.
• Immunohistochemical analysis of c-fos expression in mouse brains following odor exposure.
• Statistical analysis of behavioral data and c-fos expression levels.

Main Results:

• Both sexes explored more in the presence of methyl valerate (MV) compared to control bedding.
• Males showed increased exploration in the presence of phenylethylamine (PEA), similar to MV response.
• Females showed avoidance behavior in PEA, similar to controls, and exhibited increased c-fos expression in key brain regions, while males showed suppressed expression.

Conclusions:

• Males and females exhibit distinct behavioral strategies and neural activation patterns in response to predator threat.
• Sex-specific processing of predator cues may involve differential regulation of immediate early gene expression in brain regions like the anterior piriform cortex, cingulate cortex, and dorsomedial hypothalamus.