Social valence dictates sex differences in identity recognition

Area of Science:

• Neuroscience
• Behavioral Science
• Psychiatry

Background:

• Maladaptive social information processing is linked to mood disorders, which disproportionately affect women.
• Social valence, the emotional significance of social experiences, plays a role in social cognition.

Purpose of the Study:

• To investigate sex differences in social valence processing in mice.
• To explore the neural mechanisms underlying these differences in the hippocampus.

Main Methods:

• Behavioral tasks assessing conspecific identity recognition under positive and negative valence conditions.
• In vivo calcium imaging of dorsal CA1 neuronal activity.
• Pharmacological enhancement of dorsal CA1 neuronal activity using ampakine.

Main Results:

• Male mice exhibited identity recognition irrespective of social valence.
• Female mice performed similarly to males in positive valence tasks but failed identity recognition in negative valence tasks.
• Female mice showed reduced hippocampal representation of social information under negative valence.
• Ampakine administration rescued identity recognition in female mice.

Conclusions:

• Significant sex differences exist in social valence processing, particularly under negative conditions.
• Reduced hippocampal representation of social information in females under negative valence may underlie impaired social recognition.
• These findings suggest a potential neurobiological basis for the higher vulnerability of women to social stress-related mood disorders.