Last Updated on June 30, 2026
Social interaction is an important part of rodent behavior and can provide insight into the neural systems involved in social motivation, preference, recognition, and avoidance.
Researchers use social interaction tests to examine how genetics, neural circuits, environmental conditions, and experimental interventions may affect social behavior. These tests are also used in animal models relevant to neurodevelopmental and neuropsychiatric research.
Social interaction is not represented by a single measurement. Researchers generally evaluate several behaviors, including social approach, time near another subject, movement between test areas, and preference for a familiar or unfamiliar social stimulus.
Why researchers study social interaction in rodents
Changes in social approach, investigation, recognition, or avoidance can provide useful behavioral information. Researchers may use these measurements to study biological mechanisms, compare experimental groups, or evaluate the effects of an intervention.
Several testing paradigms are available, and each answers a different question. One of the most widely used is the three-chamber social interaction test, which separates the experimental subject from stimulus animals while allowing visual, auditory, and olfactory investigation.
What social interaction tests can measure
Sociability
Preference for spending time near a social stimulus rather than an empty enclosure or other non-social comparison.
Preference for social novelty
Preference for investigating a new social partner rather than a previously encountered social partner.
Social approach or avoidance
Whether the subject approaches, remains near, or moves away from a social stimulus.
Movement and investigation
Time spent investigating a stimulus, movement between chambers, chamber entries, and overall exploration of the apparatus.
Preference for a novel social stimulus may provide information about whether the subject distinguishes between familiar and unfamiliar animals. It should be interpreted alongside activity, investigation time, the experimental protocol, and appropriate control measurements.
Common social interaction paradigms
Three-chamber social approach test
The subject moves freely among three connected chambers while stimulus animals remain inside small enclosures. The test is commonly used to examine sociability and preference for social novelty.
Social novelty preference
The subject chooses between a previously encountered social stimulus and an unfamiliar social stimulus. This is frequently conducted as the final stage of a three-chamber protocol.
Direct social interaction assays
Two subjects interact within the same area. Researchers may observe approaching, sniffing, following, avoidance, and other reciprocal behaviors.
Other social behavior paradigms
Home-cage observation, group-housing assessments, social preference tests, and other specialized paradigms may be used when the study requires reciprocal interaction or observation in a familiar environment.
How the three-chamber social interaction test works
The exact procedure can vary, but a standard three-chamber test generally includes three stages.
Habituation
The subject explores the apparatus without social stimuli present. Habituation helps reduce the effect of a new environment and can reveal a strong pre-existing side preference.
Sociability
A social stimulus is placed in one side chamber, usually inside an enclosure. The other side contains an empty enclosure or other non-social comparison.
Social novelty
The previously encountered stimulus remains on one side while a new social stimulus is introduced on the other. The subject can investigate the familiar and unfamiliar social partners.
- Time spent in each chamber
- Time spent near each stimulus enclosure
- Direct investigation time, when recorded
- Entries into each chamber
- Total distance traveled or general movement
Planning a social interaction study?
Explore behavioral testing systems designed to support controlled experimental conditions and consistent data collection.
Experimental factors that can affect results
Social behavior can be influenced by biological, environmental, and procedural variables. These factors should be considered during study design and reported clearly.
- Animal strain, age, sex, and health
- Characteristics of the stimulus animal
- Housing and prior social experience
- Time of day and light–dark cycle
- Chamber-side counterbalancing
- Cleaning between trials
- Lighting and environmental consistency
- Handling and experimenter interaction
- Habituation duration and procedure
- Locomotor or sensory differences
Stimulus placement should be counterbalanced when possible, and the apparatus should be cleaned consistently between subjects. Housing, handling, habituation, and testing conditions should also remain consistent across experimental groups.
For a broader discussion of experimental consistency, read our guide to improving reproducibility in animal behavioral experiments .
Measuring and interpreting social behavior
No single measurement provides a complete description of social behavior. Researchers generally interpret several readouts together.
The amount of time spent in social, non-social, familiar, or novel stimulus areas.
Time spent within a defined investigation zone surrounding each enclosure.
Behaviors such as sniffing near the stimulus enclosure, when included in the scoring protocol.
The number of transitions into each chamber or defined test zone.
Total distance traveled, movement speed, or other indicators of general activity.
Calculated comparisons between time spent near two different stimuli.
Time spent in a chamber does not always mean the subject was actively investigating the social stimulus. Chamber time is most informative when considered with proximity, direct investigation, chamber entries, and general movement.
Video tracking and automated scoring can help researchers apply consistent zone definitions and reduce reliance on manual observation. Tracking quality should still be reviewed, and the selected measurements should reflect the intended behavioral question.
Choosing a behavioral testing setup
The appropriate setup depends on the behavior being studied, the required measurements, the animal model, and whether the protocol involves separated or direct interaction.
Apparatus considerations
- Chamber dimensions and configuration
- Visibility between chambers
- Stimulus enclosure design
- Ease of cleaning
Data collection considerations
- Video-tracking compatibility
- Consistent investigation zones
- Protocol flexibility
- Control of lighting and test conditions
Amuza provides O'Hara behavioral testing systems for a range of behavioral neuroscience applications. Researchers should select a system that fits the protocol rather than adapting the scientific question to the limitations of the equipment.
Need help selecting a behavioral testing setup?
Share your study goals, test paradigm, animal model, desired measurements, and data collection needs with our neuroscience team.
Reference: Crawley, J. N. (2007). What's Wrong With My Mouse? Behavioral Phenotyping of Transgenic and Knockout Mice. Hoboken, NJ: Wiley-Interscience.