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Three-Chamber Sociability Calculator

Enter chamber times and interaction zone durations for sociability and social novelty trials. Get Sociability Index, Social Novelty Index, preference scores, and counterbalance validation.

Sociability IndexSocial NoveltyCSV Export
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Chamber times during habituation (empty apparatus)

  • Compute Sociability Index and Social Novelty Index from three-chamber test data
  • Compare sociability and social novelty preference across treatment or genotype groups with SEM error bars
  • Validate counterbalancing by checking habituation phase for side preference
  • Calculate discrimination ratios from both chamber time and interaction zone time
  • Export individual and group three-chamber data to CSV for downstream statistical analysis

Don't use for

  • Automated video tracking of social interactions — use ConductVision or dedicated tracking software
  • Resident-intruder, tube dominance, or other social behavior paradigms that require different scoring
  • Social conditioned place preference or social reward paradigms

What Is the Three-Chamber Social Approach Test?

The three-chamber social approach test, developed by Jacqueline Crawley and colleagues, is the most widely used behavioral assay for sociability and social novelty preference in rodents. The apparatus consists of three interconnected chambers with retractable doors between them. The test proceeds in three phases: (1) Habituation, where the animal freely explores the empty apparatus for 10 minutes; (2) Sociability trial, where a novel conspecific (Stranger 1) is placed under a wire cup in one side chamber while an identical empty wire cup is placed in the opposite side chamber; and (3) Social novelty trial, where a second novel conspecific (Stranger 2) is introduced under the previously empty cup while Stranger 1 remains. Each trial typically lasts 10 minutes. The test has become a gold standard for phenotyping social behavior in mouse models of autism spectrum disorder, schizophrenia, and other neuropsychiatric conditions because it dissociates sociability (preference for social vs. non-social stimulus) from social novelty preference (preference for novel vs. familiar social stimulus).

Sociability and Social Novelty Indices Explained

The Sociability Index (SI) and Social Novelty Index (SNI) are normalized difference scores that quantify the strength of social preference independently of total exploration. SI = (time_stranger - time_empty) / (time_stranger + time_empty) ranges from -1 (complete avoidance of the stranger) to +1 (exclusive preference for the stranger), with 0 indicating no preference. Similarly, SNI = (time_novel - time_familiar) / (time_novel + time_familiar) ranges from -1 to +1. These indices are analogous to the Discrimination Index used in novel object recognition and have the same advantage: they control for individual differences in overall activity levels. The complementary preference score (e.g., % time with stranger = T_stranger / (T_stranger + T_empty) x 100) provides the same information on a 0-100% scale where 50% is chance. Both metrics should be reported alongside total exploration time, because very low total exploration renders the indices unreliable.

Experimental Design and Counterbalancing

Rigorous three-chamber experiments require attention to several design elements. First, the side on which Stranger 1 is placed must be counterbalanced across animals within each group — half of the animals should have the stranger on the left and half on the right. Second, stimulus animals should be age- and sex-matched to the test animal and habituated to the wire cups before testing to minimize struggling or vocalizations that could introduce variability. Third, the apparatus must be thoroughly cleaned between subjects (70% ethanol followed by water, with adequate drying time) to remove olfactory cues. Fourth, testing should occur during the animals' active phase under consistent lighting conditions. Fifth, the experimenter should be blind to genotype or treatment group. For the social novelty phase, Stranger 2 should be from a different home cage than Stranger 1 to ensure true novelty. Record all sessions on video for verification and potential re-scoring. Define the interaction zone operationally (e.g., 2 cm radius around the wire cup) and apply the same definition consistently across all animals.

Frequently Asked Questions

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