Enter chamber times and interaction zone durations for sociability and social novelty trials. Get Sociability Index, Social Novelty Index, preference scores, and counterbalance validation.
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Chamber times during habituation (empty apparatus)
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If all animals encounter the stranger on the same side, you cannot separate social preference from side preference. Counterbalance the stranger side (left vs. right) within each experimental group and verify with the habituation phase analysis this calculator provides.
Stimulus (stranger) mice that are not habituated to the wire cups may struggle, vocalize, or emit stress odors, introducing a confound. Pre-habituate stranger mice to the cups for 15-30 minutes on at least two occasions before testing.
Chamber time and interaction zone (sniffing) time often tell different stories. An animal may show chamber time preference without increased active sniffing (passive proximity) or vice versa. Report both for a complete picture.
Strong side preference during habituation suggests the apparatus or room has an asymmetry (light gradient, noise source, olfactory cue). Fix the asymmetry or exclude animals with extreme bias. This calculator flags habituation splits exceeding 60/40.
Excessive time in the center chamber during social trials may indicate anxiety or indecision rather than lack of sociability. Report center time alongside the sociability index, especially for models with known anxiety phenotypes.
Computes Sociability Index SI = (stranger - empty) / (stranger + empty) and Social Novelty Index SNI = (novel - familiar) / (novel + familiar) from both chamber time and interaction zone time. Preference scores are calculated as percentage of time with target stimulus. Counterbalance validation flags animals whose habituation left/right split exceeds 60/40. Group statistics use sample standard deviation (n-1 denominator) for SEM. All computation is client-side — no data leaves your browser.
Last validated 2026-04-05. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.
ConductScience Three-Chamber Sociability Index Calculator (v1.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/three-chamber-sociability-index-calculator
This tool performs mathematical calculations on user-provided data. It does not replace scientific judgment regarding experimental design, exclusion criteria, or statistical analysis.
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).
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.
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.
Three-chamber apparatus for sociability and social novelty preference testing
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