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Resident Intruder
SKU CS-958220-04-CLEAR
$2,290.00
Unit: Each
IncludesStandard Care
Standardized behavioral paradigm for assessing aggression, territorial behavior, and social stress responses through controlled resident-intruder interactions.
CE MarkedBAA available
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Louise Corscadden, PhD
Director of Science · ConductScience
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Key Specifications
Full details →- Model fit
- Mouse, Rat
- SKU family
- CS-958220
- Shipping box
- 65.0 × 36.0 × 27.0 cm
- Ordering
- Online checkout and quote request available
- Category
- Behavioral Mazes
- Build notes
- Confirm accessories, station layout, and support needs before purchase
The Resident Intruder test is a standardized behavioral paradigm used to assess aggression, territorial behavior, and social stress responses in laboratory animals. This ethological assessment places a test animal (intruder) into the home cage of an established resident, allowing researchers to observe and quantify aggressive interactions, dominance behaviors, and stress-related responses under controlled conditions.
The paradigm provides a naturalistic approach to studying social aggression by leveraging the innate territorial instincts of the resident animal. Behavioral endpoints include attack latency, attack duration, frequency of aggressive encounters, and various defensive postures. The test generates quantifiable data on social dominance hierarchies, stress-induced behavioral changes, and pharmacological interventions targeting aggression pathways.
How It Works
The Resident Intruder paradigm exploits the natural territorial instincts of laboratory animals, particularly rodents. A resident animal is established in its home cage for several days to weeks, allowing it to develop territorial behavior and scent marking. An unfamiliar intruder animal is then introduced into the resident's territory, triggering a predictable sequence of social behaviors.
The behavioral response follows an ethologically relevant pattern: initial investigation, threat displays, physical attacks, and establishment of dominance hierarchy. The resident typically displays territorial aggression including lateral attacks, biting, and chasing behaviors, while the intruder exhibits defensive postures such as freezing, submission, and escape attempts. These interactions activate the hypothalamic-pituitary-adrenal axis and release stress hormones, making the paradigm useful for studying both behavioral and physiological stress responses.
Data collection focuses on temporal and frequency measurements of specific behaviors: attack latency (time to first aggressive contact), total attack time, number of attacks, and duration of various social behaviors. Video recording allows for detailed ethological analysis and post-hoc behavioral scoring using standardized criteria.
Features & Benefits
Ethologically relevant paradigm
Provides naturalistic assessment of territorial aggression that translates well to wild-type behaviors and environmental contexts.
Standardized behavioral endpoints
Enables consistent quantification of aggressive behaviors across laboratories and experimental conditions for reproducible data collection.
Rapid behavioral response
Generates measurable aggressive interactions within minutes, allowing efficient screening of multiple experimental groups or pharmacological treatments.
Minimal equipment requirements
Requires only basic housing equipment and video recording capability, making it accessible for most research facilities without specialized apparatus.
Multiple behavioral measures
Simultaneously assesses attack frequency, duration, latency, and defensive behaviors to provide comprehensive aggression profiles.
Stress response integration
Combines behavioral analysis with physiological stress markers for comprehensive assessment of social stress and coping mechanisms.
Research identifiers
These IDs come from NCBI Taxonomy. Use them in data records and methods sections.
- Species
- Mouse
NCBITaxon:10090 - Rat
NCBITaxon:10116
- Mouse
Shipping weight
- 6.06 lb
Shipping box
- L: 65.0 cm
- W: 36.0 cm
- H: 27.0 cm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Behavioral Relevance | Ethologically natural territorial aggression assessment | Artificial aggression models often use shock-induced fighting | Natural territorial behavior provides better translational validity to real-world aggressive interactions. |
| Equipment Requirements | Basic housing and video recording setup | Other behavioral tests may require specialized chambers or shock delivery systems | Minimal equipment needs make the test accessible across diverse research settings. |
| Testing Duration | Rapid behavioral response within 10-20 minute sessions | Chronic social stress paradigms may require weeks of interaction | Efficient data collection enables higher throughput screening of experimental conditions. |
| Behavioral Endpoints | Multiple simultaneous measures including latency, duration, and frequency | Some aggression tests focus on single behavioral measures | Comprehensive behavioral profiling provides detailed characterization of aggressive phenotypes. |
The Resident Intruder paradigm offers a standardized approach to aggression assessment that balances ethological relevance with experimental control. The test provides rapid, quantifiable behavioral data using minimal specialized equipment while maintaining translational validity through natural territorial behavior activation.
| Model | SKU | Listed price | Status | Shipping box |
|---|---|---|---|---|
| Mouse | CS-958220-03 | $1,890.00 | Available | 65.0 × 36.0 × 27.0 cm |
| Rat | CS-958220-04 | $2,290.00 | Available | 65.0 × 36.0 × 27.0 cm |
| Mouse | CS-958220-03-BLUE | $1,890.00 | Available | 65.0 × 36.0 × 27.0 cm |
| Rat | CS-958220-04-BLUE | $2,290.00 | Available | 65.0 × 36.0 × 27.0 cm |
| Mouse | CS-958220-03-CLEAR | $1,890.00 | Available | 65.0 × 36.0 × 27.0 cm |
| Rat | CS-958220-04-CLEAR | $2,290.00 | Available | 65.0 × 36.0 × 27.0 cm |
| Mouse | CS-958220-03-GREY | $1,890.00 | Available | 65.0 × 36.0 × 27.0 cm |
| Rat | CS-958220-04-GREY | $2,290.00 | Available | 65.0 × 36.0 × 27.0 cm |
| Mouse | CS-958220-03-WHITE | $1,890.00 | Available | 65.0 × 36.0 × 27.0 cm |
| Rat | CS-958220-04-WHITE | $2,290.00 | Available | 65.0 × 36.0 × 27.0 cm |
Behavioral Pharmacology
Evaluating the anti-aggressive effects of pharmacological compounds by measuring changes in attack frequency and duration during resident-intruder encounters.
Neuroscience
Investigating the neural circuits underlying territorial aggression and social dominance through behavioral analysis combined with neuronal recording or optogenetic manipulation.
Social Behavior
Quantifying individual differences in aggressive temperament and social rank establishment to study behavioral phenotypes and their genetic or environmental determinants.
Anxiety and Depression
Assessing stress-induced behavioral changes and coping strategies by examining how chronic social stress affects subsequent aggressive behavior patterns.
Addiction Research
Studying the relationship between substance use and aggressive behavior by testing how drugs of abuse influence territorial responses and social interaction patterns.
Practical Tips
Best Practices
Conduct testing during the animal's active phase (dark cycle for nocturnal species) to maximize territorial behavior expression.
Why: Territorial aggression follows circadian patterns and is most pronounced during natural activity periods.
Best Practices
Use unfamiliar intruders for each test session to prevent habituation and maintain consistent territorial responses.
Why: Repeated exposure to the same intruder reduces territorial aggression through social recognition and habituation.
Data Quality
Record multiple camera angles or use mirror systems to capture behaviors that may be obscured by cage features.
Why: Complete behavioral observation is essential for accurate scoring of rapid aggressive interactions and defensive postures.
Safety
Establish predetermined intervention criteria and have separation tools readily available during testing.
Why: Excessive aggression can cause serious injury and must be controlled while maintaining experimental validity.
Troubleshooting
If residents show low aggression, verify territorial establishment through scent marking observation and extend housing period.
Why: Insufficient territorial behavior development is the most common cause of reduced aggressive responding.
Maintenance
Clean cages between testing sessions but preserve resident scent marks by partial cleaning protocols.
Why: Scent marking is crucial for territorial behavior, but excessive odors can confound behavioral responses.
Calibration
Validate behavioral scoring criteria through inter-rater reliability testing with experienced observers.
Why: Consistent behavioral definitions across scorers are essential for reproducible aggression quantification.
Setup Guide
Establish Resident Animals
House individual animals in their designated home cages for 7-14 days prior to testing to allow territorial behavior development and scent marking.
Prepare Testing Environment
Ensure testing room has appropriate lighting, temperature control, and video recording equipment positioned for optimal behavioral observation.
Select Intruder Animals
Choose intruder animals that are unfamiliar to residents, typically housed in separate rooms, and matched for size and age to minimize non-aggressive factors.
Configure Recording System
Set up video recording to capture the entire cage area with sufficient resolution for behavioral scoring, ensuring adequate frame rate for rapid movement analysis.
Conduct Habituation Session
Allow resident animals a brief acclimation period in the testing environment before introducing intruders to minimize handling stress artifacts.
Execute Testing Protocol
Introduce intruder into resident's cage and begin immediate behavioral observation, typically for 10-20 minute sessions depending on experimental design.
Monitor Safety Parameters
Establish clear endpoints for intervention to prevent excessive injury while maintaining experimental validity of aggressive interactions.
What’s in the Box
- Testing protocol documentation (typical)
- Behavioral scoring sheets (typical)
- Video recording setup guidelines (typical)
- Safety monitoring procedures (typical)
- Data analysis templates (typical)
Warranty
ConductScience provides comprehensive protocol support and technical consultation for implementing standardized resident-intruder testing procedures. Documentation and training materials are updated to reflect current best practices in behavioral assessment.
Compliance
IACUC GuidelinesCommonly used in behavioral research protocols reviewed by Institutional Animal Care and Use Committees for assessment of social stress and aggression studies.
NIH Guidelines for Animal ResearchSupports behavioral research conducted under NIH funding requirements for studying social behavior and stress responses in laboratory animals.
References
Background reading relevant to this product:
1.Jaap M. Koolhaas et al. (2013) “The Resident-intruder Paradigm: A Standardized Test for Aggression, Violence and Social Stress” Journal of Visualized Experiments doi:10.3791/4367
2.A. Raab et al. (1986) “Behavioural, physiological and immunological consequences of social status and aggression in chronically coexisting resident-intruder dyads of male rats” Physiology & Behavior doi:10.1016/0031-9384(86)90007-7
3.Seema Bhatnagar et al. (2003) “Facilitation of hypothalamic–pituitary–adrenal responses to novel stress following repeated social stress using the resident/intruder paradigm” Hormones and Behavior doi:10.1016/s0018-506x(02)00011-9
4.Steven F. de Boer et al. (1999) “Selective Antiaggressive Effects of Alnespirone in Resident-Intruder Test Are Mediated via 5-Hydroxytryptamine1A Receptors: A Comparative Pharmacological Study with 8-Hydroxy-2-Dipropylaminotetralin, Ipsapirone, Buspirone, Eltoprazine, and WAY-100635” Journal of Pharmacology and Experimental Therapeutics doi:10.1016/s0022-3565(24)38065-6
5.Karl Ebner et al. (2004) “Neuroendocrine and behavioral response to social confrontation: residents versus intruders, active versus passive coping styles” Hormones and Behavior doi:10.1016/j.yhbeh.2004.08.002
Q
What is the optimal duration for establishing territorial behavior in resident animals?
A
Residents typically require 7-14 days of individual housing to develop strong territorial behavior and scent marking. Longer establishment periods may increase territorial aggression but must be balanced against housing stress effects.
Q
How do you control for size differences between resident and intruder animals?
A
Match animals within 10-15% body weight when possible. Significant size differences can confound aggression measures, as larger animals may display dominance through physical advantage rather than territorial behavior.
Q
What behavioral measures are most reliable for quantifying aggression?
A
Attack latency and total attack duration provide the most consistent measures. Frequency counts can be affected by brief, repeated contacts, while sustained aggressive interactions better reflect territorial dominance.
Q
How do you minimize injury risk while maintaining experimental validity?
A
Establish clear intervention criteria such as prolonged pinning, visible injury, or extreme defensive postures. Brief aggressive encounters are normal, but continuous attacking requires separation to prevent harm.
Q
Can the paradigm be adapted for different species beyond rodents?
A
The basic principles apply to other territorial species, but behavioral endpoints and timing parameters require species-specific validation. Social structure and territorial displays vary significantly across species.
Q
What environmental factors can influence test results?
A
Room lighting, noise levels, handling stress, and cage cleaning schedules all affect territorial behavior. Standardize these variables and conduct testing at consistent times to minimize confounding factors.
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Score this test with ConductVision
ConductVision is our video-tracking software. Record your sessions on video, and it reports the measures listed below.
What it measures
Aggression & Fighting
- Aggression Bouts
- Attack Latency
- Bout Duration
- Total Aggression Time
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Resident Intruder
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