Acrylic chamber system for contextual and cued fear conditioning studies in mice and rats, featuring interchangeable visual contexts and integrated video tracking capability.
Director of Science · ConductScience
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The Fear Conditioning System provides a controlled environment for studying associative learning and memory formation in rodents. This acrylic chamber system enables researchers to conduct contextual and cued fear conditioning experiments, fundamental paradigms in behavioral neuroscience for investigating amygdala-dependent learning processes. The system accommodates both mouse and rat subjects with species-specific chamber inserts and includes multiple visual context configurations.
The apparatus consists of a main grey acrylic chamber (50 × 40 × 50 cm) with removable inserts for mice (17 × 17 × 25 cm) or rats (26 × 26 × 30 cm). Five interchangeable acrylic plate designs (striped, chessboard, grey, white, black) allow contextual manipulation between training and testing phases. A customizable camera holder accommodates the recommended DMK 22AUC03 camera for behavioral tracking and freezing analysis.
Fear conditioning operates on classical Pavlovian learning principles, where a neutral stimulus (conditioned stimulus, CS) becomes associated with an aversive unconditioned stimulus (US) through temporal pairing. In contextual fear conditioning, the chamber environment itself serves as the CS, while in cued conditioning, a discrete auditory or visual cue functions as the CS. The US typically consists of a mild footshock delivered through the chamber floor.
During the acquisition phase, subjects learn to associate the CS with the US, forming a fear memory that manifests as freezing behavior upon re-exposure to the CS. Freezing, defined as the absence of movement except for respiration, serves as the primary behavioral readout and reflects amygdala-mediated fear memory expression. The system's interchangeable plate designs enable context manipulation, allowing researchers to distinguish between hippocampus-dependent contextual memories and amygdala-dependent cued memories.
Video tracking through the integrated camera system quantifies freezing duration and movement patterns, providing objective measures of fear memory strength. The modular design supports various experimental protocols including acquisition, extinction, renewal, and reinstatement paradigms essential for understanding fear memory dynamics.
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Species accommodation | Dual compatibility with dedicated mouse (17×17×25 cm) and rat (26×26×30 cm) inserts | Single species design or universal chambers without optimized dimensions | Provides species-appropriate spatial constraints for natural freezing behavior without requiring separate apparatus. |
| Context manipulation options | Five interchangeable acrylic plates (striped, chessboard, grey, white, black) | Fixed context design or limited plate options | Enables comprehensive contextual conditioning studies and context-dependent memory research within a single system. |
| Video integration | Customizable camera holder with recommended DMK 22AUC03 compatibility | External camera mounting or fixed positioning systems | Provides standardized video capture setup for consistent behavioral tracking and automated analysis across experiments. |
| Chamber construction | Modular acrylic design with removable components | Stainless steel or fixed acrylic constructions | Facilitates rapid cleaning and sterilization while providing clear visual access for real-time behavioral observation. |
| System modularity | Interchangeable inserts and plates for protocol flexibility | Fixed configuration systems | Allows rapid protocol switching and multi-paradigm studies without equipment changes or additional chamber requirements. |
This system combines species-specific optimization with contextual flexibility through its modular design and comprehensive plate selection. The integrated camera mounting and standardized dimensions provide consistent experimental conditions while accommodating diverse fear conditioning protocols.
| Model | SKU | Listed price | Status | Dimensions |
|---|---|---|---|---|
| Rat | ME-FCM-R | $6,900.00 | Available | 43.2 x 38.0 x 27.9 cm |
| Mouse | ME-FCM-M | $5,900.00 | Available | 66.04 x 66.04 x 53.34 cm |
Calibrate shock intensity using a digital multimeter before each experimental session and document actual delivered current.
Why: Shock generators can drift over time, affecting the reliability of conditioning and experimental reproducibility.
Inspect acrylic surfaces weekly for scratches or stress fractures that could create hiding spots or visual artifacts.
Why: Damaged surfaces can influence animal behavior and compromise video tracking accuracy.
Allow 10-15 minutes between subjects in the same chamber to ensure complete odor elimination and temperature stabilization.
Why: Residual olfactory cues from previous subjects can alter baseline anxiety levels and conditioning responses.
Record ambient temperature and humidity during sessions as these parameters can influence freezing behavior baselines.
Why: Environmental conditions affect animal comfort and stress levels, potentially confounding fear conditioning measurements.
If subjects show excessive baseline freezing, reduce ambient lighting levels and check for external vibration sources.
Why: High baseline freezing reduces the dynamic range for detecting conditioned fear responses and may indicate environmental stressors.
Always test shock delivery with an oscilloscope or current meter before introducing animals to verify proper waveform characteristics.
Why: Improper shock parameters can cause tissue damage or inconsistent conditioning, compromising both animal welfare and experimental validity.
Randomize plate design assignment across treatment groups to control for potential context-dependent effects on conditioning.
Why: Different visual patterns may have inherent salience differences that could introduce bias in fear conditioning responses.
Validate automated freezing detection by manually scoring a subset of sessions to ensure algorithm accuracy for your experimental conditions.
Why: Tracking software parameters may require adjustment based on lighting conditions, animal strain, or chamber configuration to maintain scoring accuracy.
ConductScience provides a one-year manufacturer warranty covering defects in materials and workmanship, with technical support for system setup and protocol optimization.
Background reading relevant to this product:
What is the Fear Conditioning System?
The Fear Conditioning System is a behavioral apparatus that pairs an auditory or contextual cue with a mild foot shock, enabling researchers to study associative learning, memory consolidation, and fear responses in rodents.
How does the Fear Conditioning System work?
During training, a tone (conditioned stimulus) is paired with a brief foot shock (unconditioned stimulus) in a specific context. During testing, freezing behavior in response to the tone or context is measured as an index of fear memory.
What research applications use the Fear Conditioning System?
Fear conditioning is central to PTSD research, amygdala function studies, and memory consolidation research. It is widely used in drug development for anxiolytics and in studies of synaptic plasticity and extinction learning.
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Automated freezing detection from chamber video, separating immobility from sleep or grooming and time-locking motion to the conditioned stimulus and shock periods.
ConductVision Fear Conditioning ->No exact ConductMaze fear-conditioning protocol page is currently published. Conditioning, context, and cued-recall sessions are normally run on the chamber controller rather than a maze protocol; keep this as a roadmap gap.
Supporting page not yet builtSummarize percent freezing across baseline, CS, and context epochs, shock reactivity, and the cued-freezing fraction with quality-control flags.
Fear Conditioning Analyzer ->Configuration considerations
Use these notes to scope species, cohort, tracking, and automation needs. Only verified product or support routes are linked from this section.
Sound-attenuating enclosure with grid-floor shocker, speaker, house light, and overhead camera
Standard configuration for cued and contextual conditioning, recording percent freezing across baseline, CS presentations, and context re-exposure with a calibrated grid-floor shocker.
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Request QuoteEnclosure volume, grid-bar spacing, and current range scaled for mouse or rat body size
Grid-bar spacing and current calibration change how the unconditioned stimulus is delivered, so the chamber geometry should match the species and body weight being tested.
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View options ->Interchangeable wall, floor, and odor inserts for distinct conditioning and test contexts
Best when the question is context discrimination or extinction across sessions, where distinct visual, tactile, and odor cues are needed to separate contextual from cued recall.
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Request automation help§ 1
The Fear Conditioning System measures associative learning by pairing a neutral conditioned stimulus (CS) with an aversive unconditioned stimulus and recording the conditioned freezing response. Fanselow characterized freezing as the dominant species-typical response after foot shock, which made percent freezing a tractable, automatable readout of learned associations. 1
Cued and contextual conditioning dissociate distinct circuits: differential lesion work shows the amygdala is required for the cued response while the hippocampus contributes to contextual memory. Recording baseline, CS, and context epochs separately lets a single apparatus report both forms of learning from one cohort. 1
Shock calibration, context generalization, baseline locomotor activity, and the freezing-detection threshold all change percent freezing independent of true memory. A defensible protocol calibrates and reports shock current, separates conditioning and test contexts, verifies shock reactivity as a quality-control check, and fixes the freezing threshold before any data are scored. 1
§ 2
Cued and contextual acquisition with calibrated shock delivery, epoch-locked freezing scoring, and shock-reactivity quality control.
Critical methodological constraints
Core fear-conditioning endpoints for cued and contextual learning, with shock-reactivity and tracking quality control.
Cued Freezing
Conditioned response
Contextual Freezing
Context memory
Baseline Freezing
Pre-CS control
Shock Reactivity
Unconditioned response and QC
Motion Index
Tracking QC
+ Additional metrics: freezing-bout count and duration, latency to first freeze, per-CS freezing across trials, time of day, chamber ID, and per-session apparatus notes.
A compact fraction of recorded freezing time that fell within the cued CS period versus outside it.
Estimate the N per group needed to detect a literature-anchored conditioning effect at the endpoint you plan to report. Override the defaults with your own pilot numbers.
§ 3
Aggregate publication data, sample apparatus output, and recent findings from the live PubMed feed.
PubMed volume and co-occurring behavioral methods for rodent fear-conditioning studies.
Representative output from a cued-and-contextual fear conditioning session.
Fear-conditioning methods continue to emphasize shock calibration and distinct conditioning versus test contexts.
Static methods note aligned with Fanselow (1980), Phillips & LeDoux (1992), and Anagnostaras et al. (2010).
Review fear-conditioning studies for measured and reported shock current, distinct conditioning and test contexts, a fixed freezing-detection threshold, and shock-reactivity quality control before interpreting cued versus contextual freezing.
Cued and contextual freezing as separable readouts: report baseline and shock reactivity alongside conditioned epochs.
Static methods note aligned with Maren (2001) and Curzon et al. (2009).
Percent freezing in a single epoch is a screening signal. A specific learned association is most defensible when cued and contextual freezing are contrasted against the pre-CS baseline and matched shock reactivity in the same cohort.
§ 4
Limitations of the paradigm, methodological caveats, and current directions.
Variables that shift Fear Conditioning System results independent of anxiety state.
Uncalibrated grid current makes the unconditioned stimulus vary between chambers and sessions, changing acquisition independent of the manipulation. Measure and report current.
When the test context resembles the conditioning context, cued freezing is inflated by contextual recall. Distinct cues are needed to keep the two epochs separable.
Naturally low-activity animals can register as freezing before any CS, biasing percent-freezing comparisons. Report and reference the pre-CS baseline.
Motion thresholds and minimum bout length change measured percent freezing, so an inconsistent threshold can manufacture or hide group differences.
Residual urine and odor act as carry-over contextual cues for the next subject. Standardize cleaning between animals and between contexts.
## Fear Conditioning System — methods controls Confounds controlled in this protocol: - **Shock calibration.** Uncalibrated grid current makes the unconditioned stimulus vary between chambers and sessions, changing acquisition independent of the manipulation. Measure and report current. - **Context generalization.** When the test context resembles the conditioning context, cued freezing is inflated by contextual recall. Distinct cues are needed to keep the two epochs separable. - **Baseline locomotor activity.** Naturally low-activity animals can register as freezing before any CS, biasing percent-freezing comparisons. Report and reference the pre-CS baseline. - **Freezing-detection threshold.** Motion thresholds and minimum bout length change measured percent freezing, so an inconsistent threshold can manufacture or hide group differences. - **Chamber cleaning and odor cues.** Residual urine and odor act as carry-over contextual cues for the next subject. Standardize cleaning between animals and between contexts.
Fear conditioning is strongest when shock current, context cues, the CS parameters, and the freezing threshold are fixed and reported before testing. Percent freezing in one epoch is a screening signal; confirm a specific association by contrasting cued and contextual freezing against baseline and shock reactivity in the same cohort. 1
Test contextual recall in the original conditioning context without the CS, then test cued recall in a distinct context with the CS. Distinct visual, tactile, and odor cues are what keep the two epochs interpretable.
Shock reactivity confirms the unconditioned stimulus was delivered and detected equally across groups. A group difference in freezing is hard to attribute to learning if shock reactivity also differs.
Automated motion-index scoring is reproducible if the threshold and minimum bout length are fixed in advance and applied identically across groups. Validate the threshold against hand scoring on a subset before relying on it.
Quarterly editorial review of emerging Fear Conditioning System methodology. Q2 2026
Calibrating and reporting grid-floor current across rigs improves comparability of acquisition and freezing between labs and chamber models.
Camera-based motion scoring with fixed thresholds reduces observer burden and captures freezing bouts and latency consistently across sessions.
Explicit distinct conditioning and test contexts are increasingly expected to dissociate cued from contextual recall within one cohort.
Multi-session extinction and context-renewal designs are paired with the same chamber to study the durability and context dependence of learned associations.
§ 5
7 selected methods and validation references for Fear Conditioning System.
