Thermal Gradient
Linear thermal gradient platform with 10 individually controlled zones (-5°C to +70°C) for assessing thermal preference and pain sensitivity in rodents across 20 temperature zones.
Louise Corscadden, PhD
Neuroscience · ConductScience
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The Thermal Gradient apparatus provides precise temperature control across a linear platform to assess thermal preference and pain sensitivity in rodents. The system features 10 individually controlled zones creating 20 total temperature zones (arranged in 2 rows of 10 adjacent plates) with temperature control ranging from -5°C to +70°C in 1-degree increments. The 120 cm aluminum alloy base plate ensures uniform heat distribution while the transparent PPC top cover allows for behavioral observation during testing.
This apparatus enables researchers to quantify thermal preference, thermal hyperalgesia, and cold allodynia responses by allowing animals to freely explore and select preferred temperatures along the gradient. The system integrates with video tracking software for automated behavioral analysis and includes data export capabilities with automatic calculation of statistical parameters for efficient data management.
How It Works
The thermal gradient test operates on the principle of free choice behavior, where animals can move along a temperature continuum to select their preferred thermal environment. The apparatus creates a linear thermal gradient through 10 independently controlled aluminum plates arranged in two parallel rows, generating 20 distinct temperature zones across the 120 cm platform length.
Each zone maintains precise temperature control within 1-degree accuracy, allowing researchers to establish gradients from hypothermic (-5°C) to nociceptive (70°C) ranges. Animals placed on the gradient naturally explore the platform and demonstrate preference by spending differential time in specific temperature zones. The aluminum alloy construction ensures rapid and uniform heat transfer, while the transparent top cover enables direct behavioral observation without thermal interference.
Behavioral responses are quantified by measuring time spent, distance traveled, and movement patterns within each temperature zone. The system integrates with video tracking software to automatically record position and calculate preference indices, thermal thresholds, and avoidance latencies for objective pain assessment.
Features & Benefits
temperature_zones
- 10 zones for individual control
total_zones
- 20 total temperature zones (10 adjacent plates in 2 rows)
base_plate_material
- Aluminum alloy
wall_material
- Grey PPC
top_cover_material
- Transparent PPC
data_export
- Excel export capability
data_calculations
- Autocalculation of mean, std dev
compatible_software
- Noldus EthoVision® XT video tracking system
Behavioral Construct
- thermal preference
- thermal hyperalgesia
- cold allodynia
- nociceptive behavior
- pain threshold
- thermal avoidance
- thermoregulation
Automation Level
- semi-automated
Material
- Aluminum alloy
- Grey PPC
- Transparent PPC
Color
- Grey
- Transparent
Temperature Range
- -5°C to +70°C
Accuracy
- 1 degree stepwise
Species
- Mouse
- Rat
Research Domain
- Addiction Research
- Behavioral Pharmacology
- Neurodegeneration
- Neuroscience
- Pain Research
- Toxicology
Compatible Tracking Software
- ConductVision
Weight
- 6.06 kg
Dimensions
- L: 120.0 mm
- W: 10.0 mm
- H: 15.0 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Number of Temperature Zones | 10 individually controlled zones creating 20 total testing positions | Basic models often provide 3-5 zones with fewer control options | Greater spatial resolution enables detection of subtle preference shifts and more precise thermal threshold determination |
| Temperature Range and Accuracy | -5°C to +70°C with 1-degree stepwise control | Limited models may offer narrower ranges or lower precision control | Comprehensive coverage from hypothermic to nociceptive ranges with high precision for detecting small threshold changes |
| Platform Length | 120 cm linear gradient | Shorter platforms may restrict natural exploratory behavior | Extended length accommodates natural movement patterns and reduces edge effects in behavioral analysis |
| Data Integration | Excel export with automatic statistical calculations and EthoVision XT compatibility | Manual data recording or limited software integration | Automated analysis reduces human error and accelerates data processing for high-throughput studies |
| Construction Materials | Aluminum alloy base with PPC walls and transparent cover | Basic models may use less efficient heat transfer materials | Optimal thermal conductivity ensures rapid temperature equilibration and uniform gradient establishment |
| Zone Configuration | Dual-row design with 20 total temperature zones | Single-row configurations with fewer testing positions | Higher throughput capability and bilateral testing options for increased experimental efficiency |
This thermal gradient system provides comprehensive temperature control with 10 independent zones across a 120 cm platform, offering superior spatial resolution and temperature precision compared to basic gradient systems. The dual-row configuration and advanced data integration capabilities support both high-throughput screening and detailed behavioral analysis workflows.
Practical Tips
Verify temperature accuracy using an independent digital thermometer at the center of each zone, as edge effects may cause slight temperature variations.
Why: Ensures precise thermal stimuli delivery for reproducible pain threshold measurements.
Clean the aluminum base plate weekly with mild soap solution and dry thoroughly to maintain optimal heat transfer properties.
Why: Buildup of organic residues can create thermal barriers affecting gradient uniformity.
Acclimate animals to the testing environment for 30 minutes before thermal testing to reduce stress-induced behavioral artifacts.
Why: Stress responses can confound thermal preference measurements and affect pain sensitivity.
Record ambient room temperature and humidity during each session as these factors can influence animal thermal preference behaviors.
Why: Environmental variables help explain variability in thermal preference data and improve result interpretation.
If temperature zones show uneven heating, check for loose connections at temperature sensor probes and ensure proper thermal contact.
Why: Poor sensor contact leads to inaccurate temperature feedback and unstable thermal gradients.
Use the transparent cover at all times during testing to prevent animal escape and protect against accidental contact with heated surfaces.
Why: Prevents injury to both animals and researchers while maintaining controlled testing conditions.
Randomize starting positions across multiple test sessions to prevent positional bias in thermal preference measurements.
Why: Animals may develop spatial preferences independent of temperature that confound thermal sensitivity data.
Allow 45-60 minutes of warm-up time when switching from cold to hot temperature ranges to ensure complete thermal equilibration.
Why: Aluminum thermal mass requires adequate time to reach stable temperatures across large temperature changes.
Setup Guide
What’s in the Box
- Thermal gradient apparatus with aluminum base plate
- Temperature control system for 10 zones
- Grey PPC wall assembly
- Transparent PPC top cover
- Power supply and control cables
- Temperature calibration certificate (typical)
- User manual and protocol guide (typical)
- Data collection software (typical)
Warranty
ConductScience provides a standard 1-year manufacturer warranty covering defects in materials and workmanship, with technical support for setup, calibration, and troubleshooting. Extended warranty and service contracts are available for high-throughput research facilities.
Compliance
What temperature gradients are typically used for detecting thermal hyperalgesia in neuropathic pain models?
Standard protocols establish gradients from 10°C to 50°C in 4-5 degree increments, with hyperalgesic animals showing increased avoidance of temperatures above 35-40°C compared to controls. The 1-degree accuracy enables detection of subtle threshold shifts.
How long should thermal equilibration time be before starting behavioral testing?
Allow minimum 30 minutes for complete thermal equilibration across all zones after setting temperatures. Verify stability with independent temperature measurements before introducing animals to ensure consistent thermal gradients.
What video tracking parameters are most important for thermal preference analysis?
Key parameters include zone occupancy time, transition frequency between zones, and movement velocity within each temperature range. Configure 2-5 cm zone boundaries in tracking software to match physical temperature plate divisions.
Can the system accommodate different rodent species and age groups?
The 120 cm length and 10 cm width accommodate mice, rats, and juvenile animals. Transparent top cover height of 15 cm prevents escape while allowing natural movement. Adjust test duration based on species mobility patterns.
How frequently should temperature calibration be performed?
Perform monthly calibration verification using independent temperature probes at each zone. Daily verification of 2-3 key zones is recommended for studies requiring high precision thermal threshold measurements.
What maintenance procedures are required for consistent performance?
Clean aluminum surfaces weekly with mild detergent to maintain heat transfer efficiency. Inspect temperature sensors quarterly and recalibrate annually or after any maintenance involving heating elements.
How does this system compare to hot plate or cold plate testing methods?
Unlike binary choice tests, the thermal gradient provides continuous temperature selection allowing detection of subtle preference changes and establishment of thermal preference curves rather than simple threshold measurements.
What statistical approaches are recommended for analyzing thermal preference data?
Use time-weighted temperature preference calculations and area-under-curve analysis for preference profiles. The system's Excel export includes automatic mean and standard deviation calculations for zone occupancy data.
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