Morris Water Y Maze
Y-shaped acrylic maze insert for Morris Water Maze systems that enables spatial choice discrimination and working memory assessment in rodents through escape platform localization tasks.
Louise Corscadden, PhD
Director of Science · ConductScience
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The Morris Water Y Maze insert transforms the traditional Morris Water Maze into a spatial choice paradigm, combining the strengths of both Y-maze discrimination learning and water-based escape motivation. This Y-shaped acrylic insert features three arms positioned at 120-degree angles, creating a more naturalistic navigation structure compared to traditional T-maze configurations with sharp 90-degree turns.
The system enables researchers to assess spatial learning, working memory, and visual discrimination in rodents by requiring subjects to choose between two goal arms to locate a submerged escape platform. The smooth arm transitions and configurable platform placement support various experimental protocols including reference memory tasks, working memory assessments, and discrimination learning paradigms. Available in three sizes to accommodate 4-foot, 5-foot, and 6-foot Morris Water Maze systems.
How It Works
The Morris Water Y Maze operates on the principle of spatial discrimination learning combined with negative reinforcement through escape motivation. Rodents are placed in opaque water and must navigate to one of two goal arms to locate a submerged escape platform positioned approximately 2 cm below the water surface. The Y-shaped configuration creates three distinct spatial zones with 120-degree arm separations, allowing for more natural movement patterns compared to right-angle maze designs.
Spatial learning is assessed through choice accuracy between the two goal arms, with visual cues positioned above the target arm to guide navigation. The water opacity, achieved through non-toxic agents like watercolor paint or powdered milk, prevents subjects from seeing the platform directly, requiring reliance on spatial memory and visual discrimination. Trial parameters typically include a 200-second timeout period, with performance measured through choice accuracy, escape latency, and swimming path analysis via compatible tracking software.
Features & Benefits
maze_configuration
- Y-shape with three arms at 120-degree angles
arm_length
- 30 to 50 cm
arm_width
- 10 cm
platform_submersion_depth
- approximately 2 cm below water surface
trial_timeout
- 200 seconds
compatible_tub_sizes
- ['4 Feet', '5 Feet', '6 Feet']
water_opacity_agents
- non-toxic substances like watercolor paint or powdered milk
optional_features
- ['guillotine-like doors', 'visual cues above goal arms', 'removable escape platform']
Behavioral Construct
- spatial learning
- working memory
- spatial discrimination
- reference memory
- visual discrimination
Automation Level
- semi-automated
Research Domain
- Anxiety and Depression
- Behavioral Pharmacology
- Learning and Memory
- Neurodegeneration
- Neuroscience
Species
- Mouse
- Rat
Compatible Tracking Software
- ConductVision
Weight
- 21.0 kg
Dimensions
- L: 43.2 mm
- W: 38.0 mm
- H: 27.9 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Arm Configuration Angle | 120-degree arm separation for natural movement patterns | Most maze systems use 90-degree angles creating forced turns | Reduces motor confounds and allows more natural swimming trajectories during spatial navigation tasks |
| Integration Compatibility | Designed specifically for Morris Water Maze systems (4, 5, and 6-foot sizes) | Standalone maze systems require separate apparatus and room space | Maximizes existing equipment investment while adding choice discrimination capabilities to established protocols |
| Platform Control System | Removable escape platform with 2 cm submersion depth specification | Fixed platform systems or manual adjustment methods | Enables precise experimental control and rapid protocol modifications between experimental conditions |
| Temporal Access Control | Optional guillotine-like door mechanisms for arm access timing | Manual blocking methods or no temporal control options | Supports complex behavioral paradigms including working memory and delayed matching protocols |
| Tracking Software Integration | Noldus Ethovision XT compatibility with zone-specific analysis | Generic video tracking requiring custom zone configuration | Provides standardized analysis protocols specifically optimized for Y-maze choice discrimination data |
| Water Opacity Management | Specified non-toxic opacity agents (watercolor paint, powdered milk) | Various opacity methods with inconsistent specifications | Ensures consistent visual conditions and animal welfare standards across experimental sessions |
This Morris Water Y Maze insert combines the established motivational benefits of water-based escape learning with structured spatial choice discrimination, providing 120-degree arm configurations that support natural movement patterns while maintaining compatibility with existing Morris Water Maze systems and standardized tracking software.
| Model | SKU | Listed price | Status | Dimensions |
|---|---|---|---|---|
| Rat | ME-3137 | $2,100.00 | Available | 43.2 x 38.0 x 27.9 cm |
| Mouse | ME-3135 | $1,800.00 | Available | 43.2 x 38.0 x 27.9 cm |
Practical Tips
Verify arm angle measurements at 120 degrees using a protractor before initial use and after any reassembly to ensure consistent spatial relationships.
Why: Precise arm positioning is critical for standardized spatial discrimination and data reproducibility across experimental sessions.
Clean the insert thoroughly with mild detergent between subjects and inspect for algae growth in arm corners where water circulation may be reduced.
Why: Residual odor cues or visual artifacts can influence choice behavior independent of spatial learning variables.
Counterbalance platform location across subjects within experimental groups and maintain consistent visual cue positioning throughout the testing period.
Why: Systematic platform placement prevents confounding spatial biases and ensures that group differences reflect treatment effects rather than apparatus variables.
If subjects show persistent arm bias unrelated to platform location, verify water flow patterns and check for asymmetric visual cues or reflections.
Why: Uncontrolled environmental factors can create artificial spatial preferences that mask genuine learning and memory effects.
Record both first choice accuracy and total choice patterns, as subjects may correct initial errors through within-trial learning.
Why: Multiple choice measures provide more comprehensive assessment of spatial learning strategies and decision-making processes.
Monitor water temperature consistency across arm locations and maintain non-slip surfaces around the apparatus to prevent researcher accidents.
Why: Temperature gradients can create unintended spatial cues, while wet surfaces present slip hazards during rapid subject handling between trials.
Allow subjects to acclimate to water temperature for 30-60 seconds in a neutral location before trial initiation to minimize thermal shock effects.
Why: Thermal acclimation reduces stress-related swimming behaviors that can interfere with spatial learning performance assessment.
Document swimming speed and path efficiency in addition to choice accuracy to distinguish between motor and cognitive performance variables.
Why: Comprehensive behavioral measurement helps identify whether performance changes reflect learning improvements or altered locomotor capacity.
Setup Guide
What’s in the Box
- Y-maze acrylic insert assembly
- Removable escape platform
- Installation and setup guide
- Recommended water opacity agent specifications (typical)
- Visual cue mounting hardware (if applicable)
Warranty
ConductScience provides a standard one-year manufacturer warranty covering defects in materials and workmanship, with technical support for setup and experimental protocol optimization.
Compliance
References
Background reading relevant to this product:
What water depth and opacity levels are optimal for reliable platform concealment?
Maintain water depth sufficient to submerge the platform 2 cm below surface level, with opacity achieved through non-toxic agents like watercolor paint or powdered milk until the platform is not visible from above.
How do trial parameters compare between Y-maze and traditional Morris Water Maze protocols?
The Y-maze insert maintains the 200-second trial timeout standard but focuses on choice accuracy between two goal arms rather than open-field platform searching, requiring modified analysis of spatial vs. choice learning components.
Can the insert accommodate working memory protocols with arm alternation requirements?
Yes, the optional guillotine-like door system enables temporal control over arm access, supporting delayed matching tasks and forced alternation paradigms for working memory assessment.
What tracking software modifications are needed for Y-maze configuration analysis?
Noldus Ethovision XT requires zone definitions for the three arms and choice point area, with modified analysis parameters focusing on arm selection accuracy, choice latency, and path efficiency rather than quadrant analysis.
How does the 120-degree arm configuration affect swimming behavior compared to 90-degree turns?
The 120-degree angles reduce forced turning behaviors and allow more natural swimming trajectories, potentially reducing motor confounds in spatial learning assessment while maintaining clear spatial discrimination requirements.
What platform placement strategies optimize learning acquisition across different experimental groups?
Platform location should be counterbalanced across subjects within experimental groups, with consistent spatial cue relationships maintained throughout testing to ensure reliable spatial learning assessment.
Are there specific water temperature requirements for Y-maze protocols?
Maintain water temperature between 20-25°C for optimal animal welfare and consistent behavioral performance, as temperature variations can affect swimming motivation and choice behavior independent of spatial learning.
How do data analysis requirements differ from standard Morris Water Maze protocols?
Analysis focuses on choice accuracy percentages, first choice correctness, and arm selection latency rather than quadrant preference and path length measures typical in open-field Morris Water Maze protocols.
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