Incline Rolling Ladder
A 45-degree inclined ladder with dual-surface rungs for assessing tactile and proprioceptive function in rodents, particularly sensitive to dorsal column pathway deficits.
Louise Corscadden, PhD
Director of Science · ConductScience
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The Incline Rolling Ladder (ME-5010) is a specialized behavioral testing apparatus designed to assess tactile and proprioceptive function in rodents. This test is particularly sensitive to functional deficits affecting the dorsal column pathway, which transmits sensory information including touch, vibration, and proprioception to the brainstem. The apparatus features a 34 cm ladder set at a 45-degree incline with 9 adjustable rungs, each containing both smooth mobile and textured immobile surfaces to challenge sensorimotor integration.
Originally developed by Fagoe et al. for detecting functional changes following dorsal column lesions, this test addresses limitations of traditional motor assessments that may miss subtle tactile and proprioceptive impairments. The dual-surface rung design requires animals to distinguish between stable and unstable footing, making it particularly valuable for evaluating recovery following spinal cord injury, peripheral nerve damage, or other conditions affecting somatosensory function.
How It Works
The incline rolling ladder test exploits the fundamental principle that successful locomotion requires continuous integration of tactile and proprioceptive feedback. As rodents ascend the 45-degree inclined ladder, they must distinguish between the stable textured surface and the unstable smooth mobile surface on each rung. This discrimination requires intact dorsal column-medial lemniscal pathway function, which transmits fine touch and proprioceptive information from peripheral mechanoreceptors to the somatosensory cortex.
The dual-surface rung design creates a choice point at each step where animals must rely on tactile cues to identify the stable footing surface. Animals with intact sensory function quickly learn to step preferentially on the textured, immobile surface. However, those with dorsal column lesions or other sensory pathway deficits show increased foot slips, longer completion times, and greater reliance on visual rather than tactile cues. The 9 adjustable rungs allow for systematic variation of task difficulty by altering rung spacing or surface properties.
The test's sensitivity stems from its requirement for fine tactile discrimination under challenging postural conditions. Unlike simple locomotor tests that may be compensated by visual or vestibular cues, the rolling ladder specifically taxes the dorsal column pathway's contribution to skilled reaching and stepping behaviors.
Features & Benefits
incline_angle
- 45 degrees
number_of_rungs
- 9 adjustable rungs
rung_sections
- Two sections per rung - one smooth and movable, one textured and stationary
platform
- Landing platform at top
trials_per_day
- 3 trials per subject
training_duration
- Daily training for 2 weeks before baseline
testing_duration
- Weekly for 8-12 weeks post-treatment
Behavioral Construct
- Tactile discrimination
- Proprioception
- Sensorimotor integration
- Fine motor coordination
- Skilled reaching
Automation Level
- manual
Species
- Mouse
- Rat
Dimensions
- 34 cm
Research Domain
- Aging Research
- Behavioral Pharmacology
- Motor Function
- Neurodegeneration
- Neuroscience
- Pain Research
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 |
|---|---|---|---|
| Tactile Discrimination Challenge | Dual-surface rungs with textured stable and smooth mobile sections | Standard ladder tests use uniform rung surfaces without tactile discrimination requirements | Specifically targets dorsal column pathway function rather than general motor coordination. |
| Incline Angle | Fixed 45-degree angle | Many tests use horizontal or variable angle configurations | Optimal angle challenges proprioceptive systems while maintaining animal safety and task feasibility. |
| Rung Adjustability | 9 adjustable rungs for customizable spacing | Fixed rung spacing in most ladder apparatuses | Allows protocol optimization for different species and experimental requirements. |
| Protocol Standardization | Established 2-week training with 3 trials per day and 8-12 week testing protocol | Variable training periods and testing frequencies | Validated protocol parameters ensure reliable baseline establishment and longitudinal tracking. |
| Sensory Pathway Specificity | Specifically validated for dorsal column lesion detection | General motor tests may miss subtle sensory pathway deficits | Higher sensitivity to tactile and proprioceptive impairments that may not affect gross motor function. |
The Incline Rolling Ladder offers unique tactile discrimination challenges through its dual-surface rung design and validated protocol for dorsal column pathway assessment. The 45-degree incline with 9 adjustable rungs provides standardized yet flexible testing conditions for longitudinal sensorimotor evaluation.
Practical Tips
Allow animals to acclimate to the testing room for 30 minutes before each session to minimize stress-related performance variability.
Why: Environmental stress can mask subtle sensory deficits by overwhelming the animal's sensory processing capacity.
Verify the 45-degree incline angle weekly using a digital inclinometer to maintain protocol consistency.
Why: Even small changes in incline angle can significantly affect task difficulty and proprioceptive challenge.
Clean textured and smooth rung surfaces with appropriate disinfectant between subjects to prevent scent cues from influencing performance.
Why: Olfactory cues can provide alternative navigation strategies that bypass the intended tactile discrimination challenge.
Record sessions from multiple camera angles to accurately score foot placement preferences and slip occurrences.
Why: Side and frontal views provide complementary information needed for precise quantification of tactile discrimination behavior.
If animals consistently avoid the apparatus, reduce incline angle temporarily during initial training phases before returning to 45 degrees.
Why: Progressive difficulty increase helps establish task engagement while maintaining the eventual protocol validity.
Place soft bedding material at the base of the apparatus during initial training sessions to cushion potential falls.
Why: Early training sessions may involve more slips as animals learn the task, and safety measures prevent injury.
Maintain consistent inter-trial intervals of 2-3 minutes to prevent fatigue effects while preserving task motivation.
Why: Optimal spacing prevents performance degradation while maintaining the animals' engagement with the tactile discrimination challenge.
Setup Guide
What’s in the Box
- Incline ladder frame with 45-degree support structure
- 9 adjustable rungs with dual-surface design
- Landing platform assembly
- Assembly hardware and tools
- Protocol manual with training procedures
- Data recording sheets (typical)
Warranty
ConductScience provides a standard 1-year manufacturer warranty covering defects in materials and workmanship, with technical support for protocol optimization and troubleshooting.
Compliance
What training duration is required before baseline testing?
Animals require daily training for 2 weeks to establish stable baseline performance before experimental manipulation, with 3 trials per day throughout the protocol.
How does this test differ from standard ladder walking tasks?
The dual-surface rung design specifically challenges tactile discrimination by requiring animals to distinguish between stable textured and unstable smooth surfaces, making it more sensitive to dorsal column pathway deficits.
What parameters should be measured during testing?
Key metrics include completion time, number of foot slips, foot placement accuracy, and preference for textured versus smooth surfaces, typically analyzed via video recording.
Can rung spacing be adjusted for different experimental needs?
Yes, the 9 rungs are adjustable to accommodate different task difficulties, species requirements, or specific experimental paradigms.
What types of lesions is this test most sensitive to detecting?
The test is particularly sensitive to dorsal column lesions affecting tactile and proprioceptive pathways, as originally validated by Fagoe et al. for detecting functional deficits in these systems.
How long can longitudinal studies be conducted?
The protocol is designed for weekly testing over 8-12 weeks, allowing assessment of both acute deficits and long-term recovery patterns.
What environmental factors should be controlled during testing?
Maintain consistent lighting, minimize environmental noise, and ensure stable apparatus positioning to reduce variability in tactile discrimination performance.
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