Spatial Cognitive Assessment Apparatus for Lab Animals
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Solution Overview
Problem
Current cognitive bias assays for lab animals, such as spatial discrimination assays, often fail to translate effectively between species like rats and mice, and existing olfactory cue-based assays face challenges in reliability and odor contamination, particularly for mice with strong olfactory sensory capabilities.
Innovation Solution
A spatial discrimination assay apparatus and method that leverages mice's preference for burrowing and darkness, using a device with a base member and stimulus projection for aversive stimuli, allowing automated or semi-automated delivery of reinforcements and punishments to assess emotional affinity by introducing ambiguous stimuli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If spatial discrimination assays are designed for rats based on food instinct, then the assay can assess cognitive bias in rats, but the assay does not translate well to other species such as mice
Solution Approach 1:
The patent changes the fundamental parameters of the assay from food-based motivation to burrowing and darkness-based motivation. This involves modifying the reinforcement type (from food to shelter), the sensory modalities engaged (from olfactory/visual to tactile/visual), and the behavioral patterns assessed (from food-seeking to shelter-seeking). These parameter changes enable the assay to translate across species while maintaining reliability by aligning with mice's natural ethological preferences.
2Measurement precision
If olfactory cue-based assays are used for rodents, then the assay can assess emotional states, but odor contamination and reliability issues arise particularly for mice with strong olfactory sensory capabilities
Solution Approach 1:
The patent extracts the olfactory component from the assay paradigm and replaces it with visual and tactile cues. By removing the reliance on odor cues that cause contamination problems, the assay maintains its ability to assess emotional states through spatial discrimination and aversive stimulus responses without the harmful side effect of odor contamination that particularly affects mice with acute olfactory senses.
Solution Approach 2:
The patent substitutes the olfactory-based detection system with a visual-mechanical system. Instead of relying on mice's sense of smell to detect cues, the assay uses visual markers, light cues, and spatial configuration that mice can perceive through their dominant visual and tactile senses. This substitution eliminates odor contamination while preserving measurement precision.
3Productivity
If automated delivery of reinforcements and punishments is implemented, then handling between trials is minimized, but device complexity increases
Solution Approach 1:
The patent segments the automated apparatus into distinct functional modules: a burrow chamber for shelter provision, a stimulus delivery system for aversive events, a reinforcement delivery system for rewards, and a control system for coordinating operations. This modular segmentation manages device complexity by organizing functions into separatable units while maintaining automated high-throughput capability through integrated control.
Data Source
AI summary
The present disclosure relates to a method and apparatus for performing a cognitive bias assay on a lab animal. The apparatus may include a first base member and a second base member spaced apart from the first base member to form an interior region between the first and second base members. The second base member may include a plurality of spaced apertures providing access to the interior region. Each of the plurality of apertures may be sized to receive a lab animal. The second base member may be configured to support the lab animal. The apparatus may further include a stimulus device operative to project an aversive stimulus towards the second base member.