Cognitive Test Battery Using Timed-Untimed Score Disparity
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Solution Overview
Problem
Standard neuropsychological assessments fail to detect subtle cognitive impairments in patients with conditions like mild traumatic brain injury or multiple sclerosis, as they are not sensitive enough, leading to misclassification of these patients as healthy despite significant everyday difficulties.
Innovation Solution
Administer a battery of cognitive tests that include both time-constrained and non-time-constrained tasks, generating composite scores for each, and computing a characteristic value based on these scores to detect subtle cognitive impairment by identifying disparities between the two types of tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard neuropsychological assessment tests are used, then the assessment is simple and quick to administer, but the detection sensitivity for subtle cognitive impairment is insufficient
Solution Approach 1:
The test battery is segmented into multiple categories: timed tests, untimed tests, and tests with varying cognitive demand constraints. This segmentation allows for comprehensive assessment by comparing performance across different test conditions, thereby improving detection sensitivity for subtle cognitive impairment while maintaining manageable test administration through structured categorization.
Solution Approach 2:
The patent applies parameter changes by varying cognitive demand constraints across different test administrations. Specifically, the same or similar cognitive tasks are administered under different conditions (with time constraints, without time constraints, with varying stimulus visibility, etc.). This allows detection of subtle impairments by measuring performance differences across parameter variations, thereby improving measurement precision without requiring entirely new test instruments.
2Measurement precision
If time-constrained tests are administered, then additional cognitive demand is imposed to reveal subtle impairment, but test difficulty and patient burden increase
Solution Approach 1:
The patent applies local quality by selectively imposing cognitive demand constraints on specific test subsets rather than uniformly across all tests. Timed tests are administered to certain cognitive domains while untimed versions are provided for others, allowing targeted assessment of subtle impairment without unnecessarily burdening the patient across the entire test battery. This localized application of constraints optimizes both detection accuracy and patient ease of operation.
Solution Approach 2:
The patent employs partial action by administering time-constrained tests only to the extent necessary for detection. The system evaluates performance on timed tests and compares it with untimed test performance, using this partial imposition of time constraints to reveal subtle impairment. The cognitive demand constraint is applied selectively rather than excessively, achieving detection accuracy while minimizing unnecessary patient burden.
Data Source
AI summary
A means for distinguishing subjects with subtle cognitive impairment in the context of a neuropsychological assessment which comprises a battery of cognitive tests. A first set of tests is administered which have a time-constraint or other cognitive demand parameter imposed. A second set of tests is administered for which the time constraint or other cognitive demand parameter is not imposed. Based on comparing or relating the scores between the two sets of tests, subtle cognitive impairment can be detected, based on a criterion that subjects with subtle cognitive impairment present with a greater disparity in these two sets of scores than do normal subjects.