Digitized DSST Display Partitioning for Cognitive Load Entropy
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Solution Overview
Problem
Conventional Digit Symbol Substitution Test (DSST) methods lack sensitivity to changes in response time, attention, working memory, and visuo-motor coordination, primarily focusing on correct matches within a time limit without considering gradual changes or the distribution of cognitive load.
Innovation Solution
A digitized DSST system that partitions the display area into multiple bins based on distance and degree from the center, displaying number-symbol pairs as a lookup table and computing feature values such as response time and accuracy, determining probabilities, and calculating entropy values to assess the distribution of cognitive load and visuo-spatial neglect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional DSST methods are used, then the test is simple to administer, but the test lacks sensitivity to changes in response time, attention, working memory, and visuo-motor coordination
Solution Approach 1:
The patent segments the display area into multiple bins based on distance and degree from center position, allowing separate analysis of response times and accuracy in different spatial regions. This segmentation enables sensitive detection of visuo-spatial neglect and attention deficits without requiring complex additional equipment.
Solution Approach 2:
The patent adds spatial dimensionality to the traditional DSST by analyzing response patterns across different bins (distance and degree from center). This dimensional expansion transforms a simple score-based test into a multi-parameter assessment that detects subtle cognitive changes while maintaining the basic test structure.
2Loss of information
If the display area is partitioned into multiple bins and entropy values are computed, then comprehensive cognitive load distribution is assessed, but the computational complexity increases
Solution Approach 1:
The patent introduces entropy values as an intermediary metric that summarizes the distribution of response times and accuracy across multiple bins. This single computed value captures complex cognitive load distribution patterns without requiring direct analysis of all individual response parameters, reducing information loss while managing computational complexity.
3Measurement precision
If location of QA pairs is changed in multiple trials, then visuo-spatial neglect is detected, but the test administration becomes more complex
Solution Approach 1:
The patent makes the QA pair locations dynamic by changing their positions across multiple trials according to the bin distribution scheme. This dynamic arrangement automatically detects visuo-spatial neglect through pattern analysis of where errors occur, without requiring manual adjustment or complex procedural changes from the administrator.
Data Source
AI summary
System and method for digitized digit symbol substitution test (DSST) are disclosed. In an example, a display area of a digitized DSST device is partitioned into multiple bins. Further, a series of number symbol pairs is displayed as a lookup table on top of the display, termed as a lookup area. Furthermore, a question and answer (QA) pair corresponding to the series of number symbol pairs to an examinee in multiple trials. In addition, feature values for the QA pair are computed in each of the multiple bins in the trials, wherein the feature values comprise a response time and an accuracy of response by the examinee. Moreover, probabilities of the feature values are determined in each of the multiple bins. Also, an entropy value based on the probabilities of the feature values is computed in each of the multiple bins providing information on distribution.