Sensorimotor Assessment Apparatus for Rapid Motor Correction Analysis
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Solution Overview
Problem
Current clinical assessment methods lack objective and precise measures to evaluate a subject's ability to generate rapid motor corrections, which are crucial for diagnosing neurological disorders and assessing motor skills, especially given the complexity and speed of these corrections in healthy individuals and patients with impairments.
Innovation Solution
A method and apparatus that restrict limb movement within a workspace, present an object moving towards the subject, and obtain position, motion, and kinetic data during interactions, including perturbations, to construct a dataset for analyzing sensorimotor performance, allowing for the assessment of rapid motor corrections and brain function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional visual inspection methods are used to assess motor corrections, then the assessment can be performed without specialized equipment, but the measurement precision is insufficient to detect subtle changes in performance occurring in under 200 ms
Solution Approach 1:
The patent replaces manual visual inspection with automated computer-based tracking systems that use optical sensors and software algorithms to precisely measure limb position, velocity, and acceleration. This substitution enables objective quantification of motor corrections with millisecond temporal resolution and sub-millimeter spatial precision, far exceeding human visual capabilities while maintaining clinical accessibility through standardized software platforms
Solution Approach 2:
The patent introduces an intermediary computational system that acts as a bridge between the subject's motor actions and the clinician's assessment. The system includes tracking software that processes raw sensor data, applies motion analysis algorithms, and generates standardized performance metrics. This intermediary layer transforms complex biomechanical data into clinically interpretable measures of motor correction speed and accuracy
2Ease of operation
If reaction time tasks are used to assess sensory information processing, then the assessment is easy to administer, but the tasks do not assess how sensory information is used to guide ongoing motor actions
Solution Approach 1:
The patent transitions from static button-press reaction time tasks to dynamic continuous motor tasks where subjects perform natural limb movements while being subjected to mechanical perturbations. The system dynamically adjusts perturbation timing and magnitude based on real-time movement detection, enabling assessment of sensorimotor processing during actual motor execution rather than during static preparatory states
Solution Approach 2:
The patent implements closed-loop feedback by applying mechanical perturbations to the subject's limb during ongoing motor actions and measuring the corrective responses. The system provides real-time force feedback through the mechanical apparatus and visual feedback through computer displays, enabling precise measurement of how sensory information guides motor corrections while maintaining ecological validity of natural movement patterns
3Measurement precision
If reaching trials are performed without disturbances to ensure subjects do not anticipate visual or mechanical disturbances, then the baseline performance can be measured, but the time to complete enough trials to quantify performance reliably increases substantially
Solution Approach 1:
The patent employs periodic alternation between unperturbed baseline trials and perturbed trial blocks, with each block containing a predetermined number of trials. This structured periodic design allows efficient data collection by grouping similar trial types together, enabling reliable baseline characterization in fewer trials while systematically incorporating perturbation conditions for comprehensive sensorimotor assessment
Solution Approach 2:
The patent performs preliminary characterization of each subject's baseline reaching performance during an initial block of unperturbed trials before introducing mechanical or visual disturbances. This preliminary action establishes subject-specific reference values for movement speed, accuracy, and trajectory that are then used to normalize and interpret subsequent perturbed trial data, reducing the total number of trials needed for reliable quantification
Data Source
AI summary
A method and apparatus for quantifying differences in human sensorimotor performance useful for diagnosing, assessing, and/or detecting brain injury and/or a neurological disorder, or identifying exceptional performance in a subject. In a task a subject's limb movement is restricted to a limited workspace and an object moves towards the limb. The objective of the task is for the subject to contact the object with the limb within a set time period. During the task a perturbation directed to the object and/or limb, or other feature of the environment, may occur on some trials, requiring a rapid motor correction in order to contact the object, or the subject may receive an alternative instruction on whether to interact with the object. Position data and/or motion data and/or kinetic data of the limb or portions thereof with respect to a presented object are obtained, and a data set is acquired for a plurality of trials. The acquired data set provides information about brain injury and/or a neurological disorder in the subject or exceptional capabilities of the subject.