Acoustic Startle Response Diagnostic System for PTSD
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Solution Overview
Problem
Current diagnostic methods for PTSD are limited by the subjectivity of questionnaires, the high cost and limited availability of neuroimaging techniques, and the variability of heart rate variability measurements, necessitating a more objective, accurate, and inexpensive biological marker for diagnosis.
Innovation Solution
A diagnostic system that measures the acoustic startle reflex, including eyeblink response, post-auricular muscle response, intrinsic auricular muscle response, and prepulse inhibition, using earphones for auditory stimuli and electrodes to record muscle responses, along with a display for prepulse stimuli, to provide a comprehensive and cost-effective method for diagnosing PTSD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If questionnaires are used to diagnose PTSD, then the diagnostic process is simple and inexpensive, but the results are highly subjective and unreliable
Solution Approach 1:
The patent replaces the mechanical/questionnaire-based diagnostic system with a physiological measurement system. Instead of using subjective self-report questionnaires, the system objectively measures the acoustic startle response through electromyography (EMG) of the orbicularis oculi muscle, substituting subjective reporting with objective physiological data collection and analysis
2Reliability
If neuroimaging methods are used to diagnose PTSD, then the diagnostic accuracy is high, but the cost is very expensive and availability is limited
Solution Approach 1:
The patent employs inexpensive, portable acoustic startle response measurement equipment instead of expensive neuroimaging devices like fMRI or MEG. The system uses affordable EMG sensors, audio output devices, and standard computing hardware to perform multiple diagnostic measurements, providing a cost-effective alternative that maintains diagnostic accuracy while being widely accessible
Solution Approach 2:
The patent captures and analyzes physiological responses (electromyographic signals from muscle contractions) as objective copies of the subject's internal state. These physiological copies serve as diagnostic indicators, replacing the need for direct observation of brain activity through expensive neuroimaging while maintaining diagnostic validity
3Ease of operation
If heart rate variability is used to diagnose PTSD, then the measurement is simple, but the effectiveness is limited and results are controversial
Solution Approach 1:
The patent changes the physiological parameter being measured from heart rate variability to acoustic startle response magnitude. Instead of analyzing temporal variations in heart intervals, the system measures the amplitude of muscle contractions in response to acoustic stimuli, providing a more precise and less controversial metric for PTSD diagnosis while maintaining operational simplicity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system offers a practical, accurate, and inexpensive method for diagnosing PTSD by quantifying the startle reflex responses, providing objective data that correlates with PTSD severity, overcoming the limitations of existing methods.
Implementation Method 1
The startle response is a response to abrupt and intense stimulation, consisting of a rapid sequential muscle contraction with the likely purpose of facilitating the flight reaction and/or to protect the body from sudden attack. Acoustic startle is evoked by short (50 ms) noises, usually broadband or white noise with a high intensity (90-110 dB).
Implementation Method 2
Electrical activity associated with contraction of the orbicularis oculi muscle can be detected with an EMG using two electrodes below one eye
Data Source
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AI summary
The present invention relates to a diagnostic system (100) for measuring and analyzing startle response of a subject (10) wherein said diagnostic system (100) comprises a stimuli delivery module (110), whereby startle stimuli (120) and prepulse stimuli (121) are delivered to subject (10); said diagnostic system (100) comprises at least one sensor module (111), whereby the startle response of subject (10) are detected and recorded; said sensor module (111) comprises at least one electrode and one eye blink response measuring means; and said diagnostic system (100) comprises a diagnosis module (112) whereby the features of the startle response (130, 131, 132) and prepulse inhibition of subject (10) are extracted and analyzed.