ECoG Brain Mapping Without Subject Participation
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Solution Overview
Problem
Current brain mapping techniques, such as electrical cortical stimulation, are limited by the need for subject responsiveness and pose risks like seizure induction, making it difficult to map language and motor functions, especially in anesthetized or unresponsive subjects.
Innovation Solution
The use of electrocorticography (ECoG) with recording electrodes placed on the brain surface allows for real-time mapping of brain activity without electrical stimulation, enabling passive mapping of language and motor functions in subjects who do not need to actively participate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical cortical stimulation is used for brain mapping, then functional areas can be identified through behavioral responses, but subject responsiveness is required and seizure risks increase
Solution Approach 1:
The patent replaces electrical cortical stimulation with electrocorticography recording. Instead of applying electrical stimuli and observing behavioral responses, the system uses ECoG electrodes to record spontaneous or stimulus-evoked neural activity patterns. This substitution eliminates the need for subject responsiveness and behavioral assessment while directly measuring neural activity in functional areas.
Solution Approach 2:
The patent introduces auditory stimuli as an intermediary to evoke neural responses. By presenting structured auditory inputs (e.g., speech sounds, tones) and recording the resulting ECoG responses, the system indirectly identifies language and auditory processing areas without requiring subject participation or behavioral responses. The auditory stimuli serve as a mediator between the recording system and the functional areas of interest.
2Measurement precision
If electrical cortical stimulation is applied to map brain functions, then functional regions can be localized, but seizure induction risk increases
Solution Approach 1:
The patent replaces the harmful electrical stimulation mechanism with a safe recording mechanism. ECoG electrodes passively record neural activity without delivering electrical pulses that could trigger seizures. This fundamental mechanism change eliminates the seizure risk while maintaining the ability to localize functional brain regions through analysis of recorded activity patterns and their spatial distribution.
Solution Approach 2:
The patent converts the potential harm of electrical stimulation into a benefit by using very low-level electrical recording that cannot induce seizures. The ECoG technique uses electrical fields so weak they are essentially non-invasive, transforming the potentially harmful electrical interaction into a safe monitoring tool that provides functional mapping information without risk of adverse effects.
3Measurement precision
If conventional brain mapping methods are used, then functional areas can be identified, but extensive data collection and analysis time is required
Solution Approach 1:
The patent performs preliminary action by placing multiple ECoG electrodes across the cortical surface before functional mapping begins. This electrode array is positioned during surgery to cover relevant brain regions, allowing immediate recording of neural activity without requiring subsequent extensive data collection. The preliminary electrode placement enables real-time functional mapping as surgery progresses.
Solution Approach 2:
The patent implements continuous useful action by recording ECoG signals continuously during the surgical procedure. Rather than collecting data in discrete batches requiring lengthy analysis intervals, the system continuously monitors neural activity, providing ongoing functional mapping information that guides surgical decisions in real-time without interruption or delay.
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
ECoG-based brain mapping provides accurate and rapid identification of brain regions responsible for language and motor functions, even in anesthetized subjects, facilitating safer surgical procedures by avoiding critical functional areas.
Implementation Method 1
The use of electrocorticography (ECoG) with recording electrodes placed on the brain surface allows for real-time mapping of brain activity
Data Source
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AI summary
Provided is a method for mapping a neural area involved in speech processing, including applying a plurality of recording electrodes to a surface of a cortex of a human subject, presenting a plurality of auditory stimuli to the subject wherein some of the plurality of stimuli are speech sounds and others of the plurality of auditory stimuli are non-speech sounds, recording brain activity during the presenting of the plurality of auditory stimuli, and identifying one or more brain areas wherein activity changes more after presentation of speech sounds than it does after presentation of non-speech sounds, wherein the human subject does not speak during the presenting and the recording. Also provided is a method for mapping a neural area involved in speech production wherein the human subject does not speak during presenting speech stimuli and recording neural activity.