Method and system for assessment of cognitive workload using breathing pattern of a person

Patent metadata

Field	Value
Publication number	US-11523761-B2
Application number	US-202016889871-A
Country	US
Kind code	B2
Filing date	Jun 2, 2020
Priority date	Jun 6, 2019
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

This disclosure relates generally to assessment of cognitive workload using breathing pattern of a person, where cognitive workload is the amount of mental effort required while doing a task. The method and system provides assessment of cognitive workload based on breathing pattern extracted from photoplethysmograph (PPG) signal, which is collected from the person using a wearable device. The PPG signal collected using the wearable device are processed in multiple stages that include breathing signal extraction to extract breathing pattern. The extracted breathing pattern is used for assessment of cognitive workload using a generated personalized training model, wherein the personalized training model is generated and dynamically updated for each person based on selection of a sub-set of breathing pattern features using feature selection and classification techniques that include maximal information coefficient (MIC) techniques. Finally based on personalized training model, the extracted breathing pattern is classified as high cognitive workload or low cognitive workload.

First claim

We claim:

1. A processor-implemented method for assessment of cognitive workload based on breathing pattern of a person, the method comprising:
sensing a plurality of physiological data from the person using a plurality of physiological sensors while the person is performing a pre-assigned activity;
extracting a plurality of breathing signals from the received plurality of physiological data;
extracting a plurality of breathing pattern features from the extracted plurality of breathing signals;
selecting a subset of breathing pattern features from the extracted plurality of breathing pattern features;
generating a personalized training model and a dynamic classifier for the person based on the selected subset of breathing pattern features;
sensing actual plurality of physiological data using the plurality of physiological sensors while the person is performing the pre-assigned activity;
extracting plurality of actual breathing signals from the received actual plurality of physiological data;
extracting plurality of actual breathing pattern features from the extracted actual plurality of breathing signals;
classifying the actual breathing pattern features of the person into high cognitive workload or low cognitive workload using the personalized training model; and
displaying the classified actual breathing pattern features.

2. The method of claim 1 , wherein the personalized training model and dynamic classifier is dynamically updated based on comparison of classified actual subset of breathing pattern features and an exhaustive list of tasks and their respective cognitive workload.

3. The method of claim 1 , wherein the plurality of physiological sensors present on a non-intrusive wearable device attached to the person.

4. The method of claim 1 , wherein the person performs the pre-assigned activity assigned by a task database, wherein the task database comprises of an exhaustive list of tasks and their respective cognitive workload.

5. The method of claim 1 , wherein the plurality of physiological sensor data includes photoplethysmogram (PPG) signals.

6. The method of claim 1 , wherein plurality of breathing signals are extracted or reconstructed based on normalization techniques using filters that include 4 th order Chebyshev IIR filter.

7. The method of claim 1 , wherein the step of extracting the plurality of breathing pattern features include extracting standard respiratory features (R f ) and descriptive statistics (S f ) along with their subset features.

8. The method of claim 1 , wherein selection of the subset of breathing pattern features is based on feature selection and classification techniques that include maximal information coefficient (MIC) techniques.

9. The method of claim 1 , wherein the plurality of actual breathing signals are extracted/reconstructed based on normalization techniques using filters that include 4 th order Chebyshev IIR filter.

10. The method of claim 1 , wherein extracting plurality of actual breathing pattern features include actual extracting standard respiratory features (R fa ) and actual descriptive statistics (S fa ) along with their subset features.

11. A system comprising:
a cognitive workload assessment unit for mining rule intents from documents;
a memory for storing instructions;
one or more communication interfaces;
one or more hardware processors communicatively coupled to the memory using the one or more communication interfaces, wherein the one or more hardware processors are configured by the instructions to execute the one or more modules of the cognitive workload assessment unit for assessment of cognitive workload based on breathing pattern of a person, the system comprising:
a plurality of physiological sensors for sensing a plurality of physiological data and an actual plurality of physiological data from the person using while the person is performing a pre-assigned activity;
a breathing signal extractor in a extractor for extracting a plurality of breathing signals from the received plurality of physiological data and for extracting plurality of actual breathing signals from the received actual plurality of physiological data;
a breathing pattern extractor in the extractor for extracting a plurality of breathing pattern features from the extracted plurality of breathing signals and for extracting plurality of actual breathing pattern features from the extracted actual plurality of breathing signals;
a feature selector for selecting a subset of breathing pattern features from the extracted plurality of breathing pattern features;
a personalized training model generator for generating a personalized training model for the person based on the selected subset of breathing pattern features;
a dynamic classifier for classifying the actual breathing pattern features of the person into high cognitive workload or low cognitive workload using the personalized training model; and
a display module displaying the classified actual breathing pattern features.

12. The system of claim 11 , wherein a task database pre-assigns activity to be performed by a person and the task database comprises of an exhaustive list of tasks and their respective cognitive workload.

13. A non-transitory computer-readable medium having embodied thereon a computer readable program for estimation of remaining useful life in lithium based battery wherein the computer readable program, when executed by one or more hardware processors, cause:
sensing a plurality of physiological data from the person using a plurality of physiological sensors while the person is performing a pre-assigned activity;
extracting a plurality of breathing signals from the received plurality of physiological data;
extracting a plurality of breathing pattern features from the extracted plurality of breathing signals;
selecting a subset of breathing pattern features from the extracted plurality of breathing pattern features;
generating a personalized training model and a dynamic classifier for the person based on the selected subset of breathing pattern features;
sensing actual plurality of physiological data using the plurality of physiological sensors while the person is performing the pre-assigned activity;
extracting plurality of actual breathing signals from the received actual plurality of physiological data;
extracting plurality of actual breathing pattern features from the extracted actual plurality of breathing signals;
classifying the actual breathing pattern features of the person into high cognitive workload or low cognitive workload using the personalized training model; and
displaying the classified actual breathing pattern features.

Assignees

• Tata Consultancy Services Ltd

Inventors

• Jaiswal Dibyanshu
• Chatterjee Debatri
• Chowdhury Arijit
• Gavas Rahul
• Banerjee Tanushree

Classifications

• A61B5/0816 Primary

  Measuring devices for examining respiratory frequency (measuring frequency of electric signals G01R23/00) · CPC title

• A61B5/725

  using specific filters therefor, e.g. Kalman or adaptive filters (specific diagnostics methods using using bioelectric or biomagnetic signals A61B5/316) · CPC title

• A61B5/165 Primary

  Evaluating the state of mind, e.g. depression, anxiety · CPC title

• A61B5/02416

  using photoplethysmograph signals, e.g. generated by infrared radiation (A61B5/14552 takes precedence) · CPC title

• A61B5/4088

  Diagnosing of monitoring cognitive diseases, e.g. Alzheimer, prion diseases or dementia · CPC title