Cognitive load and pressure measurement method and device based on peripheral vessel strain

A technology of peripheral vascular strain and cognitive load, applied in the field of information, can solve problems such as limitations, and achieve real-time measurement, obvious reliability, and obvious individual differences

Active Publication Date: 2016-08-17
TSINGHUA UNIV
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Problems solved by technology

However, these measurement methods have varying degrees of deficiencies in accuracy, r

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  • Cognitive load and pressure measurement method and device based on peripheral vessel strain
  • Cognitive load and pressure measurement method and device based on peripheral vessel strain
  • Cognitive load and pressure measurement method and device based on peripheral vessel strain

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[0038] The following describes the implementation of the present invention in detail with reference to the drawings and embodiments.

[0039] The sVRI-based cognitive load and stress measurement process of the present invention is as follows figure 1 As shown, first collect the PPG signal through the photoelectric sensor; secondly, perform digital filtering of the software layer to eliminate artificial noise and further improve the quality of the PPG signal; again based on the filtered data, perform sVRI feature extraction; and then through the dynamic active window and based on statistics The stabilization strategy finally obtains a stable and continuous sVRI output, which is used to evaluate the cognitive load and stress level of users.

[0040] The sVRI output of the present invention is obtained by processing the traditional PPG signal. figure 2 The basic flow of sVRI physiological signal acquisition and processing used in the present invention is given. The signal input of sVR...

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Abstract

The invention provides a cognitive load and pressure measurement method based on peripheral vessel strain. The cognitive load and pressure measurement method comprises the following steps: collecting PPG (photo-plethysmography) signals by adopting a transmission-type or reflection-type photoelectric sensor, and carrying out filtering to eliminate noises; carrying out instantaneous peripheral vessel strain feature extraction; carrying out dynamic sliding window arrangement and data modulation based on the statistics to obtain the continuous and stable sVRI output; and finally, evaluating the cognitive load and the pressure level by adopting sVRI. The invention further provides a corresponding measurement device. Different from the traditional measure methods based on the peripheral vessel expansion degree, in the measurement method provided by the invention, the sVRI adopts the ratio of the amplitudes of the adjacent wave bands of the PPG signals, and the experiment finds that the indication is relatively sensitive and reliable in reflecting the cognitive load and the pressure; the cognitive load and pressure measurement technology based on the peripheral vessel strain has the obvious advantages in the aspects of sensitivity, reliability and individual differences when used for measuring the psychological activities including the cognitive load and the psychological pressure of people, can carry out real-time measurement, and can be well applied to the pervasive environment.

Description

technical field [0001] The invention belongs to the field of information technology, in particular to a method and device for measuring cognitive load and pressure based on peripheral blood vessel strain. Background technique [0002] Cognitive load is the load on the cognitive system—working memory—that learners feel when processing information. Mental engagement refers to the cognitive capacity assigned to tasks by learners, which reflects the actual level of cognitive load and can be used as a measure of cognitive load. When cognitive load or mental engagement exceeds a learner's cognitive capacity, stress occurs and hinders learning to handle the task. Therefore, cognitive load will affect learners' behavior strategies and performance results, and can lead to changes in learners' physiological and psychological processes. It is therefore of great value to measure cognitive load and stress. [0003] Currently commonly used methods of measuring cognitive load and stress...

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Application Information

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IPC IPC(8): A61B5/16A61B5/00
CPCA61B5/16A61B5/6826
Inventor 吕勇强罗晓民史元春郝玉恒
Owner TSINGHUA UNIV
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