A method and device for measuring cognitive load and stress based on peripheral vascular strain

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...

AI Technical Summary

Problems solved by technology

However, these measurement methods have varying degrees of deficiencies in accuracy, reliability, and usability, and are greatly limited in actual application environments.

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