Method for determining mental fatigue degree

FIELD: medicine.

SUBSTANCE: method involves forming signals as tests requiring solution. The tests are shown with frequency changed proportionally to the frequency they are solved. The number of tests is set to be the same in the cases of recovered and tired state. General amount of time spent for finding solution for given number of tests and the number of tests having right solutions are determined in each state. Mental fatigue degree is evaluated from relative change of mean time needed for finding the right test solution using a relationship like (Tm.r- Tm.t)100%/Tm.t, where Tm.t = Tsum.t/Kr.t, Tm.r = Tsum.r/Kr.r, Tm.t is the time spent for finding the right answer in tired state, Tm.r is the time spent for finding the right answer in recovery state, Tsum.t is the total time spent to solve given number of tests in tired state, Tsum.r is the total time spent to solve given number of tests in recovered state, Kr.t is the number of right answers to the tests in tired state, Kr.r is the number of right answers to the tests in recovered state.

EFFECT: reliable estimation of fatigue degree.

 

The invention relates to medicine, in particular to techniques for the measurement of psychophysiological characteristics, and relates to a method of determining the degree of mental fatigue. In practice, the functional activity of workers of different specialties significant proportion of working time is hard mental work. This applies to researchers, teachers, researchers, operators and other Onset of mental fatigue comes slowly. There are errors, reduce work efficiency. Their appearance is especially dangerous in the operator's labor, where the result can be accidents, disasters and other disaster-related deaths. Therefore, timely detection of the onset of mental fatigue with the purpose of taking the necessary measures to prevent errors and contributes to the effectiveness of the work of specialists, and in some cases can prevent the occurrence of emergency situations and reduce the risk to life.

There is a method of determining the degree of mental (visual) fatigue, providing for the presentation of the subject signals with continuously variable frequency (see, for example, Derevianko, VA and other Integrated health evaluation mental and physical labor, M, 1976, p.76). In this way the subject as the signal makes the I stream flashing light.

This method has drawbacks: low accuracy due to limitations of the assessment only visual apparatus, in which the mental component is only a part, a large scatter of data and a large number of measurements to assess the degree of visual (mental) fatigue. In addition, using this method associated with difficulties when comparing data obtained by different researchers for different subjects. These shortcomings stem largely from the fact that in the process of testing is used only visual apparatus in limited conditions in the presence of light interference, and also because of the small magnitude of the shift of the absolute values of the critical frequency of flicker fusion, depending on the state change of the operator. However, it is known (see, for example, Aviso. The eye and the light. HP: Energoatomizdat, 1983, s.89-90)that the critical frequency of flicker fusion depends on many factors, in particular: frequency of flicker, brightness, luminous flux, the angular size of the field of view, depth of modulation brightness flickering (amplitude modulation), etc. in Addition, the light sensitivity of the retina depending on the distance from the center of the eye is significantly different (see ibid., pp.37-53), and its working area is usually limited, especially in subjects in nature about the ' professional activity which is associated with the operator's labor, for example the operator of a military-technical complexes, aviators and others Therefore, the reliability estimates for absolute values in a single test is not high.

There is a method of determining the state of the operator, providing for the presentation of the subject (submission in his field of vision) signals in the form of a stream of flashing light variable frequency and simultaneously smooth flow of light, the defining moment when the light will seem to the subject are equally illuminated (see, for example, USSR author's certificate No. 339280). This method, in some cases, allows you to make measurements more accurate, because it provides the opportunity to focus on a standard (smooth) flow of light and use more of the visual apparatus. However, the location in the field of view of the test simultaneously two sources with different characteristics, constant comparison and tracking them dissipate the attention of the subject and not give in fully to ensure the accuracy and reliability of the assessment. The brightness of the second source (with smooth flow of light) is summed with the brightness of the first and causes additional error (see ibid., p.85-87, 117-121). In addition, diagnostics limited, as in the previous method, the evaluation of the condition (fatigue) mostly visual apparatus the test.

Known is a procedure to determine the degree of mental fatigue, consisting in the presentation of the subject signals of variable frequency in the form of a stream of flashing light and measuring the rate of reaction of the test on the presented signals by measuring the critical frequency of flicker fusion, subjects perceived (see, for example, USSR author's certificate No. 673266, class. And 61 5/16, 1977). According to this method, additionally measured critical frequency of flicker fusion perceived by the other eye, and the difference between the obtained values determine the degree of fatigue. This method unlike the previous provides a higher degree of definition of the state (fatigue) is not only visual apparatus, but also the whole person, particularly his mental apparatus, as in the formation of visual images participates not only one eye directly, but the second eye, and a large part of the brain (see, for example, Aviso. The eye and the light. HP: Energoatomizdat, 1983, p.52-53). However, this approximation to reality is not enough, because the field of vision of one eye is large enough, for example, in the horizontal plane it is about 150° (see ibid., p.53-55), and the working area of the field of view, usually much less. This particularly applies to those professional employees whose work is connected with optical instruments, and primarily with monocular devices (microscopes is, telescopes, different kind of sight, sighting devices and others). In these cases, the primary workload perceives the Central part of the retina, the angular size of which is measured in degrees. Given the angular size of the overwhelming majority of typical objects in space objects, which contacts the visual apparatus of the eye through an optical device, and the probability of their deviation from the optic axis, it is possible to determine the angular size of the most loaded part of the retina, which does not exceed 3°. Therefore, the application in these cases the method according to A.S. No. 673266 yields the result in determining the condition of the optic apparatus for participating in the trial as “tired”and “not tired” parts of the retina. In addition, the reliability of the estimate is affected in this case and the optical component of the optic apparatus, and the part of the brain that is involved in the activity of the visual system (see ibid., p.7-11, 66-71). Reliability of diagnosing the state of the operator in relation to mental activity at the time of testing visual apparatus is not high, it is only part of the mental activity of the brain.

Known also adopted in this application as a prototype method to determine the degree of mental fatigue, zakluchalos is in the presentation of the subject signal of a variable frequency in a relaxed and tired state, the measurement of the rate of reaction of the test presented on the signal and determining the extent of mental (visual) fatigue relative deviation values of the measured parameter. In this case, as the required signal is also used flow flashing light with variable frequency, and as one of the indicators is a critical frequency of flicker fusion. However, a final assessment is made according to the relative deviation indicator, measured in the initial (relaxed) condition and in a state of fatigue, which increases the reliability of the estimate. In addition, with the same purpose visual apparatus the test screen from extraneous light sources, a light beam is directed to the Central part. The procedure in this way also allows you to decrease the load on the visual system of the test.

However, in this method, the accuracy of the determination of mental fatigue largely depends on the characteristics of the visual system and the risk of injury it is not ruled out completely.

The aim of the invention is to increase the reliability of determination of mental fatigue tested by increasing mental and reduce the visual components of his load.

This objective is achieved in that in the method of determining the mental is military fatigue, consisting in the presentation of the subject signals of a variable frequency in a relaxed and tired state, measuring the reaction of the test presented on the signals and the assessment of the degree of fatigue on the relative deviation of the measured values of the indicators presented signals form as requiring resolution tests. the frequency of presentation which change is proportional to the frequency of their solutions, the number of tests for the rested and fatigued States asked the same set, defined in each of the States, the total time for solving a given number of tests and the number of correctly solved test, and evaluation of mental fatigue produced by the relative change of the average time the right decisions in accordance with the expression (TSRU-Tsro)100%/TSRU where TSRU=Tsumu/Kpro, Tsro=Tsumo/Kpro, Dru - the average time a correct solution of a single test in a tired state, Tsro - the average time a correct solution of a single test in a relaxed condition, Tsumo - the total solution time a specified number of tests in a tired state, Tsumo - the total solution time given the number of tests in relaxed condition, Kbru - the number of correctly solved test in a tired state, Cpro - the number of correctly solved test in a relaxed state.

Applying pre the proposed method of determining the degree of mental fatigue can improve the accuracy of the method by increasing mental and reduce the visual stress test.

To study the degree of mental fatigue have tested the signals of a variable frequency in a relaxed and tired state. The signals formed in the form of tests to be solved, i.e. it represents the mental load. It is advisable that this mental load was close to the professional activity of the test. Tests can be drawn from the typical tasks typical of professional activity of the test, which ensures the stability of the results and statistical reliability, as the testing process practically does not change the level of mastery of the subject, and also saves time because it eliminates the need for preliminary preparation of the test. To provide versatility in the tests can be used in common, accessible to a wide audience of logical, mathematical, technical, and other expressions that do not require deep or special knowledge. For example, each test may contain some mathematical expression that requires execution of the specified action. In the simplest case it can be two or more digits that must be added. Tests on the complexity and structure must be of the same type, similar to each other (to ensure consistency), and the numbers be set randomly (to ensure N. the dependence and subsequent comparability of test results and subjects). The frequency of presentation of tests (signals) varies and depends on the speed of test execution. Each subsequent test the subject is presented only after the solution of the previous test (in the case of mathematical expressions). Math tests it is advisable to bring (head) screen visual display units. Their solution, if you want to record, also posted (test) on the screen next to a mathematical expression. When submitting tests, you must ensure that the process of filing would not affect the process of their implementation (solution)so that the solution does not slow down due to the premature appearance or absence of the mathematical expression on the screen, that in both cases, causes RF interference to the test.

Order of convergence of test conditions in a relaxed and tired state the number of tests and in the first and second cases take the same and is carried out in several series. Studies show that it is appropriate to 3-5 series of 10 tests in each of them. To maximize load balancing for all series and States, simplify testing and ensure invariance with respect to the professional characteristics of the subjects in each test, a mathematical expression consists of a two-digit integer random numbers, as is the behaviour used the summation and subtraction. The numbers are selected and arranged so that the result was also a two-digit number. Then define the total solution time given the number of tests in a jaded state Tsumu and in relaxed condition Tsumo, as well as the number of correctly solved test in a jaded state Kpro and in relaxed condition Kpro Next, determine the average time the right decisions in every state. In a jaded: Tsro=Tsumu/Kpro and rested: Tsro=Tsumo/Kpro the Assessment of the degree of mental fatigue ΔWu produced by the relative change of the average time the right decisions in the interest in accordance with the expression Δuu=(TSRU-Tsro)100%/Tsra. The proposed method compared to known more critical to mental stress because of the evaluation is practically eliminated component of the optic apparatus. Its implementation from a technical point of view is straightforward. Enough to have a dedicated viewing device and the sensor time. In the simplest case, we can restrict his blackboard, chalk and a stopwatch. If you have a computer possible way significantly expanded.

Thus, the proposed method allows for more accurate (more than 15%) and to reliably assess the degree of mental fatigue of the subjects and to predict the changes in their profession the national indicators, especially if the main activity of the subjects is mental work. Moreover, the procedure in this way provides a more gentle to the visual system. Early and more accurate determination of the degree of mental fatigue and ultimately helps a timely manner to prevent undesirable actions of the subjects, their errors caused by mental fatigue, as well as to avoid injury to the optic apparatus, to maintain its performance and longevity.

The method of determining the degree of mental fatigue, which consists in the presentation of the test signals of a variable frequency in a relaxed and tired state, measuring the response of the subject to the presented signals and the assessment of the degree of fatigue on the relative deviation of the measured parameters, wherein the signal form as requiring resolution tests, the frequency of presentation which change is proportional to the frequency of their solutions, the number of tests for the rested and fatigued States asked the same set, defined in each of the States, the total time for solving a given number of tests and the number of correctly solved test, and evaluation of mental fatigue produced by the relative change of the average time the right decision in accordance with expression is the group (TSRU-Tsro)100%/TSRU, where TSRU=Tsumu/Kpro, Tsro=Tsumo/Kpro, Dru - the average time a correct solution of a single test in a tired state, Tsro - the average time a correct solution of a single test in a relaxed state, Tamu - the total solution time a specified number of tests in a tired state, Tsumo - the total solution time given the number of tests in relaxed condition, Kbru - the number of correctly solved test in a tired state, Cpro - the number of correctly solved test in a relaxed state.



 

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FIELD: medicine.

SUBSTANCE: method involves forming signals as tests requiring solution. The tests are shown with frequency changed proportionally to the frequency they are solved. The number of tests is set to be the same in the cases of recovered and tired state. General amount of time spent for finding solution for given number of tests and the number of tests having right solutions are determined in each state. Mental fatigue degree is evaluated from relative change of mean time needed for finding the right test solution using a relationship like (Tm.r- Tm.t)100%/Tm.t, where Tm.t = Tsum.t/Kr.t, Tm.r = Tsum.r/Kr.r, Tm.t is the time spent for finding the right answer in tired state, Tm.r is the time spent for finding the right answer in recovery state, Tsum.t is the total time spent to solve given number of tests in tired state, Tsum.r is the total time spent to solve given number of tests in recovered state, Kr.t is the number of right answers to the tests in tired state, Kr.r is the number of right answers to the tests in recovered state.

EFFECT: reliable estimation of fatigue degree.

FIELD: medicine.

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FIELD: medicine, neurology.

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1 ex, 1 tbl

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EFFECT: higher quality of diagnostics.

4 ex

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5 cl, 4 dwg, 2 ex, 17 tbl

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