Investigating the effect of Noise on continuous performance in Terms of personality traits characteristics

Abstract

Introduction: Human exposure to noise in the workplace can lead to well-known effects and complications such as hearing loss and adverse physiological and psycho-psychological effects. It can also affect mental efficiency in addition to creating a feeling of discomfort. The mental effect of sound is not the same for all people, both in the work environment and in the community, and different people are not affected in the same way in terms of its psychological and nervous effects, so a sound may be tolerable for some people and annoying for others.Noise annoyance is another issue related to sound, which has nothing to do with people's health and is merely a measure to express the level of comfort.In this research, it was intended to determine the effect of noise stress on continuous listening performance by looking at 5 personality traits (neuroticism, extroversion, eagerness to gain new experiences, agreeableness, responsibility). This study is an interventional type, in which different levels of 65, 75 and 85 dB at a frequency of 1000 Hz were used as a stress factor. Methodology: The characteristics and personality traits of people participating in the project such as (neuroticism, extroversion, eagerness to gain new experiences, agreeableness and responsibility) were determined using the Neo Personality Questionnaire (NEO-FFI). From the Weinstein Questionnaire to determine sensitivity people to noise and annoyance scale according to ISO15666 standard was used to determine annoyance caused by noise. The subjects of the experimental groups were subjected to a continuous performance test using AX-CPT software after performing stressful cognitive tasks, which examined the percentage of attention and reaction time. Continuous performance indicators included the average number of correct and incorrect answers, omission error and average reaction time. Results : The comparison of the results of the continuous performance test in the face of noise stress showed that the average components related to continuous performance, people's sensitivity and annoyance caused by sound are different according to the characteristics of people's personality type, so that their average in There were more itroverts.The results showed that the personality traits of people have a significant effect on the level of sensitivity, irritation and continuous performance of people (Pvalue<0.05). The results of functional variables among people showed that there is a significant difference in the number of correct answers (Pvalue=0.001) and the number of incorrect answers (Pvalue=0.049). Also, the results of this research showed that stress leads to a significant increase in the average number of correct answers in extroverted people (Pvalue=0.018). The results of the research show that there is a significant relationship between the number of correct answers (Pvalue < 0.001) and incorrect answers (Pvalue = 0.049) with increasing the sound pressure level from 65 to 85 dB in the studied subjects. that the average number of correct answers decreases with increasing sound pressure level (due to the negative beta value) and the average number of incorrect answers increases (due to the positive beta value). This effect is different in people with different personality traits. Sound is more effective in introverts than extroverts that is, with an increase in sound from 65 to 85 dB, the performance of introverts and people sensitive to sound decreases more steeply than extroverts and people who are less sensitive to sound.