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Showing 5 results for Cognitive Performance
Evaluation of Effects of Different Levels of Brightness on Attention and Reaction Time under Laboratory Conditions
Habibollah Dehghan, Zohre Mohebian, Ghasem Yadegarfar,
Volume 4, Issue 4 (3-2017)
Abstract

Introduction: Few studies were conducted to determine the effects of lighting on cognitive performance. However, they could not reach a decisive conclusion. This study investigated cognitive performance of university students exposed to different levels of lighting under laboratory conditions.

Methods: In this experimental study, 33 subjects (age range 19-26 years) performed cognitive tests. Participants were exposed to three levels of lighting (200, 500 and 1500lux) in laboratory conditions while performing CPT tests to investigate percentage of attention and reaction time machine that measures reaction time.

Results: The results of this study showed that the maximum percentage of attention (99.75%) belonged to lighting of 1500 (lux) and the minimum percentage of attention was related to 500(lux) (99.36%). statistical analysis showed significant differences in percentage of attention in different levels of lighting (P=0.004). In addition, results of data analysis showed that increase in intensity of  lighting can make a significant change in the average response time (P˂0.001), correct response (P=0.004), commission error (P=0.001) and omission error (P=0.017). With increasing the lighting intensity, reaction time has decreased. The reaction time showed significant differences  at all levels of lighting (P˂0.001)

Conclusion: According to the findings of this study, lighting causes a decrease in reaction time and increase in attention. Thus, the lighting should be taken into account while designing of job and tasks which need attention or reaction time.


The Effects of Lighting on Mental and Cognitive Performance: A Structured Systematic Review
Rostam Golmohammadi, Mohsen Mehdinia, Reza Shahida, Ebrahim Darvishi,
Volume 5, Issue 2 (9-2017)
Abstract

Introduction: Lighting affects many non-visual functions such as Circadian rhythm, alertness, core body temperature, hormone secretion and sleep. The aim of this study was to investigate the effects of lighting on human cognitive and mental performance.
Methods: In this systematic review, databases including ISI Web of Knowledge, Scopus, PubMed and Science Direct were searched to access the relevant studies. The search was performed using the keywords "Lighting" and "Illumination" and "Cognitive Performance", "Mental Performance", "Memory ", "Attention", and "Concentration" by title, keyword and abstracts of articles published in mentioned databases from 2010 to 2016.
Results: Lighting affects human cognitive performance in three areas of psycho-cognitive (visual comfort, visual perception, color recognition, identification of symbols, attention, working memory, learning, reaction time and brain function), biocognitive area (alertness, mood, vitality, subjective feelings, motivation, well-being and quality of sleep) and mental workload (amount of workload, psychological stress, and mental fatigue). The best light to regulate cognitive, biological (circadian rhythm) and mental processes is bright daylight in the morning with a short wavelength (wavelength 420-480 nm) and high intensity (1000lx).
Conclusions: Lighting design in addition to providing comfort and visual needs should provide the non-visual and cognitive needs such as attention, alertness, mood, sleep quality and decrease mental fatigue and eventually well-bing.


Study of Daytime Lighting at Official Rooms and Its Relation with Personnel's Cognitive Performance, Alertness, Visual Comfort and Sleep Quality
Reza Shahidi, Rostam Golmohammadi, Zahra Pirmoradi Rizevandi, Azar Soltani, Nassrin Shirmohammadi Khoram, Reza Kazemi,
Volume 8, Issue 1 (5-2020)
Abstract

Background and Aim: Undesirable lighting at work environment causes visual and non-visual effects on employers. The aim of this study was to compare the quantity and quality of combined and artificial lighting in daytime and its relationship with the indexes of mental performance.
Methods: This study was carried out at 65 rooms and on 81 employees randomly selected from different clusters. Measurement of lighting parameters was done using a spectrometer. To assess the cognitive function, the Pshycomotor Vigiliance Task (PVT) test and for the sake of visual comfort, alertness and sleep quality, the Conlone, KSS (Karolinska Sleepiness Scale) and PSQI (Pittsburgh Sleep Quality Index) questionnaires were used respectively.
Results: Most artificial sources used in the rooms included fluorescent lights in different shapes and colors. The average indexes of combined lighting was more than artificial lightings (P<0.001). Visual comfort was correlated with high color temperature (P=0.006, r = 0.315). The employees with natural lighting had less visually impairment. The sleep quality of the subjects was related to the type of work environment lighting (Chi2=0.59, P=0.44). Alertness of subjects exposed to high color temperature or natural light was better at 8 and 11 hours. The results of cognitive performance test showed no significant difference between different lighting conditions.
Conclusion: Using natural light or artificial lights with adequate illuminance and high correlated color temperature can increase the alertness and visual comfort to some extent and improve the sleep quality of day staff employers.


Investigating the Effect of Environmental Thermal Comfort Components on Students' Cognitive Performance based on the Analysis of Fatigue Factor (Study Sample of Architecture Students of Universities in Ilam)
Hamed Ahmadi, Mojtaba Noorllahi, Mohmmad Reza Soleimani, Ehsan Bitaraf,
Volume 10, Issue 4 (3-2023)
Abstract
Objectives: Human-made environments can have negative and positive effects on the planet. One of the two-faceted artifacts is the construction of buildings for people's lives, buildings that are being built irregularly and quickly and lead to excessive consumption of fossil resources and energy waste. Become Therefore, one of the most important things in the design of a building is providing its thermal comfort; Comfort that has a direct effect on the cognitive function of humans. In this research, in addition to the topic of thermal comfort, we also discuss fatigue in the classroom, which is one of the factors influencing the cognitive performance of the students.
Methods: In this research, the cognitive performance of people were examined and compared in the range of thermal comfort and the suggested range of the Ashri standard. To investigate their performance in different temperature ranges, 220 architecture students of Ilam universities were selected by systematic random sampling method. The state of thermal comfort, cognitive functions, and fatigue of people was evaluated after measuring environmental factors through questionnaires and standard cognitive function software.
Results: In addition to thermal comfort, which has a direct relationship with the cognitive performance of students, the passage of time is not an exception to this rule, in other words, the cognitive performance of students is derived from thermal comfort and the passage of time, which has a direct effect on academic, mental productivity. and also their practical efficiency. After examining the data in this regard, we reached meaningful results that indicate the highest efficiency of the students in the conditions of proper thermal comfort and the first 60 minutes of the start of their performance.
Conclusion: The results of this research show that even if the thermal comfort of the students' classrooms is provided according to the ASHERI standard, the students' cognitive performance will decrease after 60 minutes from the start of the class.

A Study on the Status of Cognitive Failures and Their Relationship with Individual Factors and Personality Traits among Midwives Working in Kermanshah Province
Seyedeh Aghdas Hosseini, Zeynab Moradian Haft Cheshmeh, Fardin Zandsalimi, Mahsa Mashayekhi,
Volume 12, Issue 4 (2-2025)
Abstract
Background and aim: Cognitive failures are important for reducing accidents and improving performance and depend on multiple factors. Given that this issue has received less attention among midwives, this study aimed to determine the status of cognitive failures in relation to individual factors and personality traits among midwives.

Methods: This cross-sectional study was conducted in the summer of 2024 on 211 midwives working in Kermanshah province. The samples were selected using a convenience sampling method. A standard three-part questionnaire was used. The first part included demographic information. The second and third parts included questions from the Cognitive Failures Questionnaire and the short form of the NEO Personality Inventory, respectively. Data were analyzed using SPSS version 24.

Results: The mean age and work experience of the midwives participating in this study were 36.22 ± 8.03 years and 10.38 ± 7.85 years, respectively. The overall scores for cognitive failures in the dimensions of memory, action, and attention were 16.79 ± 3.04, 17.41 ± 2.80, and 16.30 ± 3.62, respectively. Results showed a direct relationship between age, work experience, and BMI with cognitive failures and an inverse relationship between exercising and cognitive failures. Neuroticism, agreeableness, and openness were directly related to cognitive failures, while conscientiousness was inversely related to cognitive failures.

Conclusion: The status of cognitive failures in the action dimension was more unfavorable compared to the other two dimensions. Some individual and personality traits were directly, and others inversely related to cognitive failures. Further studies in this area are necessary.
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