Different CCT provided by different lighting are important in affecting human beings psychologically and physiologically, as well as visual and non-visual processes. This study aim in finding out the effects of warm white (WW) light (CCT=2700K), cool white (CW) light (CCT=4000K) and artificial Daylight (CCT=6200K) on worker's alertness, visual comfort level, preferences and task performance. A repeated measure experimental study was conducted among 46 office workers under controlled environment. Alertness levels were measured by Karolinska Sleepiness Scale. Office Lighting Survey was used to evaluate visual comfort and preference. Typing speed and accuracy also were tested. Paired Sample T-Test was used and the results showed that there was significant reduction of subjective alertness level in WW light (p=0.001). In term of typing performances, subjects performed significantly better in term of typing speed under CW light and Daylight than WW light. Less typing errors were made under DL, followed by CW light. Meanwhile WW light lead to high typing errors. Besides, CW light is the most preferred whereas subjects feel most comfortable under Daylight. Subjects indicated that they can perform longer works in this coloured-lit environment. The CW light and DL light were more beneficial for office setting for computer-based task.
Practicing "OM" chanting has been reported to reduce stress levels and improve cognitive functions. Objective of the study was to observe beneficial effects of "OM" chanting on perceived stress and auditory and visual reaction time in private school teachers. 8 female school teachers of aged 27-40 years were part of this study after obtaining informed consent. Participants served as self-controls. After adequate training sessions, participants performed Om chanting once in a day at 6:00 am daily at meditation hall in school premises for 12 weeks under the supervision of yoga teacher. Perceived stress was recorded by using perceived stress scale. Auditory and visual reaction time was recorded by auditory and visual reaction time apparatus manufactured by Anand Agencies, Pune. We have observed significant decrease (P<0.05) in stress and significant improvement (P<0.05) in both auditory and visual reaction times in the participants followed by OM chanting. Our study provides further evidence for beneficial effects of OM chanting. We recommend Practicing OM chanting for better stress management and cognitive functions.
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