scholarly journals Effect of Lighting Illuminance and Color Temperature on Mental Workload in Office Setting

2021 ◽  
Author(s):  
Jiayi Bao ◽  
Xinbo Song ◽  
Yan Li ◽  
Yinjie Bai ◽  
Qianxiang Zhou
Keyword(s):  
Mental Workload ◽  
Physiological Responses ◽  
Event Related Potentials ◽  
Color Temperature ◽  
Oddball Paradigm ◽  
Experimental Task ◽  
Office Setting ◽  
Office Environment ◽  
Lighting Conditions ◽  
Related Potentials

Abstract The mental workload of subjects was tested in different lighting conditions, with color temperature ranging from 3000K to 6500K and illuminance 300 lx to 1000 lx. We used both psychological and physiological responses for evaluation. The former was based on the NASA-TLX scores, and the latter was based on EEG P3b analysis of event-related potentials with the “oddball” paradigm experimental task. Results show that the P3b amplitudes are significantly affected by color temperature (P = 0.009) and illuminance (P = 0.038) levels. Office environment with 3000K color temperature and 750 lx illumination, which exerts the lowest mental workload, is the most suitable for working. However, the interaction between color temperature and illuminance in affecting the mental workload of participants is not clear. This work provides more appropriate lighting choices with color temperature and illuminance in order to reduce people’s mental workload in office setting.

scholarly journals Effect of lighting illuminance and colour temperature on mental workload in an office setting

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jiayi Bao ◽  
Xinbo Song ◽  
Yan Li ◽  
Yinjie Bai ◽  
Qianxiang Zhou
Keyword(s):  
Response Time ◽  
Mental Workload ◽  
Event Related Potentials ◽  
Error Rates ◽  
Oddball Paradigm ◽  
Colour Temperature ◽  
Task Load ◽  
Subjective Scale ◽  
Related Potentials ◽  
Nasa Task Load Index

AbstractThe mental workload of subjects was tested under different lighting conditions, with colour temperatures ranging from 3000 to 6500 K and illuminance ranging from 300 to 1000 lx. We used both psychological and physiological responses for evaluation. The former was based on NASA Task Load Index (NASA-TLX, NASA), and the latter was based on the electroencephalogram (EEG) P3b analysis of event-related potentials using the “oddball” paradigm experimental task. The results show that as illuminance increases, and the response time becomes longer with a colour temperature of 3000 K (P < 0.01). However, when the colour temperature is set at 6500 K, the response time becomes shorter as the illuminance increases (P < 0.01). P3b amplitudes were significantly affected by colour temperature (P = 0.009) and illuminance (P = 0.038) levels. The highest amplitudes occurred at 3000 K and 750 lx, which is consistent with the trend shown by the subjective scale. The data analysis of error rates is not significant. These results suggest that an office environment with a colour temperature of 3000 K and illumination of 750 lx, which exerts the lowest mental workload, is the most suitable for working. However, the interaction between colour temperature and illuminance in affecting the mental workload of participants is not clear. This work provides more appropriate lighting choices with colour temperature and illuminance to reduce people’s mental workload in office settings.

EEG Measurement of Emotion Processing in Children with Daytime Urinary Incontinence

2018 ◽  
Vol 46 (4) ◽  
pp. 336-341
Author(s):  
Justine Niemczyk ◽  
Monika Equit ◽  
Katja Rieck ◽  
Mathias Rubly ◽  
Catharina Wagner ◽  
...  
Keyword(s):  
Urinary Incontinence ◽  
Patient Group ◽  
Imaging Techniques ◽  
Emotion Processing ◽  
Event Related Potentials ◽  
Oddball Paradigm ◽  
Control Group ◽  
Central Processing ◽  
Daytime Urinary Incontinence ◽  
Related Potentials

Abstract. Objective: Daytime urinary incontinence (DUI) is common in childhood. The aim of the study was to neurophysiologically analyse the central emotion processing in children with DUI. Method: In 20 children with DUI (mean age 8.1 years, 55 % male) and 20 controls (mean age 9.1 years, 75 % male) visual event-related potentials (ERPs) were recorded after presenting emotionally valent (80 neutral, 40 positive, and 40 negative) pictures from the International Affective Picture System (IAPS) as an oddball-paradigm. All children received a full organic and psychiatric assessment. Results: Children with DUI did not differ significantly from controls regarding responses to emotional pictures in the frontal, central, and parietal regions and in the time intervals 250–450 ms, 450–650 ms, and 650–850 ms after stimulus onset. The patient group had more psychological symptoms and psychiatric comorbidities than the control group. Conclusions: EEG responses to emotional stimuli are not altered in children with DUI. Central emotion processing does not play a major role in DUI. Further research, including a larger sample size, a more homogeneous patient group (regarding subtype of DUI) or brain imaging techniques, could reveal more about the central processing in DUI.

Age does not necessarily influence latency of event-related potentials

2014 ◽  
Vol 33 (10) ◽  
pp. 723-727
Author(s):  
M. Westermann ◽  
I. W. Husstedt ◽  
A. Okegwo ◽  
S. Evers
Keyword(s):  
Normal Values ◽  
Rank Correlation ◽  
Event Related Potentials ◽  
Intrinsic Property ◽  
Total Sample ◽  
Oddball Paradigm ◽  
Age Dependent ◽  
Related Potentials ◽  
The Mean ◽  
P3 Component

SummaryEvent-related potentials (ERP) are regarded as age dependent. However, it is not known whether this is an intrinsic property of ERP or an extrinsic factor. We designed a setting in which ERP were evoked using a modified oddball paradigm with highly differentiable and detectable target and non-target stimuli. A total of 98 probands were enrolled in this study. We evaluated the latency and amplitude of the P3 component of visually evoked ERP. The mean P3 latency was 294 ± 28 ms and was not related to age (r = –0.089; p = 0.382; Spearman-rank-correlation). The P3 amplitude was related to age in the total sample (r = –0.323; p = 0.001; Spearmanrank-correlation) but not in the probands under the age of 60 years. There were no significant differences regarding sex. Our findings suggest that ERP are not age dependent if highly differentiable and detectable stimuli are used. This should be considered when normal values of ERP are created for clinical use.

Implicit need for affiliation and processing of emotional images: Event-related potential correlates

2018 ◽  
Vol 46 (2) ◽  
pp. 273-280
Author(s):  
Jianfeng Wang ◽  
Yan Wu ◽  
Lushi Jing
Keyword(s):  
Cognitive Processes ◽  
Event Related Potentials ◽  
Event Related Potential ◽  
Oddball Paradigm ◽  
Emotional Information ◽  
Need For Affiliation ◽  
Additional Information ◽  
Negative Images ◽  
Related Potentials ◽  
Emotional Information Processing

Implicit motives play an important role in the regulation of many basic cognitive processes, particularly in the stage of attention. We conducted a study with a sample of 58 college students to examine selective attention to emotional stimuli as a function of individual differences in the implicit need for affiliation (nAff). In an affective oddball paradigm, event-related potentials were recorded while participants viewed positive, neutral, and negative images of people. Results showed that individuals high in nAff elicited larger late positive potential amplitudes to negative images than those low in nAff did. These findings replicate and extend the results of a previous study focused on these relationships and provide additional information on the neural correlates of affiliation-related emotional information processing.

Saliency of Vowel Features in Neural Responses of Cochlear Implant Users

2018 ◽  
Vol 49 (6) ◽  
pp. 388-397
Author(s):  
François Prévost ◽  
Alexandre Lehmann
Keyword(s):  
Speech Recognition ◽  
Cochlear Implant ◽  
Fundamental Frequency ◽  
Mismatch Negativity ◽  
Free Field ◽  
Event Related Potentials ◽  
Oddball Paradigm ◽  
Aural Rehabilitation ◽  
Spectral Components ◽  
Related Potentials

Cochlear implants restore hearing in deaf individuals, but speech perception remains challenging. Poor discrimination of spectral components is thought to account for limitations of speech recognition in cochlear implant users. We investigated how combined variations of spectral components along two orthogonal dimensions can maximize neural discrimination between two vowels, as measured by mismatch negativity. Adult cochlear implant users and matched normal-hearing listeners underwent electroencephalographic event-related potentials recordings in an optimum-1 oddball paradigm. A standard /a/ vowel was delivered in an acoustic free field along with stimuli having a deviant fundamental frequency (+3 and +6 semitones), a deviant first formant making it a /i/ vowel or combined deviant fundamental frequency and first formant (+3 and +6 semitones /i/ vowels). Speech recognition was assessed with a word repetition task. An analysis of variance between both amplitude and latency of mismatch negativity elicited by each deviant vowel was performed. The strength of correlations between these parameters of mismatch negativity and speech recognition as well as participants’ age was assessed. Amplitude of mismatch negativity was weaker in cochlear implant users but was maximized by variations of vowels’ first formant. Latency of mismatch negativity was later in cochlear implant users and was particularly extended by variations of the fundamental frequency. Speech recognition correlated with parameters of mismatch negativity elicited by the specific variation of the first formant. This nonlinear effect of acoustic parameters on neural discrimination of vowels has implications for implant processor programming and aural rehabilitation.

Comparison of attentional resource allocation to threat and selfrelevant information: An event-related potentials study

2021 ◽  
Vol 49 (3) ◽  
pp. 1-11
Author(s):  
Guan Wang ◽  
Yuting Liu ◽  
Yuan Fang
Keyword(s):  
Resource Allocation ◽  
Event Related Potentials ◽  
The Body ◽  
Attentional Resource ◽  
P300 Amplitude ◽  
Oddball Paradigm ◽  
Cognitive Resources ◽  
Computer Screen ◽  
Related Potentials ◽  
Information Type

Although previous researchers have shown that attention is preferentially allocated during situations involving both threat and selfrelevant information, it is unclear which information type requires more cognitive resources. We compared the automatic processing of threat and self-relevant stimuli using the no-report oddball paradigm. Participants looked at images on a computer screen that displayed fighting with opponents or interacting with friends or customers. The body action of the person depicted was performed either toward the viewing participant or toward other people. Participants watched without making an explicit response, and event-related potentials were measured with electroencephalography. We found that threat (vs. selfrelevant) information elicited a larger P300 amplitude, and for nonthreatening events the P300 amplitude was larger for self-relevant than other-relevant stimuli. These results indicate that threat (vs. selfrelevant) information demands more cognitive resources, possibly because people prioritize survival.

Auditory event-related potentials, neurocognition, and global functioning in drug naïve first-episode schizophrenia and bipolar disorder

2021 ◽  
pp. 1-10
Author(s):  
Xiaojing Li ◽  
Wei Deng ◽  
Rui Xue ◽  
Qiang Wang ◽  
Hongyan Ren ◽  
...  
Keyword(s):  
Bipolar Disorder ◽  
Rating Scale ◽  
Event Related Potentials ◽  
Event Related Potential ◽  
First Episode ◽  
Oddball Paradigm ◽  
Global Functioning ◽  
Adult Intelligence Scale ◽  
Related Potentials ◽  
Drug Naïve

Abstract Background Deficits in event-related potential (ERP) including duration mismatch negativity (MMN) and P3a have been demonstrated widely in chronic schizophrenia (SZ) but inconsistent findings were reported in first-episode patients. Psychotropic medications and diagnosis might contribute to different findings on MMN/P3a ERP in first-episode patients. The present study examined MMN and P3a in first episode drug naïve SZ and bipolar disorder (BPD) patients and explored the relationships among ERPs, neurocognition and global functioning. Methods Twenty SZ, 24 BPD and 49 age and sex-matched healthy controls were enrolled in this study. Data of clinical symptoms [Positive and Negative Symptoms Scale (PANSS), Young Manic Rating Scale (YMRS), Hamilton Depression Rating Scale (HAMD)], neurocognition [Wechsler Adult Intelligence Scale (WAIS), Cattell's Culture Fair Intelligence Test (CCFT), Delay Matching to Sample (DMS), Rapid Visual Information Processing (RVP)], and functioning [Functioning Assessment Short Test (FAST)] were collected. P3a and MMN were elicited using a passive auditory oddball paradigm. Results Significant MMN and P3a deficits and impaired neurocognition were found in both SZ and BPD patients. In SZ, MMN was significantly correlated with FAST (r = 0.48) and CCFT (r = −0.31). In BPD, MMN was significantly correlated with DMS (r = −0.54). For P3a, RVP and FAST scores were significant predictors in SZ, whereas RVP, WAIS and FAST were significant predictors in BPD. Conclusions The present study found deficits in MMN, P3a, neurocognition in drug naïve SZ and BPD patients. These deficits appeared to link with levels of higher-order cognition and functioning.

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