scholarly journals Effects of illuminance and correlated color temperature of indoor light on emotion perception

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yun Li ◽  
Taotao Ru ◽  
Qingwei Chen ◽  
Liu Qian ◽  
Xianghang Luo ◽  
...  
Keyword(s):  
Light Exposure ◽  
Emotion Perception ◽  
Judgment Task ◽  
Negativity Bias ◽  
Color Temperature ◽  
Light Spectrum ◽  
Oddball Task ◽  
The Face ◽  
Emotional Pictures ◽  
Emotional Face

AbstractThe acute non-image forming (NIF) effects of daytime light on momentary mood had been-although not always-established in the current literature. It still remains largely unknown whether short-time light exposure would modulate emotion perception in healthy adults. The current study (N = 48) was conducted to explore the effects of illuminance (100 lx vs. 1000 lx at eye level) and correlated color temperature (CCT, 2700 K vs. 6500 K) on explicit and implicit emotion perception that was assessed with emotional face judgment task and emotional oddball task respectively. Results showed that lower CCT significantly decreased negative response bias in the face judgment task, with labeling ambiguous faces less fearful under 2700 K vs. 6500 K condition. Moreover, participants responded slightly faster for emotional pictures under 6500 K vs. 2700 K condition, but no significant effect of illuminance or CCT on negativity bias was revealed in the emotional oddball task. These findings highlighted the differential role of illuminance and CCT in regulating instant emotion perception and suggested a task-dependent moderation of light spectrum on negativity bias.

Emotional working memory load selectively increases negativity bias

2020 ◽  
Author(s):  
Nicholas Harp ◽  
Michael D. Dodd ◽  
Maital Neta
Keyword(s):  
Memory Load ◽  
Response Competition ◽  
Negativity Bias ◽  
Cognitive Resources ◽  
Shared Resources ◽  
Domain Specific ◽  
Specific Effects ◽  
Competing Demands ◽  
The Face ◽  
Positive Valence

Cognitive resources are needed for successful executive functioning; when resources are limited due to competing demands, task performance is impaired. Although some tasks are accomplished with relatively few resources (e.g., judging trustworthiness and emotion in others), others are more complex. Specifically, in the face of emotional ambiguity (i.e., stimuli that do not convey a clear positive or negative meaning, such as a surprised facial expression), our decisions to approach or avoid appear to rely on the availability of top-down regulatory resources to overcome an initial negativity bias. Cognition-emotion interaction theories (e.g., dual competition) posit that emotion and executive processing rely on shared resources, suggesting that competing demands would hamper these regulatory responses towards emotional ambiguity. Here, we employed a 2x2 design to investigate the effects of load (low versus high) and domain (non-emotional vs. emotional) on evaluations of surprised faces. As predicted, there were domain-specific effects, such that categorizations of surprise were more negative for emotional than non-emotional loads. Consistent with prior work, low load (regardless of domain; i.e., domain-general) was associated with greater response competition on trials resulting in a positive categorization, showing that positive categorizations are characterized by an initial negativity. This effect was diminished under high load. These results lend insight into the resources supporting a positive valence bias by demonstrating that emotion-specific regulatory resources are important for overriding the initial negativity in response to emotional ambiguity. However, both domain-general and domain-specific loads impact the underlying processes.

Testing of photocatalytic potential of silver nanoparticles produced through nonthermal plasma reduction reaction and stabilized with saccharides

2021 ◽  
pp. 1-14
Author(s):  
N.U.H. Altaf ◽  
M.Y. Naz ◽  
S. Shukrullah ◽  
H.N. Bhatti
Keyword(s):  
Silver Nanoparticles ◽  
Band Gap ◽  
Light Exposure ◽  
Argon Plasma ◽  
Silver Ions ◽  
Reduction Reaction ◽  
Diameter Distribution ◽  
Light Spectrum ◽  
Plasma Reduction ◽  
Narrow Diameter Distribution

In this study, silver nanoparticles (AgNPs) were produced through an atmospheric pressure plasma reduction reaction and tested for photodegradation of methyl blue (MB) under sunlight exposure. The argon plasma born reactive species were used to reduce silver ions to AgNPs in the solution. Glucose, fructose and sucrose were also added in the solution to stabilize the growth process. The glucose stabilized reaction produced the smallest nanoparticles of 12 nm, while sucrose stabilized reaction produced relatively larger nanoparticles (14 nm). The nanoparticles exhibited rough morphology and narrow diameter distribution regardless of stabilizer type. The narrow diameter distribution and small band gap helped activating majority of nanoparticles at a single wavelength of light spectrum. The band gap energy of AgNPs varied from 2.22 eV to 2.41 eV, depending on the saccharide type. The photoluminescence spectroscopy of AgNPs produced emission peaks at 413 nm, 415 nm, and 418 nm. The photocatalytic potential of AgNP samples was checked by degrading MB dye under sunlight. The degradation reaction reached a saturation level of 98% after 60 min of light exposure.

scholarly journals The effects of short-term light exposure on subjective affect and comfort are dependent on the lighting time of day

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lijun Chen ◽  
Fang-Fang Yan ◽  
Shuhan Fan ◽  
Yifan Wu ◽  
Jia Yang ◽  
...  
Keyword(s):  
Significant Role ◽  
Negative Correlation ◽  
Significant Interaction ◽  
Daily Life ◽  
Light Exposure ◽  
Time Of Day ◽  
Color Temperature ◽  
Subjective Feeling ◽  
Short Term ◽  
Illuminance Level

AbstractLight, one of the key environmental components for both life and work, played significant role in subjective feelings (e.g. affect and comfort), but the exact effects and mechanisms were still to be determined. The present study screened thirty healthy adults (13 females, 22.45 ± 3.26 years) and examined subjective affect and comfort under short-term white lights with different combination of correlated color temperature (CCT) and illuminance at different times of day (e.g. morning, afternoon, and evening). Our results showed a significant interaction between illuminance level and time-of-day on subjective comfort. Participants felt more comfortable under 50 lx and 100 lx instead of 500 lx in the evening, and more comfortable under 500 lx in the morning and afternoon. In addition, a positive correlation between illuminance and comfort in the morning and a negative correlation between them in the evening were found. No significant effect of CCT on any subjective feeling was revealed. Our results necessitate the consideration of time-of-day in understanding lighting effects and application of healthy lighting in daily life.

scholarly journals Spectral Tuning of White Light Allows for Strong Reduction in Melatonin Suppression without Changing Illumination Level or Color Temperature

2018 ◽  
Vol 33 (4) ◽  
pp. 420-431 ◽  
Author(s):  
Jan L. Souman ◽  
Tobias Borra ◽  
Iris de Goijer ◽  
Luc J. M. Schlangen ◽  
Björn N. S. Vlaskamp ◽  
...  
Keyword(s):  
White Light ◽  
High Power ◽  
Spectral Power ◽  
Monochromatic Light ◽  
Action Spectrum ◽  
Color Temperature ◽  
Light Spectrum ◽  
Melatonin Suppression ◽  
Dim Light ◽  
Melatonin Production

Studies with monochromatic light stimuli have shown that the action spectrum for melatonin suppression exhibits its highest sensitivity at short wavelengths, around 460 to 480 nm. Other studies have demonstrated that filtering out the short wavelengths from white light reduces melatonin suppression. However, this filtering of short wavelengths was generally confounded with reduced light intensity and/or changes in color temperature. Moreover, it changed the appearance from white light to yellow/orange, rendering it unusable for many practical applications. Here, we show that selectively tuning a polychromatic white light spectrum, compensating for the reduction in spectral power between 450 and 500 nm by enhancing power at even shorter wavelengths, can produce greatly different effects on melatonin production, without changes in illuminance or color temperature. On different evenings, 15 participants were exposed to 3 h of white light with either low or high power between 450 and 500 nm, and the effects on salivary melatonin levels and alertness were compared with those during a dim light baseline. Exposure to the spectrum with low power between 450 and 500 nm, but high power at even shorter wavelengths, did not suppress melatonin compared with dim light, despite a large difference in illuminance (175 vs. <5 lux). In contrast, exposure to the spectrum with high power between 450 and 500 nm (also 175 lux) resulted in almost 50% melatonin suppression. For alertness, no significant differences between the 3 conditions were observed. These results open up new opportunities for lighting applications that allow for the use of electrical lighting without disturbance of melatonin production.

scholarly journals Impact of different standard lighting sources on red jadeite and color quality grading

2019 ◽  
Vol 23 (4) ◽  
pp. 371-378
Author(s):  
Xin Pan ◽  
Ying Guo ◽  
Ziyuan Liu ◽  
Zikai Zhang ◽  
Yuxiang Shi
Keyword(s):  
Light Source ◽  
Color Space ◽  
Sample Surface ◽  
Color Temperature ◽  
Integrating Sphere ◽  
Light Sources ◽  
Light Spectrum ◽  
Fisher Discriminant Analysis ◽  
Fisher Discriminant ◽  
Quality Grading

The purpose of this paper is to investigate the standard light source for grading and displaying the color of red jadeite and to classify the color. With Raman spectrometer, ultraviolet-visible spectrophotometer and X-ray fluorescence spectrometer, the results show that, the Fe 3+ is the main chromogenic mineral of red jadeite, which negatively correlates with the tonal angle, while the color of red jadeite has a positive correlation with the hematite content. The color of 120 red jadeite samples was examined by collecting the reflective signaled from the sample surface using an integrating sphere with the portable X-Rite SP62 spectrophotometer based on CIE 1976 L*a*b* uniform color space. The color parameters of jadeite samples under D65, A and CWF standard light sources were analyzed. The light spectrum of D65 light source is continuous, relatively smoothed with high color temperature, which makes the sample color close to that under the natural light and can be used as the best evaluation light source. A light source contributes to improve the red tone of jadeite, which is the best light source for commercial display of red jadeite. CWF light source can be used as the auxiliary lighting for color evaluation. The color of red jadeite is divided into five levels from best to worst using K-Means cluster analysis and Fisher discriminant analysis under D65 light source: Fancy Vivid, Fancy Deep, Fancy Intense, Fancy dark and Fancy.

Embodied Emotion Perception

2011 ◽  
Vol 2 (6) ◽  
pp. 673-678 ◽  
Author(s):  
David T. Neal ◽  
Tanya L. Chartrand
Keyword(s):  
Emotion Perception ◽  
Muscle Contractions ◽  
Dermal Filler ◽  
Facial Feedback ◽  
Cosmetic Procedure ◽  
Facial Emotions ◽  
Embodied Emotion ◽  
The Face ◽  
Source Of Information

How do we recognize the emotions other people are feeling? One source of information may be facial feedback signals generated when we automatically mimic the expressions displayed on others' faces. Supporting this “embodied emotion perception,” dampening (Experiment 1) and amplifying (Experiment 2) facial feedback signals, respectively, impaired and improved people’s ability to read others' facial emotions. In Experiment 1, emotion perception was significantly impaired in people who had received a cosmetic procedure that reduces muscular feedback from the face (Botox) compared to a procedure that does not reduce feedback (a dermal filler). Experiment 2 capitalized on the fact that feedback signals are enhanced when muscle contractions meet resistance. Accordingly, when the skin was made resistant to underlying muscle contractions via a restricting gel, emotion perception improved, and did so only for emotion judgments that theoretically could benefit from facial feedback.

The Cognitive Reality of Hierarchic Structure in Music

1989 ◽  
Vol 6 (4) ◽  
pp. 397-430 ◽  
Author(s):  
Mary Louise Serafine ◽  
Noah Glassman ◽  
Cornell Overbeeke
Keyword(s):  
Similarity Judgment ◽  
Judgment Task ◽  
The Third ◽  
Hierarchic Structure ◽  
The Face ◽  
Similarity Judgments ◽  
Type 3 ◽  
Better Than

Six experiments examined the cognitive reality of hierarchic structure in music. The first experiment showed that subjects were only moderately able to match a performed rendition of a hierarchic structure to the piece of music from which it was derived, with performance slightly better than chance. Metric accent emerged as a significant predictor of the tones perceived by subjects as structurally important. The second experiment showed that subjects' correct matchings were unlikely to be based on aesthetic preference, because performed renditions of (rule-governed) structures were not regarded as aesthetically preferable to nonstructures. The third experiment attempted to increase subjects' matching of structures and their original pieces through various task modifications, but these modifications did not increase performance over the success rate achieved in Experiment 1. Three additional experiments determined whether evidence of the distinction between structureand surface could be obtained in various similarity judgment tasks. Pairs of musical fragments were composed so that the members of each pair embodied (1) the same structure and same surface harmony, or (2) the same structure but different surface harmony, or (3) a different structure but same surface harmony. The rating task used in Experiments 4 and 5 showed that the members of Type-2 pairs of fragments were perceived to be just as similar as the members of Type-1 pairs, but Type-3 pairs were rated significantly lower in similarity. Thus, similarity judgments were based on underlying hierarchic structure, even in the face of radical harmony differences on the surface. This effect increased in strength with repeated hearing. The results support the cognitive reality of hierarchic structure, but are influenced by the type of perception used in a particular similarity judgment task and by the experience of repeated hearings.

scholarly journals Photodynamic therapy for correction of involutive facial skin changes

2021 ◽  
Vol 19 (3) ◽  
pp. 140-144
Author(s):  
S. I. Surkichin ◽  
N. V. Bochkova ◽  
L. S. Kholupova
Keyword(s):  
Photodynamic Therapy ◽  
Light Exposure ◽  
Transepidermal Water Loss ◽  
Coherent Radiation ◽  
Chlorin E6 ◽  
Skin Changes ◽  
Self Confidence ◽  
Photodamaged Skin ◽  
The Face ◽  
Group 2

Background.The appearance of the skin is of high social importance, largely determining the behavior and self-confidence of a person. The relevance of methods for the correction of involutive skin changes is growing every year. One modern treatment for photodamaged skin is photodynamic therapy. Objective:the study evaluated the effectiveness of photodynamic therapy using chlorin E6 as a photosensitizer for the correction of involutive changes in the skin of the face compared to using only light exposure. Methods.The study involved patients aged 4060 years with signs of involutive changes in the skin of the face. In group 1 (n=36), patients underwent therapy using only light coherent radiation. In group 2 (n=35), patients underwent PDT using light coherent radiation. Results.According to the results of elastometry, corneometry, assessment of transepidermal water loss, ultrasound examination of the skin in group2, more positive indicators were obtained than in group1. When assessing safety, the results in groups 1 and2 are comparable. Conclusions.The method of photodynamic therapy using chlorin E6 can be recommended for course use in wide clinical practice.

scholarly journals Colored Paints Containing NIR-Reflective Pigments Exposed to Accelerated Ultraviolet Radiation Aging with Possible Application as Roof Coatings

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1135
Author(s):  
Stefano Rossi ◽  
Hampus Lindmark ◽  
Michele Fedel
Keyword(s):  
Near Infrared ◽  
Light Exposure ◽  
Maximum Temperature ◽  
Potential Candidate ◽  
Light Spectrum ◽  
Ir Camera ◽  
Color Changes ◽  
The Difference ◽  
Steel Panels ◽  
The Stability

This study aims to evaluate the difference in thermal behavior among paints with the presence of traditional and NIR pigments by means of a simple and cheap laboratory-scale test. Considering these goals, the thermal and esthetical properties of two different cool coatings were assessed, highlighting their positive and limited aspects. Two different complex near-infrared inorganic reflective (NIR) pigments with yellow and black respectably colors were mixed in an acrylic waterborne copolymer binder. The paint formulations were applied on steel panels. The thermal performance of the coatings was investigated in the NIR-region of the light spectrum by exposing the samples to an IR-lamp. The outer and inner surface temperatures of the painted panels were recorded using thermocouples and an IR camera. The samples were aged by artificial UV-B light exposure. Color and specular gloss changes at different exposure times were evaluated. The behavior of the cool coatings was compared with that of conventional coatings with similar color characteristics. The black cool coating achieved a maximum temperature decrease, compared to the conventional black one, of approximately 12 °C. The stability for the cool coatings was very similar to that of the conventional coating, indicating that black pigment could be a potential candidate for cool-coating applications. The yellow cool coatings did not show a significant decrease in temperature compared to the conventional paint. The gloss and color changes resulted as influenced by the types and amount of pigments.

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