Abstract
The 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.
Highlights
The acute non-image forming (NIF) effects of daytime light on momentary mood had been- not always-established in the current literature
Negativity bias was identified as playing an important role in developing and maintaining major depressive disorder (MDD)[13,14], which describes the phenomenon whereby individuals selectively pay more attention to negative stimuli than neutral and positive s timuli[15,16] or are inclined to judge an ambiguous stimulus as n egative[17,18]
A main effect of correlated color temperature (CCT) was found on sleep duration (F (1,48) = 5.81, p = 0.02, R2pseudo = 0.05), with shorter total sleep time in the 6500 K condition (8.17 ± 0.16) than in the 2700 K condition (7.65 ± 0.15)
Summary
The acute non-image forming (NIF) effects of daytime light on momentary mood had been- not always-established in the current literature It still remains largely unknown whether short-time light exposure would modulate emotion perception in healthy adults. One study by Smolders and de Kort[26] revealed that participants felt significantly happier in 1000 lx vs 200 lx conditions (at eye level) after 30 min of light exposure, though participants’ feeling of sadness remained unaffected with light level. Smolders and de K ort[30] found that subjects felt less happy and sadder as assessed with a single 4-point item under high vs. low CCT (6000 K vs. 2700 K; 90 min) conditions
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