Impact of artificial colored lights on performance in working memory task.

Area of Science:

• Cognitive Neuroscience
• Environmental Psychology
• Ophthalmology

Background:

• Modern lifestyles involve constant exposure to artificial light with varying spectral compositions.
• Light wavelength (color) differentially stimulates retinal cone cells and influences non-image-forming pathways.
• Non-image-forming pathways are implicated in modulating cognitive functions, such as working memory.

Purpose of the Study:

• To evaluate the impact of specific colored light wavelengths on cognitive task performance.
• To investigate the effects of white, red, green, and blue light on working memory capacity.

Main Methods:

• A within-subject design was employed with 50 participants (mean age 28.8 years).
• Participants completed the Forward Digit Span Task (FDST) and Backward Digit Span Task (BDST) under four randomized light conditions (white, red, green, blue) after a 15-minute dark adaptation period.
• Performance was assessed using percent accuracy.

Main Results:

• Statistically significant differences in FDST and BDST performance were observed across different colored light exposures compared to white light (P < 0.0005).
• Performance on the FDST was consistently better than on the BDST across all light conditions.
• Working memory performance was significantly affected by light color, with red light yielding better performance than other colors.

Conclusions:

• The color of ambient light plays a crucial role in modulating cognitive performance, particularly working memory.
• Adjusting ambient light color is recommended when assessing cognitive functions.
• Red light may potentially enhance memory recall compared to blue and green light.