Light-Dependent Effects of Prefrontal rTMS on Emotional Working Memory

Area of Science:

• Neuroscience
• Cognitive Psychology
• Light Therapy

Background:

• Colored light affects brain functions, with blue light enhancing alertness and cognition.
• The interaction between light exposure and non-invasive brain stimulation, like repetitive transcranial magnetic stimulation (rTMS), is not well understood.
• Understanding these interactions is crucial for optimizing brain stimulation protocols.

Purpose of the Study:

• To investigate the impact of blue and green light exposure on the cognitive-emotional effects of prefrontal rTMS.
• To determine if light influences emotional working memory performance during rTMS.
• To explore the potential of colored light as an adjunctive technique for modulating brain activity.

Main Methods:

• A randomized within-subjects design was employed with 20 participants.
• Participants received active or sham rTMS over the right dorsolateral prefrontal cortex (DLPFC) under blue or green light conditions.
• An emotional working memory task (EMOBACK) with positive, negative, and neutral words was administered before and after each intervention.

Main Results:

• Light exposure significantly modulated the cognitive-emotional effects of rTMS.
• Task accuracy for positive stimuli improved under blue light conditions.
• Task accuracy for negative stimuli improved under green light conditions.

Conclusions:

• Colored light exposure influences the effectiveness of rTMS on emotional working memory.
• Blue light may enhance cognitive-emotional modulation for positive stimuli, while green light may do so for negative stimuli.
• Light exposure is an important factor to consider in non-invasive brain stimulation studies and may serve as an adjunctive therapy.