Mental Acuity

Heart rate variability (HRV) is a key indicator of fitness, and stress resilience. Previous research has shown that HRV decreases under mental workload, including during tasks that require strict attention. Studies also show that temperature exposure affects attention: cold increases the stress response while warm water has a calming effect. Very few studies combine thermal exposure with cognitive testing, and no controlled trials have investigated whether water temperature modulates HRV responses specifically during cognitive demand.

College students face substantial and persistent mental health challenges that directly affect cognitive performance, stress regulation, and emotional well-being. Neurological functions such as working memory, attention regulation, executive control, and emotional processing are highly sensitive to stressors, leaving young adults vulnerable to daily fluctuations in cognitive efficiency. Recent findings from the Healthy Minds Network (2025) indicate that although rates of moderate to severe depression among college students declined from 44% in 2022 to 37% in 2025, and anxiety symptoms fell from 37% to 32%, levels of psychological flourishing also dropped, falling to 36% despite these improvements. Ginseng contains bioactive compounds known as ginsenosides that favorably influence brain function and inflammatory cascades. Studies in stressed and moderately stressed adults demonstrated reduced perceived stress, improved emotional processing, enhanced cognitive performance, and beneficial changes to biomarkers with ginseng supplementation. In addition, randomized controlled trials reported improvements in mood regulation, fatigue resistance, and aspects of working memory and attention following short-term ginseng supplementation. This study will examine the effects of daily red panax ginseng supplementation (3000 mg/day; two 1500 mg Red Panax gummies) on cognitive performance and emotional well-being in healthy young adults.

Spirulina platensis is a form of cyanobacteria, a blue-green algae, and is a superfood most known for being rich in protein, vitamins and minerals, and healthful phytochemicals. Spirulina supports brain health through neuroprotection offered by its antioxidants, anti-inflammatory properties, and hormone regulation. The aim of this study is to supplement healthy adults from a campus community with 3g of spirulina, daily, for 8 weeks to improve mood and mental acuity in comparison to receiving a placebo.