![]() After sitting at rest viewing a gray background for 60 s, participants viewed two images for 90 s. ![]() Forest and city (control) images were used as visual stimuli using a large plasma display window. The high-frequency (HF) component of HRV, which reflected parasympathetic nervous activity, and the ratio of low-frequency (LF) and high-frequency components (LF/HF), which reflected sympathetic nervous activity, were measured. Heart rate variability (HRV) was used as an indicator of autonomic nervous activity. As an indicator of brain activity, oxyhemoglobin (oxy-Hb) concentrations were measured in the left and right prefrontal cortex using near-infrared time-resolved spectroscopy. Seventeen female university students (mean age, 21.1 ± 1.0 years) participated in the study. ![]() This study was aimed to clarify the physiological effects of visual stimulation using forest imagery on activity of the brain and autonomic nervous system. ![]()
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