How does the presence of alpha react to eye opening?

The presence of alpha waves is significantly influenced by states of wakefulness and relaxation. When an individual opens their eyes and transitions from a state of relaxation or drowsiness into full wakefulness, alpha activity, which typically occurs when a person is alert but not actively engaged in mental tasks, tends to diminish. This occurs because alpha waves are associated with a calm, restful state often found with closed eyes, and opening the eyes typically increases alertness and engagement with the environment.

Neurophysiologically, this shift occurs because the brain's activity changes to facilitate sensory processing and engagement with visual stimuli, leading to a decrease in alpha frequency. Thus, the correct understanding of the relationship between alpha waves and eye opening reflects that alpha diminishes in response to the transition from a state of relaxation to active wakefulness.