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This article presents information regarding research on neuronal oscillations, electrical signals in the brain caused by the firing of neurons. The author comments on different types of oscillations, including alpha, beta, gamma, and delta waves, and details scientists' ideas as to their purpose in brain activity, particularly information processing.

The article deals with the existence of a natural sleep potion, a factor in the body fluids of an animal that induces sleep when it is injected to another animal, isolated and characterized by M. Monnier and G. A. Schoenenberger and colleagues at the University of Basel in Switzerland. The group called it sleep-factor delta, which promotes the production of delta waves or the slow brain waves characteristic of light sleep. Details of the experiment conducted by the group are presented.

The article discusses the importance of understanding brain waves in counseling clients. It explains the category and corresponding ranges measured in Hertz (Hz) of brain waves used in neurofeedback (NF) including delta, theta, alpha, and beta that used for the depth and accuracy to counseling. It notes that better diagnosis and conceptualization of the kind of treatment can be made through understanding the brains of counseling clients.