Theta Wave Brain Synchronization. This is a replication of a Theta wave entrainment rhythm first created by scientists in the 1960s to lull patients into a deep, colorful, creative dream state.
Listen to it for 10 minutes, longer if you can. The longer it plays, the deeper you’ll go. TestYourself by PsychTests. The Ten Most Revealing Psych Experiments. Psychology is the study of the human mind and mental processes in relation to human behaviors - human nature.
Due to its subject matter, psychology is not considered a 'hard' science, even though psychologists do experiment and publish their findings in respected journals. Some of the experiments psychologists have conducted over the years reveal things about the way we humans think and behave that we might not want to embrace, but which can at least help keep us humble.