Brain Waves and Beta Buzz: The Wild Story of Neural Oscillations

What are brain waves?  It’s no wonder the term sounds like science fiction.  In the 1920s, a German psychiatrist embarked on a highly personal quest to discover the supposed medium of telepathy.  By placing electrodes on the human scalp, Hans Berger found waves of electrical brain activity using a tool called electroencephalography, or EEG.  Physicists had recently shown that electromagnetic waves could propagate through space to carry information.  If the brain had its own waves, could they transmit thoughts to others like a radio broadcast?Continue reading

How does the brain locate sound sources?

The brain has an amazing ability to identify the source of sounds around you. When driving, you can tell where an approaching fire truck is coming from and pull over accordingly. In the classic swimming pool game of “Marco Polo,” the player who is “it” swims toward the players who says “Polo.” In the field of neuroscience, this ability is called sound localization. Humans can locate the source of a sound with extreme precision (within 2 degrees of space)! This remarkable feat is accomplished by the brain’s ability to interpret the information from both ears. So how does your brain do it?Continue reading

The Auditory System: From Sound Waves to Brain Waves

Our human experience is enriched by our senses. The world would appear to be a dull place if the brain did not endow us with the ability to construct visual images, appreciate the complexity of a song, experience the touch of a loved one, and perceive the smells and tastes of our favorite foods. Each of these sensory modalities (vision, hearing, touch, smell, and taste) is incredibly complex, requiring specialized structures working in sync with interconnected network of neural circuits. Together, they allow for a rich experience of the world.Continue reading