The sound of birds chirping in the morning, a babbling brook or crashing waves on the beach, or warm conversation with the ones you love. The experience of all these things requires the ability to hear. Arguably the most important sense for human communication, it is also the most commonly impaired of our senses. In this module, you will learn how the human ear is artfully designed to enhance our ability to hear the human voice. You will follow sound waves as they travel from the external world, to the eardrum, through the bones of the middle ear, and to the cochlea that transduces sound information into neural impulses.

The vestibular system and gaze control give us so much but are grossly under appreciated. They are so fundamental that we discount them, assuming that they will always be there. When the vestibular system fails us, its importance dominates our lives. Living with either a vestibular or an eye movement disorder is very disruptive to everyday life. In this module, you will learn how the inner ear is designed to detect and respond to head movements. You will learn about the circuit that connects the inner ear to the motoneurons that control the location of your eyes, allowing us to reflexively maintain our view of an object even as we move about in the world. Finally, we will talk about how you can modify this reflexive control of the eyes and how you can control where you are looking.

"Voluntary movements are how we interact with the world. The organization of the motor system has implications for how we move, and the types of movements we can make. This module we'll start to explore the organization of the motor system, from neurons to muscles. This module contains a lot of material, so be sure to start early so that you have time to finish!"

You should now have an understanding of how muscles function to initiate movements. However, the brain requires more than just the cerebral cortex to determine what movements to perform and to make those movements smooth and guided. This module, we'll explore the cerebellum and the basal ganglia, fascinating structures that play a major role in movement. You'll also learn how these brain regions are involved in motor learning and disease.

Although our bodies are very robust and we can live in a range of environments, our brain requires very specific conditions to function properly. Homeostasis is the active process by which our nervous system regulates internal conditions, such as blood pressure and temperature. This module we will explore what homeostasis does, and how it functions in everyday life.

You've now learned an incredible amount about the way the brain functions to perceive and act upon the world we live in. You've gained an understanding of neurobiology on a cellular level, and how many diseases and disorders of the nervous system can affect our bodies and minds. In our final module, we will journey into the realms of emotion, attention, memory, and language. By the end of this module, you will have a greater understanding of the more abstract cognitive functions the brain.