In this second module (MCB80x.2) we will explore how neurons communicate with each other.  We will investigate the collective behavior of neurons in small circuits and ways in which signals between neurons are modulated. Each lesson will be media and content rich and will challenge you to master material with interactive segments that depend on your feedback to move forward in the lesson. You will be able to use virtual labs simulating neurons and circuitry to test your understanding of the course material. Lessons will also be filled with beautiful animations, exploring the richness and complexity of the brain. Documentaries focusing on cutting-edge topics in neuroscience will take you inside labs, hospitals and research institutions around Harvard, MIT and Boston, and quiz banks will allow you to test your knowledge on your own time. Our forums will provide you with a place to meet other students around the world.  You can learn from each other as well as discuss questions with members of our team during office hours, which will be held every Wednesday. Lesson 1: The Synapse (released 9/03/14 2pm EST) Lesson 2: Excitation & Inhibition (released 9/07/14 2pm EST) Lesson 3: Small Circuits (released 10/01/14 2pm EST) Lesson 4: Neuromodulation (released 10/15/14 2pm EST) Lesson 5: Potentiation & Depression (released 10/29/14 2pm EST)