There are two main theories that pertain to the role of the primary visual cortex (V1) in visual awareness. Hierarchical models propose that although V1 provides necessary input, only high-level ...

Learn the benefits and risks of options and how to start trading options Lucas Downey is the co-founder of MoneyFlows, and an Investopedia Academy instructor. Samantha (Sam) Silberstein, CFP®, CSLP®, ...