What is Consciousness?

Examine a related theoretical construct - consciousness. The understanding of consciousness (what it is and how it occurs) has changed over time as neuroscience has advanced. For this discussion, research the theoretical construct of consciousness and respond to the following:

• Define consciousness.
• How might consciousness occur?
• Is consciousness purely a brain-based phenomenon, or might consciousness be something else? For example, is consciousness an example of a phenomenon where the "whole is greater than the sum of the individual parts"? Provide your rationale.