According to a 2004 research, the sense of smell is a complicated process.
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Certain smells that are associated in our minds to events or locations from the past, trigger our memories to revisit them. This association of the past through the sense of smell works better and is more vivid than the sense of touch or sight.
Example: Smelling the pages of a new book may remind us of late-night reading as a kid.
Recent studies suggest we employ the same neurophysiological mechanisms while dreaming that we use to construct and recall memories while we are awake.
Studies also found that vivid, bizarre and emotionally intense dreams are linked to parts of the amygdala and hippocampus. The amygdala plays a key role in processing and memory of emotional reactions. The hippocampus is implicated in important memory functions, such as the consolidation of information from short-term to long-term memory.
The whole brain can be considered an NCC because it generates experience continually.