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Smell is often described as a direct route to memory, yet its journey through the body is more complex (9) .......... it first appears. Air carries tiny particles which enter the nose and interact (10) .......... specialised cells.
The brain (11) .......... not simply record these signals; it compares them with earlier experiences and with the setting in which they occur. (12) .......... familiar a scent may be, it can seem comforting in one situation and unwelcome in another.
This is why (13) .......... ordinary smell from a kitchen can feel stronger after a long day. Scientists are interested (14) .......... whether people can learn to identify particular ingredients, but they also study the role of expectation. What we think we are about to smell can influence (15) .......... we notice, sometimes more (16) .......... the chemical difference itself.