Why Does a Word Sometimes Lose All Meaning?

You may have experienced this before: When you repeat the same word over and over and over and over and over and over and over and over and over and over and over and over, the words suddenly sound foreign and lose all meaning, but why?

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Sources:Sources:
http://psycnet.apa.org/index.cfm?fa=buy.optionToBuy&id=1991-06459-001
http://www.affective-science.org/pubs/2012/gendron-et-al-2012.pdf
https://books.google.co.uk/books?id=tjfTGePcVzsC&pg=PA63

Image Sources
https://commons.wikimedia.org/wiki/Category:Edward_Titchener#/media/File:Edward_Bradford_Titchener.jpg