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According to the Text, What Was the Name of the Earliest

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According to the text, what was the name of the earliest theory used to explain the "collective mind" when people lose their individuality in crowds?


Definitions:

Natural Killer Cell

A type of lymphocyte in the immune system capable of killing certain infectious organisms and tumor cells without prior immunization.

Lyses Tumor

The breakdown or destruction of tumor cells, often through chemical, biological, or physical means.

Virus-infected Cells

Cells that have been invaded by viruses, which hijack the cells' machinery to replicate and produce more viruses.

Active Artificial Immunity

Immunity acquired through the introduction of a vaccine containing a harmless form of a pathogen, prompting an immune response without causing the disease.

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