Individuals which would have such difficulties would most likely report that they're experiencing funcitonal fixedness - C. This is a phenomenon in which people cannot use certain tools for anything other than their official and proper use for which they were intended.
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The role and function of narcotics are for depressant and is typically used for severe pain. What these medications do is that they shut down the central nervous system which sends and perceives this sense of severe pain. Examples of narcotics include codeine and MORPHINE.